JPH10144010A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To verify whether data writing is correctly performed while preventing a writing time from being extended. SOLUTION: A verification memory 23 controlled by a CPU 11 is provided. After power ON, or only at the time of first writing after disk loading, specified data is stored in a memory 23A and transferred to a DRAM 14 and, then, by a disk drive 25, the data is written in the specified area of a magneto-optical disk. The written data is reproduced, stored in the DRAM 14 and further stored in a memory 23B. Detection is made as to coincidence in contents between the memories 23A and 23B and if non-coincidence is detected, then a first alarm display is made by a display 9 and writing is performed again. IF content non- coincidence between the memories 23A and 23B is detected during the second round of writing, a second alarm display is made by the display 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for recording digital data on a magneto-optical disk, for example.

[0002]

2. Description of the Related Art A magneto-optical disk having a diameter of 64 mm housed in a cartridge has been proposed as one type of magneto-optical disk. This magneto-optical disk has an M
Also known as D (minidisc). Digital data other than audio data can be recorded on this magneto-optical disk. Such disks are
It is called MD DATA, and its specifications are standardized. Further, Picture MD is standardized as an extension of MD DATA. In the picture MD, for example, a video signal based on an image pickup signal is digitized and, for example, a JPEG (Joint Photographic Experts
Up) It is possible to record a digital signal compressed by image compression. The JPEG method uses DCT (Di
This is a method for compressing still image data by using a "screte CosineTransform" and a variable length code. In the JPEG system, color still image data can be compressed to 1/8 to 1/100.
When still image data compressed by the JPEG system is recorded on a magneto-optical disk similar to an MD, 30 disks can be recorded on one disk.
About 0 still image data can be recorded.

Normally, in a disk device such as a floppy disk, confirmation of written data (referred to as verification) can be set to either ON or OFF, and a user can select whether to perform data verification or not. Select and perform a write operation. In this case, when the verify operation is OFF, when the write operation becomes unstable, it cannot be guaranteed that the data is correctly written, and it is noticed that the correct write was not performed for the first time when the written data is used after a long time. Will be. In the verify-ON mode, every time data is written in a predetermined unit, the written data is read and confirmed, so that a rotation wait occurs and writing takes time.

In a recorder using the above-mentioned MD, data is recorded / reproduced in recording units called clusters. In the case of MD, since the data amount of audio data is compressed to about 4.5 times, unlike CD, data is intermittently recorded / reproduced. One cluster is composed of 36 sectors.
The sector is 13.3 ms in terms of time, and the time of one cluster is 478.8 ms (about 0.5 seconds). When verifying, after writing one cluster, this one cluster is reproduced, and the reproduced data and the recorded data are collated. As a result, when verification is performed, double disk tracing time is required for writing and reading, and an access time for rereading the written data is also required.

[0005] Since the MD is a CLV (constant linear velocity) disc, like a CAV (constant angular velocity) disc,
One rotation does not correspond to the data unit, it takes time to access the original position compared to the CAV disk,
Of course, as described above, twice the trace time is required. Therefore, in the MD recorder, data verification is not performed in order to avoid an increase in the writing time.

Further, in the MD recorder, when a shock is applied at the time of recording / reproduction, in order to prevent sound skipping,
Has memory. When a shock is applied, the pickup is quickly returned to the original position, and the data stored in the memory is written. The vacant time caused by the data compression is used as a margin for preventing sound skipping at the time of writing, and the effect of sound skipping prevention is reduced by reducing the vacant time. From this point, no verification has been done.

[0007]

As described above, the MD
The recorder does not verify the data. Therefore, it is not known that the writing of data has become unstable due to the deterioration of the writing laser output or the contamination of the disk. In some cases, an unstable write can corrupt valid data. Recovery of corrupted data was difficult.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a disk device such as an MD recorder which can perform verification while preventing a long time when data is written.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to a disk drive for recording data on a disk-shaped recording medium. A pickup unit for reading data from the recording medium, a recording processing unit for supplying write data and generating data supplied to the pickup unit, a first memory for storing the write data, and a pickup unit Reproduction processing means to which read data is supplied, second memory for storing reproduction data from the reproduction means, contents of the first and second memories only at the time of first writing or first reading And a means for performing a verify operation by comparing.
When the contents of the first and second memories do not match, a warning is generated to inform that writing is unstable. Further, when the contents of the first and second memories do not match, the write data stored in the first memory is rewritten, the rewritten data is reproduced and stored in the second memory, Verification is performed by comparing the contents of the first and second memories.

At the time of first writing, write data is stored in the first memory, and the write data is written in a predetermined area of the disk-shaped recording medium. The written data is reproduced from the disk-shaped recording medium and read into the second memory. The contents of these first and second memories are compared. If they do not match, it is determined that writing is unstable. If the contents of the two memories do not match at the first write, the write data stored in the first memory is written again.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a digital still image video signal is compressed by the JPEG method and recorded on a magneto-optical disk similar to an MD (mini disk). In FIG. 1, a video input terminal denoted by 1 is supplied with a video signal (still image video signal) from a source such as an electronic still camera, a scanner, a video camera, and a television broadcast. An electronic album can be created by capturing images with a scanner. In addition, an audio signal (narration, BGM, and the like related to a still image) related to the video signal is supplied to an audio input terminal 19 described later.

