JPS63316371A - Write once type storage device - Google Patents

Abstract

PURPOSE:To efficiently execute data recording processing within a short time by inputting marking information to a recording head and recording the input in its area during the passage of an optional sector through the recording head when a recording error is detected in the optional sector of a recording medium. CONSTITUTION:A recording head 6 and a reproducing head 7 capable of record ing and reproducing data on/from adjacent positions of a write once recording medium 5 are arranged, and at the time of data recording processing, data recorded in the medium 5 by the head 6 is reproduced by the head 7 immediate ly after the recording. A recording error is detected by comparing the input data to the head 6 with a reproduced data based upon the head 7 by an error detecting means 9 during the period of recording/reproducing based upon respec tive heads 6, 7. When a recording error is detected in a certain sector of the recording medium 5, marking information is inputted to the head 6 during the passage of a marking area of the sector through the head 6 to record the information on the marking area. Consequently, data recording processing time can be sharply shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a write-once storage device that records and reproduces data using a write-once storage medium such as an optical disk.

Conventional technology Conventionally, optical disk devices, which are write-once storage devices of this type, generally share one optical head for recording and reproducing data, and cannot record and reproduce data at the same time. Therefore, data recording processing has been performed using the method described below.

FIG. 6 is an explanatory diagram of conventional data recording processing, where 1 is a sector on an optical disk, and 2 is a block consisting of a fixed number of sectors 1. This block 2 is divided into a data recording area 3 and a replacement area 4. Each sector in the spare area 4 is used as a spare sector for a sector in the data recording area 3 when a recording error occurs, and is also used as a spare sector for the spare sector. Note that the number or symbol written above each sector is the sector number.

When recording data in one block 2, data is recorded in order from the first sector in the data recording area 3, as shown in FIG. Next, as shown in FIG. 6C, the data is sequentially reproduced from the first sector in the data area 3, and the normality is checked (verified).

For example, if a verify error (recording error) is detected in the 4th and 7th sectors in the data recording area 3, the 6th
As shown in Figure d, marking information is recorded in sectors 4 and 7 (marking processing), and sectors A1 and A2 in spare area 4, which are the respective spare sectors, are marked with 4
The data to be recorded in numbers 7 and 7 are recorded anew (replacement process). Next, as shown in FIG. 6e, the data in the replacement sector is reproduced and helifi is performed. If a recording error is again detected in the A2 sector, which is the replacement sector for the 7th sector, in this verification, marking information should be recorded in the A2 sector and then in the 7th sector as shown in Figure 6 f. Record data in sector A3. Thereafter, as shown in FIG. 6g, the data in sector A3 is reproduced and refined, and if no error is detected, the data recording process for one block is completed.

Problems to be Solved by the Invention As described above, in conventional optical disk devices, it is necessary to access the same program many times for data recording/reproduction, verification, error sector marking processing, and replacement processing. There was a problem that the recording processing time was long.

The above problem arises for the following reasons. Firstly, since data recording and reproduction cannot be performed simultaneously, it is necessary to perform the data recording operation and the data reproduction operation for verification separately. Second, since marking processing and replacement processing cannot be performed simultaneously with verification, it is necessary to perform data recording operations other than marking processing and replacement processing separately.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a write-once storage device such as an optical disk device that can perform data recording processing efficiently and in a short time. do.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a recording head and a reproducing head capable of simultaneously recording and reproducing data at close positions on a write-once recording medium. In processing, data recorded on a write-once storage medium by a recording head is reproduced by a reproduction head immediately after recording, and during recording and reproduction by each head, error detection means input data to the recording head and data reproduced by the reproduction head. Detect recording errors by comparing with
When a recording error in a certain sector of the storage medium is detected,
This apparatus has a configuration in which marking information is input to the recording head while the marking area of the sector is passing through the recording head and is recorded in the marking area.