An input video signal is supplied to an A / D converter 2. The A / D converter 2 digitizes the still image video signal. As an example, a digital image (standard image) of (640 pixels × 480 lines) is generated by sampling with a square lattice. The output of the A / D converter 2 is supplied to the video signal processing circuit 3. The video signal processing circuit 3 causes the luminance signal Y and the color difference signals RY, B
A component video signal consisting of -Y is formed.
The component video signal is, for example, in the format of (4: 2: 0). The video signal processing circuit 3 performs signal processing such as gamma correction, aperture correction, and shading processing.

A video signal from the video signal processing circuit 3 is supplied to an image memory (V
(RAM) 5. And this image memory 5
Is supplied to the D / A converter 6 under the control of the memory controller 4. The D / A converter 6 converts the digital video signal into an analog video signal.

The output of the D / A converter 6 is supplied to a video signal processing circuit 7. The output of the video signal processing circuit 7 is supplied to the display 9 via the display driver 8.
As the display 9, a liquid crystal display, a CRT monitor, or the like can be used. In the video signal processing circuit 7, for example, a composite video signal of the NTSC system is formed, and this composite video signal is output from the video signal output terminal 10.

The digital video signal taken into the image memory 5 is supplied to an image compression / decompression circuit 13 via a CPU bus 12. Image compression / decompression circuit 13
Converts a digital video signal (still image signal) into, for example, JP
The compression / expansion is performed using the EG method. JPEG
The system compresses the digital video signal by performing DCT conversion on the digital video signal and performing variable length coding.

The video signal from the image memory 5 is compressed by the image compression / decompression circuit 13 according to the JPEG system. The compressed video signal is temporarily stored in the DRAM 14 via the CPU bus 12. When a save command is issued from the CPU 11, the data from the DRAM 14 is transferred to the disk drive 25 via the interface 24.
And recorded on a magneto-optical disk. The disk drive 25 will be described later.

The CPU 11 records the entire system, such as processing for compressing an input video signal and recording it on a magneto-optical disk, and processing for expanding and reproducing a signal reproduced from the magneto-optical disk. / Playback processing is being performed. A CPU bus 12 is derived from the CPU 11. For the CPU bus 12, the memory controller 4,
Image compression / decompression circuit 13, DRAM 14, ROM 15,
A RAM 16, a key 17, an audio compression / expansion circuit 18, an interface 19, and a memory 23 are connected.

The keys 17 include a power key, an eject key, a play key, a pause key, a stop key, a music selection key, a recording key, and the like. Also, the display 9
In addition to still images, time information such as the total playback time of the disc, the elapsed time of the program being played, the remaining playback time of the program being played, the total remaining playback time, etc., and the track number of the program being played back, etc. Is displayed. Further, for a disc on which a disc name and a track name are recorded, the display 9 displays such information. Further, if the recording date is recorded on the disc, the recording date is displayed on the display 9.

Still further, by recording file management data for managing video data and audio data on a disc, narration reproduction for listening to explanations related to images and BGM for long-time music reproduction are performed. Reproduction becomes possible. Furthermore, character data and pattern data can be combined with video data, and video data in which the character data and pattern data have been combined can be recorded.

The audio compression / expansion circuit 18 has an input terminal 1
The A / D converter 20 converts the analog audio signal from the digital audio signal 9 into a digital signal and supplies the digital signal. Also,
The audio signal from the audio compression / expansion circuit 18 is D / A
The signal is extracted by the converter 21 to the output terminal 22 as an analog audio signal. The audio compression / decompression circuit 18
This adopts the same compression coding (called ATRAC) as D.

The memory 23 includes a first memory 23A and a second memory 23B. This memory 23
Is provided for performing verification at the time of writing, as described later. The memory 23 may be configured by using a part of the DRAM 14 or the RAM 16.
It may be provided in the disk drive 25 together with another CPU.

FIG. 2 shows an example of the disk drive 25. In FIG. 2, reference numeral 31 denotes a magneto-optical disk,
Like D, it has a diameter of 64 mm and is housed in a cartridge 32. When the magneto-optical disk 31 is mounted,
The shutter provided on the cartridge is opened. The magneto-optical disk 31 is rotated by a spindle motor 33. A magnetic head 34 for recording is arranged above the magneto-optical disk 31 so as to face the same, and an optical pickup 35 is arranged below the magnetic head 34 so as to face the same. The optical pickup 35 and the magnetic head 34 can be moved in the radial direction of the disk by a feed motor 36.

The servo control circuit 37 controls the two-axis device of the optical pickup 35 based on the focus error signal and the tracking error signal generated by the RF circuit 38, and performs focus and tracking control. Control. Also, the spindle motor 33 is controlled by the servo control circuit 37.
Is controlled.

The DRAM 1 via the interface 24
The compressed video data captured from 4
Encoded by the encoder 39. Encoder 39
Are EFM (8-14 modulation) and CIRC (Cross In)
terleave Reed Solomon Code) processing. That is, error correction coding is performed by CIRC,
The encoded data is modulated by the EFM method. Encoder 3
9 is output to the magnetic head 3 via the head drive circuit 40.
4 is supplied. Then, a laser beam from the optical pickup 35 is applied to the magneto-optical disk 31, and a modulated magnetic field from the magnetic head 34 is applied to the magnetic disk 31. Thereby, the recording data is recorded by the magneto-optical method.

At the time of recording, the video signal stored in the image memory 5 is supplied to a D / A converter 6. D
The output of the / A converter 6 is supplied to the video signal processing circuit 7. The output of the video signal processing circuit 7 is the display driver 8
Is supplied to the display 9 via the. As a result, the screen that is being recorded is displayed on the display 9.

Data recording is performed intermittently in cluster units, similarly to MD. One cluster is 36 sectors, and one sector (corresponding to one subcode block of a compact disc) is a 5.5 sound group. 32 sectors in one actual cluster are valid data. The remaining four sectors are used as a linking area for adjusting the timing of the rise of the magnetic field of the magnetic head at the start of recording and the control of the laser power.

The recordable data amount in one sector is 2 KB
(Kilobytes), and the recordable data amount in one cluster is 64 KB. A standard digital still image (640 × 480) (standard image) is compressed by JPEG to have a data amount of 64 KB or 128 KB. When compressed to 64 KB, one cluster corresponds to one still image. When compressed to 128 KB, one still image is recorded as two clusters. As a result, 1
Up to 2000 still images can be recorded on one magneto-optical disk. However, in a mode in which still images and music are mixed, it is possible to record 365 to 730 standard images, and to record music in stereo for 40 minutes.

The position on the disk at the time of recording is specified by the address recorded in the groove provided along the track of the magneto-optical disk 31 by wobble recording.
This address is detected by an address decoder 41 connected to the RF amplifier 38. Address decoder 41
Is supplied to the decoder 42. The address information generated in the decoder 42 is transmitted to the CPU 11 via the interface 24 and the CPU bus 12.
Is transmitted to

The write data is stored once in the DRAM 14. The DRAM 14 has a data capacity of one or more clusters (1 M bits in this example). When the audio signal is compressed as in MD, DR
It takes 0.9 seconds to completely read data into the AM 14, and this data corresponds to about 3 seconds of audio data. In other words, even if data cannot be written to the correct address due to an external shock or the like, the write data is stored in the DRAM 14 and the write data is output from the DRAM 14 after the write position is restored to the correct address. You. Further, when a shock is applied while data is being written, the recording operation is immediately stopped, and a write operation is performed again after accessing a correct address.

When the read data is fully stored in the DRAM 14 during reproduction, even if the signal on the disk 31 cannot be read due to an external shock or the like,
In the case of audio data, it is possible to keep outputting the reproduction signal for about 3 seconds. In the meantime, the optical pickup is re-accessed to the original position and the signal is read again, whereby the occurrence of sound skipping can be prevented.

The image memory 5 has an area for pattern data and an area for character data in addition to areas for luminance signal data and chroma signal data. The pattern data and the character data are assigned to the pattern data area and the character data area. The pattern data and the character data are combined with the luminance signal data and the chroma signal data using a microprogram. in this way,
The video data in which the pattern data and the character data are combined is displayed on the display 9, and the video data in which the pattern data and the character data are combined can be recorded on the magneto-optical disk 31.

Next, the operation at the time of reproducing a still image will be described. At the time of still image reproduction, an image to be reproduced is designated by the key 17. The optical pickup 35 is moved to the address where the designated image is recorded, and the optical pickup 3
5, the compressed video signal of the designated image is reproduced from the magneto-optical disk 31. This reproduced signal is supplied to the decoder 42 via the RF amplifier 38. Decoder 4
In 2, processing such as demodulation of EFM and error correction is performed.

The output of the decoder 42 is the interface 2
4. The data is temporarily stored in the DRAM 14 via the CPU bus 12. Then, data from the DRAM 14 is supplied to the image compression / decompression circuit 13. Image compression / decompression circuit 1
In step 3, the still image video signal compressed by the JPEG method is expanded. That is, JPEG decoding is performed.
The expanded still image video signal is sent to the memory controller 4
Is stored in the image memory 5 under the control of.

The video signal stored in the image memory 5 is
It is supplied to the D / A converter 6. D / A converter 6
Is supplied to the video signal processing circuit 7. The output of the video signal processing circuit 7 is supplied to the display 9 via the display driver 8. The display 9 displays a reproduced still image. The video signal processing circuit 7 forms, for example, a composite video signal of the NTSC system, and the composite video signal is output from the analog video signal output terminal 10.

When recording audio data, the compressed audio data is temporarily stored in the DRAM 14. Then, the audio data is supplied to the encoder 39 of the magneto-optical disk drive 25 via the interface 24. The encoder 39 performs processing such as error correction encoding and EFM modulation, and records a compressed audio signal on the magneto-optical disk 31.