Effect of the Invention With the above-described configuration, the present invention can perform reproduction and verification at the same time as recording data, and when a recording error is detected, can immediately perform marking processing on an error sector immediately after recording. Furthermore, data recording, verification, and marking processing can be performed immediately on the replacement sector of the error sector as well. Therefore, according to the present invention, data recording/reproduction, verification, marking processing, and replacement processing can be performed continuously in real time without repeatedly accessing the same program, thereby significantly shortening the data recording processing time.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of an optical disk device according to an embodiment of the present invention. This optical disk device records and reproduces data on an optical disk 5, which is a write-once storage medium.

This optical disc 5 is driven to rotate at high speed, but its drive mechanism is omitted in the figure.

6 is a recording head for optically recording data on the optical disc 5, and 7 is a reproducing head for optically reproducing recorded data on the optical disc 5. The recording head 6 and the reproducing head 7 are driven by a common access mechanism while maintaining a relative positional relationship such that the data recorded on the optical disk 5 by the recording head 6 can be reproduced by the reproducing head 7 immediately thereafter. However, since such an access mechanism may be the same as the conventional one, it is omitted from the drawing.

Note that the recording head and the reproducing head 7 may be realized as physically completely independent optical heads, or they may be physically integrated as one optical head and have a common optical system such as an objective lens. The recording point and the reproducing point may be shifted by a small distance relative to each other in the moving direction of the optical disk by dividing the beam. Whether physically independent or integrated, each head can basically have the same structure as a conventional optical head, so a detailed description of its structure will be omitted.

Reference numeral 8 denotes a control unit that controls recording and reproducing processing operations, data transfer with host devices, and the like.

Data to be recorded and marking information are input from the control unit 8 to the recording head 6, and data reproduced by the reproduction head 7 is input to the control unit 8. A data buffer 10 for delaying input data for a certain period of time, and reproduction data from the reproduction head 7 and the data buffer 10.
It consists of a comparator 11 that performs comparison (verification) with data output from.

When the comparison by comparator 11 results in a mismatch, comparator 1
An error detection signal ER is sent from the controller 1 to the controller 8.

The control unit 8 is of a program control type, and includes a microprocessor 12, a memory 13 for storing programs and data, a recording control circuit 14, a playback control circuit 15, a mechanism control circuit 16, a host interface circuit 17, etc., connected to a bus 18. This is the configuration connected to. The recording control circuit 14 reads data or marking information to be recorded from the memory 13 under the control of the microprocessor 12 and inputs it to the recording head 14 .

The reproduction control circuit 15 stores reproduction data in the memory 13 under the control of the microprocessor 12. The mechanism control port 'w115 controls the access mechanism under the control of the microprocessor 12.

Focus control and tracking control of the recording head 6 and reproducing head 7 are also performed by the mechanism control circuit 16. The error detection signal ER is input to the microprocessor 12 as an interrupt signal.

The data recording processing operation of the optical disk device configured as described above will be explained below.

FIG. 2 is an explanatory diagram of the data recording processing operation, and as in FIG. 1, 1 is a sector, 2 is a block, 3 is a data recording area, 4 is a replacement area, and numbers or codes written above each sector. is the sector number.

Figure 3 shows the sector format.
is divided into a data area DATA and a marking area MARK via a gap GAP. Data area DA
TA is an area where data is recorded, and marking area MARK is an area where marking information is recorded.
Gap GAP is an unrecorded portion.

FIG. 4 is a schematic flowchart of the data recording processing operation, and FIG. 5 is a schematic flowchart of the interrupt processing for marking processing. In the following description, the corresponding step numbers in each schematic flowchart are indicated in parentheses.

When recording data in one block, the data to be recorded in the first sector is read from the memory 13 by the recording control circuit 14 while the first sector is passing through the recording head 6 under the control of the microprocessor 12. The data are outputted and sequentially input to the recording head 6, and are recorded in the data area of the sector (step 1). During this recording operation, the data recorded in the first sector by the reproducing head 7 is reproduced immediately after the recording. Since this playback data is used only for verification, the playback control circuit 15
does not transfer playback data to the memory 13. The recording error detection circuit 11 compares the input data of the recording head 6 delayed by a certain period of time by the data buffer 10 with the reproduced data.