When reproducing audio data, compressed audio data is reproduced from the magneto-optical disk 31. The reproduced data is supplied to the decoder 42 via the RF amplifier 38, and the output of the decoder 42 is transferred to the CPU bus 12 via the interface 24. This compressed audio data is temporarily stored in the DRA
It is stored in M14. Then, the compressed audio signal is supplied from the DRAM 14 to the audio compression / decompression circuit 18.
Supplied to The audio signal is expanded by the audio compression / expansion circuit 18. This audio signal is supplied to the D / A converter 21. The output of the D / A converter 21 is output from the output terminal 22.

There are three types of magneto-optical disks 31: a read-only disk, a recordable magneto-optical disk, and a hybrid disk in which a read-only area and a recordable area are mixed. FIG. 3 shows a format of a magneto-optical disk 31 to which the present invention can be applied, and FIG. 4 shows a format of a hybrid disk 31 'to which the present invention can be applied.

The magneto-optical disk 31 has a polycarbonate substrate on which an information film is adhered, and a clamping plate 41 made of a magnetic material is mounted at the center thereof. The recording film of the information film is composed of a dielectric layer, an MO
It has a structure in which layers, dielectric layers, reflective films, and protective films are stacked. The read-only layer of the information film includes a reflective film and a protective film. The area of the recording film other than the clamping plate 41 of the disk 31 is an information area 42.

The innermost side of the information area 42 is a lead-in area 43. Lead-in area 4
3, a read-only film is deposited, and information is recorded in advance in the form of pits. A recordable area 44 exists on the outer peripheral side of the lead-in area 43, and a lead-out area 45 exists on the outermost peripheral. A recording film is deposited on the recordable area 44 and the lead-out area 45. UTO on inner side of recordable area 44
A C area 46 is arranged, and a program area 47 is arranged on the outer peripheral side.

Lead-in area 43 and UTOC area 4
Between 6, that is, in the innermost circumference of the recordable area,
A calibration area 48 exists. Also, UT
A gap area 49 exists between the OC area 46 and the program area 47. No user data is recorded in the calibration area 48 and the gap area 49. Calibration area 48
Is provided for adjusting the laser output during recording.

In the case of the hybrid disk 31 ′ shown in FIG. 4, the innermost side of the information area 42 is the lead-in area 43, and the lead-out area 45 is located at the outermost side, similarly to the magneto-optical disk 31. is there. A first program area 51 exists on the outer peripheral side of the lead-in area 43. A read-only film is applied to the lead-in area 43 and the first program area 51, and information is recorded in advance in the form of pits. A recordable area 52 exists on the outer peripheral side of the lead-in area 43. The UTOC area 53 is arranged on the inner peripheral side of the recordable area 52, and the second program area 54 is arranged on the outer peripheral side thereof.

In the hybrid disc 31 ′, a calibration area 48 exists between the first program area 51 and the UTOC area 53, that is, on the innermost circumference of the recordable area 52. Also, UTOC
Between the area 53 and the second program area 54,
A gap area 49 exists.

The innermost lead-in area 43 of the magneto-optical disk 31 has a P-TOC (premastered TOC).
(Table Of Contentes) is recorded in advance. P-
As will be described later in detail, the TOC describes a start address and an end address of each song on the disc, a track name as a song name, a disc name as a disc name, and the like. Further, a U-TOC (user TOC) is recorded in the U-TOC area 46 of the magneto-optical disk 31 in order to manage recorded signals. As for the U-TOC, sector 0,
The format of sector 1, sector 2, etc. is defined.

When performing a recording / reproducing operation on the magneto-optical disk 31, it is necessary to read management information (ie, P-TOC, U-TOC) recorded on the magneto-optical disk 31. The CPU 11 determines the address of the area to be recorded and the address of the area to be reproduced on the magneto-optical disk 31 according to the management information. This management information is temporarily stored in the DRAM 14, and thereafter, a part of required data is transferred to the CPU 11. The CPU 11 reads out the management information when the magneto-optical disk 31 is loaded, stores it in the DRAM 14, and can refer to the information at the time of recording / reproducing operation on the magneto-optical disk 31 thereafter. Note that M
On a magneto-optical disc (MD picture) on which D DATA or still picture information is recorded, file management data is recorded in a user data recording area, and when the disc is mounted, this file management data is read in addition to the TOC.

The U-TOC is edited and rewritten in accordance with recording or erasing of data. The CPU 11 performs this editing process on the U-TOC information stored in the DRAM 14 every time a recording / erasing operation is performed. Then, the U-TOC area of the magneto-optical disk 31 is rewritten at a predetermined timing. For example, a magneto-optical disk 31
The U-TO on the magneto-optical disk 31 is used when the eject operation of
C is rewritten.

Here, a data sector recorded on the magneto-optical disk 31 in the form of sector data, a P-TOC sector for managing data recording / reproducing operations, and U
-TOC sector will be described. First, the P-TOC sector will be described.

As the P-TOC information, the designation of an area such as a recordable area (recordable user area) of the disc and the management of the U-TOC area are performed. In the case where the magneto-optical disk 31 is a pre-mastered disk which is a read-only optical disk, it is possible to manage music recorded in ROM by the P-TOC.

FIG. 5 shows one sector (sector 0) of P-TOC information repeatedly recorded in the lead-in area 43 for P-TOC. In addition, P-
Although TOC sectors exist from sector 0 to sector 4, sectors 1 and thereafter are optional. The P-TOC sector is (4 bytes × 588 = 2352 bytes), and the first 4 bytes are used as a header. The header includes a synchronization pattern composed of all-`0` or all`1` one-byte data, and an address indicating a cluster address and a sector address.

After the header, an identification ID by an ASCII code corresponding to the character "MINI" is added to a predetermined address position to indicate that the area is a P-TOC area. Next, the disc type and recording level, the music number of the first music piece recorded (Fitst TNO), the music number of the last music piece (Last TNO), the lead-out area 45
Start dress LO _A , sector usage status (User secto
rs), the start address PC _A of the calibration area 48 and the start address U of the U-TOC area 46
ST _A and the start address RST _A of the recordable program area 47 are recorded.

Subsequently, a correspondence table instruction data section having table pointers (P-TNO1 to P-TNO255) for associating each piece of music or the like recorded in the pit form with a parts table in a management table section described later is prepared. I have. Then, in the area following the corresponding table instruction data part, (01h) to (01h) to (P-TNO1) correspond to the table pointers (P-TNO255).
A management table section having 255 parts tables up to (FFh) is prepared. In the present specification, the numerical value with "h" indicates a so-called hexadecimal notation.

Each of the parts tables can record a start address as a starting point, an end address as an end, and mode information (track mode) of the part for a certain part. The track mode information in each part table records, for example, information on whether the part is set to prohibit overwriting or data copying, whether it is audio information, and the type of monaural / stereo. .

Each of the parts tables from (01h) to (FFh) in the management table section has a table pointer (P-TNO1 to P-TNO1).
P-TNO255) indicates the contents of the part. In other words, for the song of the first song, the table pointer P-TN
A part table (for example, (01h)) is recorded as O1. In this case, the start address of the part table (01h) is the start address of the recording position of the music of the first music, and similarly, the end address is the first music. Is the end address of the position where the song has been recorded. Further, the track mode information is information on the first music piece.

Similarly, for the second music, a parts table (for example, (02h)) indicated by the table pointer P-TNO2
The start address, the end address, and the track mode information of the recording position of the second music piece are recorded in the record. Similarly, table pointers up to P-TNO255 are prepared in the same manner, so that up to the 255th tune can be managed on the P-TOC. Then, by forming the P-TOC sector 0 in this way, for example, during reproduction,
A predetermined music piece can be accessed and reproduced.

In the case of a recordable / reproducible MD (magneto-optical disk), since there is no so-called pre-mastered music area, the above-described correspondence table instruction data section and management table section are not used, and therefore, each byte is All are set to “00h”. The management of the recorded data is managed by U-TOC described below. However, for the above-mentioned hybrid type disc 31 ', its ROM area (first program area 5
The correspondence table instruction data section and the management table section are used for managing the music in 1).

Next, sector 0 and sector 1 of the U-TOC will be described as the U-TOC. The sectors 2 and 4 will be described later briefly. Also,
Sector 3, sectors 5-7 are undefined. FIG.
The format of TOC sector 0 is shown, in which management information on music recorded by the user and free areas in which new music can be recorded is mainly recorded.

For example, when recording a certain music on the magneto-optical disk 31, the CPU 11 executes the U-TOC
A free area on the disk is searched for from sector 0, and audio data is recorded there. At the time of reproduction, the area in which the music to be reproduced is recorded is determined from U-TOC sector 0, and the reproduction operation is performed by accessing the area.

The U-TOC sector 0 shown in FIG.
As in the TOC, a header is first provided, followed by a maker code, a model code, a music number of the first music piece (First TNO), a music number of the last music piece (Last TNO) at a predetermined address position,
Data such as a sector usage status (Used sectors), a disk serial number, and a disk ID are recorded. further,
Various table pointers (P-DFA, P-EMPTY) are used as the corresponding table instruction data section to identify the area of the music or the free area recorded by the user by making it correspond to the management table section described later. , P-FRA,
An area for recording P-TNO1 to P-TNO255) is prepared.

Then, the table pointers (P-DFA to P-TN)
O255) is provided with 255 parts tables (01h) to (FFh) as the management table section, and each part table has a P-TO of FIG.
As in C sector 0, a start address as a starting point, an end address as an end, and mode information (track mode) of the part are recorded for a part. Further, in the case of the U-TOC sector 0, since the parts indicated in each part table may be successively connected to other parts, the start address and the end address of the connected parts are recorded. Link information indicating a table can be recorded.

In this type of recording / reproducing apparatus, even if data of one music piece is physically discontinuous, that is, even if it is recorded over a plurality of parts, it is reproduced while accessing between parts, so that the reproduction operation is not hindered. For this reason, the music or the like recorded by the user may be recorded in a plurality of parts for the purpose of efficient use of the recordable area. Therefore, link information is provided, and the part tables can be connected by specifying the part tables to be connected, for example, by the numbers (01h) to (FFh) given to the respective part tables.

Incidentally, the link information is actually indicated by a numerical value which is a byte position in the U-TOC sector 0 by a predetermined arithmetic processing. That is, 304+ (link information) ×
Specify the parts table as 8 (byte).

It is to be noted that a music or the like recorded in a pit form on a premastered disc or the like is not usually divided into parts, and as shown in FIG.
In C sector 0, the link information is all "(00h)".

That is, in the management table section in the U-TOC sector 0, one part table expresses one part. For example, for a music composed of three parts connected, linking is performed by link information. The position of the part is managed by the three parts tables.

Each part table from (01h) to (FFh) in the management table section of U-TOC sector 0 is a table pointer (P-DFA,
P-EMPTY, P-FRA, P-TNO1 to P-TNO255) indicate the contents of the part as follows.

The table pointer P-DFA indicates a defective area on the magneto-optical disk 31. The table pointer P-DFA indicates a track area (= part) which becomes a defective area due to a scratch or the like in one or more parts tables. Of the first part table is specified. In other words, if there is a defective part, (01h) to
(FFh) is recorded, and the corresponding part table indicates the defective part by the start and end addresses. If another defective part exists, another part table is designated as link information in the part table, and the defective part is also indicated in the part table. If there is no other defective part, the link information is set to “(00h)”, for example, and there is no link thereafter.

The table pointer P-EMPTY indicates the head part table of one or a plurality of unused part tables in the management table section. If an unused part table exists, the table pointer P-EMPT is used.
As Y, any one of (01h) to (FFh) is recorded. If there are multiple unused part tables, the part tables are sequentially specified by the link information from the part table specified by the table pointer P-EMPTY, and all the unused part tables are connected on the management table section. Is done.

The table pointer P-FRA indicates a free area (including an erased area) on which data can be written on the magneto-optical disk 31, and a track portion (= part) serving as the free area is indicated. The first parts table in one or more parts tables is specified. In other words, if a free area exists, any one of (01h) to (FFh) is recorded in the table pointer P-FRA, and the parts table corresponding to the free area is indicated by the start and end addresses. Have been. Further, when there are a plurality of such parts, that is, when there are a plurality of parts tables, the link information sequentially designates parts tables whose link information is “(00h)”.

By the way, in the case of a magneto-optical disk in which audio data such as music is not recorded at all and has no defect, the part table (01h) is designated by the table pointer P-FRA. This indicates that the entire area is a free area. Since the remaining part tables (02h) to (FFh) are not used, the part table (02h) is designated by the table pointer P-EMPTY, and the part table (02h) The parts table (03h) is designated as the link information, and so on up to the parts table (FFh). In this case, the link information of the parts table (FFh) is set to “(00h)” indicating no connection thereafter.

At this time, in the parts table (01h), the start address of the recordable user area is recorded as the start address, and the address immediately before the lead-out start address is recorded as the end address. .

The table pointers P-TNO1 to P-TNO255 indicate songs recorded on the magneto-optical disk 31 by the user.
A part table indicating a temporally leading part of one or a plurality of parts in which data of the music is recorded is designated.

For example, if the first music piece is recorded on the disc without dividing the track, that is, recorded as one part, the recording area of the first music piece is stored in the parts table indicated by the table pointer P-TNO1. At the start and end addresses.

Further, for example, when the second music piece is discretely recorded on a plurality of parts on the disc,
Each part is designated in order of time to indicate the recording position of the music. That is, the table pointer P-TNO2
The other part tables are sequentially specified in order from the part table designated by the link information according to the link information, and linked to the part table in which the link information is "(00h)". In this way, for example, since all the parts on which the data constituting the second music are recorded are sequentially designated and recorded, the data of the U-TOC sector 0 can be used for reproducing the second music or for the second music. When performing overwriting on the area, the positions of the optical pickup 35 and the magnetic head 34 are controlled so that continuous music information can be extracted from discrete parts, and recording can be performed using the recording area efficiently.

Next, the U-TOC sector 1 will be described. FIG. 7 shows the format of U-TOC sector 1. The U-TOC sector 1 is a data area for recording input character information, mainly when giving a song title or a disc title to a song recorded by the user.

In the U-TOC sector 1, slot pointers P-TNA1 to P-TNA255 are prepared as a character slot instruction data portion corresponding to each recorded music. In addition, a character slot designated by the slot pointers P-TNA1 to P-TNA255 is prepared. 1 in the character slot
Slots (01h) to (FFh) of 255 units are formed in units of 8 bytes, and character data is managed in substantially the same form as that of the U-TOC sector 0 described above.

In the slots (01h) to (FFh), character information as a disc title (disc name) or a song name (track name) is recorded in ASCII code. The 8 byte slot before the slot (01h) is a dedicated area for the disc name.

Then, for example, in the slot specified by the slot pointer P-TNA1, the character input by the user corresponding to the first music is recorded. For example, if the pointer indicated by P-TNA1 is 2, (76) of sector 1
Starting from (+ 2 × 2) × 4 bytes, the track name of the first song is entered. The same applies to P-TNA2 and later. Further, by linking the slots with the link information, the character input corresponding to one music piece (track) can be handled even if it becomes larger than 7 bytes (7 characters). Note that this UT
In OC sector 1, the slot pointer P-EMPTY manages unused slots. That is, the unused slots are managed in the same manner as the management method of the unused parts table using the table pointer P-EMPTY of the U-TOC sector 0 described above.

In addition to the above-mentioned U-TOC sector 0 and sector 1, as U-TOC sector 2, a data area for recording the recording date and time of the music mainly recorded by the user is prepared. FIG. 8 shows the data configuration of U-TOC sector 2.
An MD recorder capable of using the U-TOC sector 2 can automatically record the date and time of recording simultaneously with recording. P-TRD1 is written at the start address on sector 2 that contains the date and time when the first song was recorded. That is, if the pointer indicated by P-TRD1 is 3, the recording date and time of the first music piece is written starting from (76 + 3 × 2) × 4 bytes of sector 2. The same applies to P-TRD2 and thereafter.

As in the case of the sector 1, a data area for recording input character information when a user gives a song title or a disc title is prepared as the U-TOC sector 4. You. The data configuration of the sector 4 is almost the same as that of the U-TOC sector 1. However, in this sector, code data corresponding to Chinese characters and European characters is recorded, and the U-TOC sector 1
In addition to the data, the attribute of the character code used as the character code is recorded at a predetermined byte position. This U
The management of the character information of the TOC sector 4 is similar to that of the sector 1 in that the slot pointer P-
TNA1 to P-TNA255 and slot pointers P-TNA1 to P-TNA2
255-unit slot (01h) specified by 55
(FFh).

FIG. 9 shows processing when the drive reads the above-mentioned P-TOC sector and U-TOC sector. It is determined in step S1 whether or not the magneto-optical disk 31 has been mounted, and when it is detected that the magneto-optical disk 31 has been mounted, first, the lead-in area 43 is reproduced, and the P-TOC recorded therein is read from the disk drive 25. The data is stored in the DRAM 14 via the interface 24. Further, the CPU 11 reads necessary information in the P-TOC from the DRAM 14 into the RAM 16.

The CPU 11 determines whether the mounted disk is a magneto-optical disk based on the holes provided in the cartridge (step S3). A flag indicating whether the disk is a magneto-optical disk is provided. In the case of a magneto-optical disk, this flag is set. Otherwise, the TOC reading process ends. In the case of a magneto-optical disk, in step S4, the U-TO
The C area 46 is reproduced, and the reproduced U-TOC is transmitted from the disk drive 25 to the D
It is stored in the RAM 14. Further, if the CPU 11
The necessary information in the U-TOC from M14 is read into the RAM 16.

The CPU 11 determines whether it is a data MD or a music MD from the character information recorded in the P-TOC. For example, in the case of a music MD, MINI characters are written, and in the case of a data MD, MINX characters are written. A flag indicating whether or not the disc is a data MD is provided. When the mounted disc is a data MD, this flag is set. In the case of the data MD, unlike the music MD, a data management file is recorded in the program area in addition to the U-TOC described above. The recording position of this data management file is UT
The data management file is written as OC information. Therefore, in the next step S6, the recording position of the data management file is accessed, and this data management file is read into the DRAM.

In one embodiment of the present invention, a verify operation for checking whether or not writing has been correctly performed is performed. The CPU 11 controls the verify operation according to the flowchart shown in FIG. First, in step S11, it is checked whether or not the writing is the first writing.
The verification is performed at the time of the first writing. The first writing means the first writing after power-on or disk loading. In addition, unlike this one embodiment,
Verification may be performed at the time of the first reading after loading the disc. That is, when the disc is loaded, the TOC information is read as described above. At the time of this reading, predetermined data prepared may be written to perform verification.

If the result of the check in step S11 is negative, no verify processing is performed. Step S11
In, if it is determined that the writing is the first writing, the process proceeds to step S12. In this step S12,
The predetermined data for verification is stored in the memory 23A. As the predetermined data, either data created for verification or valid data to be written first can be used.

In the next step S13, the memory 23
The contents of A are transferred to the DRAM 14. In step S14, it is checked whether it is the first writing. 1
If the writing is the first writing, the laser power at the time of recording is reduced in step S15. When it is not the first writing, that is, in the case of the second writing, the laser power is the same as that at the time of normal recording. CPU1
1 controls the optical pickup 35 in the disk drive 25 via the servo control circuit 37, and the laser power is adjusted.

Predetermined data stored in the DRAM 14 is transmitted to the disk drive 2 via the interface 24.
5 and recorded in a predetermined area of the magneto-optical disk 31 (step S16). As the predetermined area,
The original area for the first write or the area set for verification (the calibration area 48 or the blank area 49) is used.

Immediately after writing, the written data is reproduced by the disk drive 25 and written to the DRAM 14 via the interface 24 (step S17). In step S18, the reproduction data stored in the DRAM 14 is transferred to the memory 23B. The CPU 11 is a memory 2
The contents of 3A (written data) and the contents of memory 23B (read data) are compared to check whether they match (step S19). If the two match, the result of the verification is determined to be good, and the process ends.

If the two do not match in step S19, it is checked in step S20 whether or not this is the first write. If even one bit of the data is different, it is detected as a mismatch. However,
The number of mismatched bits may be counted, and when the number of mismatches is greater than a predetermined value, it may be treated as mismatched. If a mismatch is detected in the first writing, a warning display of the first writing abnormality is made in step S21, and the process returns to step S13. In the first writing, as described above, since the laser power is lowered, the first warning of the writing abnormality performed on the display 9 under the control of the CPU 11 is, for example, "There is a writing error. ", A warning is given that there is a high possibility that writing will not be performed normally due to a decrease in laser output or the like.

After step S13, the verify operation is performed in the same manner as described above, but the processing for lowering the laser power in step S15 is not performed for the second write operation. If a mismatch between the contents of the memories 23A and 23B is detected in step S19, a warning of a second write error is issued in step S22. This warning has a meaning that the laser output is considerably reduced or the magneto-optical disk itself is unusable due to a scratch or the like, for example, "Writing is not possible."

The warning may be not a display but a sound such as a buzzer. Alternatively, the second writing may be stopped to issue a warning. Further, a warning may be issued if there is an abnormality when the second rewriting is performed, without performing the warning at the first writing stage. Furthermore, the area on the disk where the first writing is performed and the area on the disk where the second writing is performed need not be the same and may be different.

[0089]

According to the present invention, at the time of recording on a magneto-optical disk, it is possible to know in advance before writing valid data that normal writing cannot be performed due to deterioration of the laser or contamination of the disk. Writing invalid data that becomes invalid can be prevented. Specifically, when a warning about a writing error is issued, first replace the disk to check the effects of dirt on the disk, and if the error is not corrected after replacing the disk, change the laser output. Set defects such as deterioration can be determined. According to the present invention, the verify is performed only at the time of the first write or the first read, so that the time required for the write operation can be prevented from being longer than when verify is always performed at the time of write.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of a disk drive to which the present invention is applied.

FIG. 2 is a block diagram illustrating an example of a disk drive.

FIG. 3 is a schematic diagram used for describing an example of a magneto-optical disk to which the present invention can be applied.

FIG. 4 is a schematic diagram used to explain another example of a magneto-optical disk to which the present invention can be applied.

FIG. 5 is a schematic diagram used for describing a data configuration of a P-TOC sector 0;

FIG. 6 is a schematic diagram used to explain the data configuration of U-TOC sector 0;

FIG. 7 is a schematic diagram used to explain the data configuration of U-TOC sector 1;

FIG. 8 is a schematic diagram used to describe the data configuration of U-TOC sector 2.

FIG. 9 is a flowchart used to describe a TOC reading operation when a disc is mounted.

FIG. 10 is a flowchart used to describe a verify operation of one embodiment of the present invention.

[Explanation of symbols]

1 ... video signal input terminal, 5 ... image memory, 9
... Display, 11 ... CPU, 13 ... Image compression / expansion circuit, 14 ... DRAM, 18 ... Audio compression / expansion circuit, 23 ... Verification memory,
25: disk drive, 31: magneto-optical disk, 33: spindle motor, 34: magnetic head, 35: optical pickup

Continued on the front page (51) Int.Cl. ⁶ Identification code FI G06F 3/06 305 G06F 3/06 305D 3/08 3/08 F G11B 7/00 G11B 7/00 K

Claims (10)

[Claims] 1. A disk device for recording data on a disk-shaped recording medium, comprising: a pickup unit for writing data on the disk-shaped recording medium and reading data from the disk-shaped recording medium; Recording processing means for generating data to be supplied to the pickup means, a first memory for storing the write data, and reproduction processing means for supplying data read by the pickup means; A second memory storing the reproduced data from the reproducing means, and a means for verifying by comparing the contents of the first and second memories only at the time of first writing or first reading. A disk device, comprising: 2. The disk device according to claim 1, wherein the verifying means generates a warning notifying that writing is unstable when the contents of the first and second memories do not match. A disk device. 3. The disk device according to claim 1, wherein the verifying means is configured to write data stored in the first memory when the contents of the first and second memories do not match. Characterized in that the data is re-written, the re-written data is reproduced and stored in a second memory, and verification is performed by comparing the contents of the first and second memories. 4. The disk device according to claim 3, wherein the means for performing the verification performs the first write with a lower laser power. 5. The disk device according to claim 3, wherein the verifying means performs the writing only when the writing is performed again and the contents of the first and second memories do not match. A disk device for giving a warning of an abnormality. 6. The disk device according to claim 3, wherein the verifying means is configured to perform a first write error if the contents of the first and second memories do not match after the first write. And a second write error warning different from the first warning is issued when the contents of the first and second memories do not match after writing again. . 7. The disk drive according to claim 1, wherein data is written for verification in a temporary write area different from the user data write area. 8. The disk device according to claim 1, wherein when a disk-shaped recording medium is mounted, predetermined data is stored in the first memory, and the contents of the first memory are stored in the disk-shaped recording medium. A disk device for writing on a medium. 9. The disk drive according to claim 1, wherein when the disk-shaped recording medium is mounted, the management data recorded in a predetermined area of the disk-shaped recording medium is read out, so that the first reading is performed. A disk device characterized by performing: 10. The disk device according to claim 1, wherein the verifying means has a counter for counting the number of mismatches between the contents of the first and second memories, and the count value of the counter is If it is equal to or greater than the specified value,
A disk device which controls so as to generate the warning.