Note that the delay time caused by the data buffer 10 is equal to the delay time from when data is recorded by the recording head 6 to when the data is reproduced by the reproducing head 7.

Similarly, data is recorded in each sector in the data recording area 3, and each time the recording of one sector is completed, the microprocessor 12 determines whether the recording is complete (step 2).

When the final nth sector is recorded, the process proceeds to replacement processing (steps 3 and 4). Now, as shown in the 2nd mb, a recording error is detected during recording of the 4th sector and the error signal ER ( interrupt signal)
Suppose that occurs. At this time, the recording point of the recording head 6 is in the gap GAP of the sector, and the marking area M
I haven't progressed to ARK.

When an interrupt occurs due to the error signal ER, marking information is set by the interrupt processing of the microprocessor 8, and while the recording point of the recording head 6 passes through the marking area MARK of sector No. 4, this marking information is sent to the recording control circuit. 14 is input to the recording head 6 and recorded in the corresponding marking area MARKK (steps 5 and 6, FIG. 2C).

Note that the marking information indicates the recording error and the number of recording errors that have occurred in the block, and is a highly redundant code with a low probability of recording/reproducing errors occurring.

Since sector No. 4 is the sector in which a recording error was first detected, sector No. A1 is allocated as a replacement sector for sector No. 4. This allocation-related information is written in a specific area of the memory 8.

Now, as shown in FIG. 2d, when the recording of the last n-th sector is completed, the microprocessor 12
The 12 specific areas are referred to and it is determined whether replacement processing is necessary (step 3). Here, it is assumed that a recording error occurs not only in sector No. 4 but also in sector No. 7, and marking processing is performed.

Under the control of the microprocessor 12, while the data area DATA of the A1 sector assigned to the 4th sector is passing through the recording head 6, the data to be recorded in the 4th sector is read out from the memory 13 by the recording control circuit 14. The data is input to the recording head 6 and recorded in the data area (step 4). Even during this recording operation, the recorded data is reproduced and verified, and if a recording error is detected, interrupt processing for marking processing is executed.

Similarly, while the data area of sector A2, which is allocated as a replacement sector for sector 7, is passing through node 6, recording of data to be recorded in sector 7 (replacement process)
will be held. Then, as shown in FIG. 2e, when a recording error is detected in sector A2, marking information is recorded in the marking area of the sector.

As shown in FIG. 2f, data to be recorded in sector A2, that is, data to be recorded in sector No. 7, is recorded in the next sector A5. When data is normally recorded in this sector, the microprocessor 12 determines that the data recording process for the block has been completed.

In this way, this optical disk device continuously performs data recording/reproduction, verification, marking processing, and replacement processing in real time, and can complete data recording processing for one block by accessing the block once. can.

Note that in this embodiment, the marking information was created by the control unit 8 and inputted to the recording head 6, but this function may be realized by dedicated hardware.

Furthermore, although this embodiment is an optical disk device that uses an optical disk as a storage medium, the present invention can also be applied to similar write-once storage devices that use other write-once storage media.

Effects of the Invention As is clear from the above description, the present invention provides a recording head for recording input data on a write-once storage medium, and a reproduction system for reproducing data recorded by the recording head from the storage medium immediately after recording. means for detecting a recording error by comparing input data to the recording head with data reproduced by the reproduction head during recording and reproduction by each of the heads; When a recording error is detected, recording/reproduction and verification of data can be performed by inputting marking information to the recording head and recording it in the marking area while the marking area of the sector is passing through the recording head. Since marking processing and replacement processing for error sectors can be performed continuously in real time, the number of accesses to the storage medium is reduced and the data recording processing time is significantly shortened.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of an optical disk device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a data recording processing operation for one block on an optical disk.
2 shows the block configuration, FIGS. 2 to 2f show the progress of the data recording process, FIG. 3 shows the sector 7 capacity of the optical disc, FIG. 4 is a schematic flowchart of the data recording process, FIG. 5 is a schematic flowchart of marking processing, FIG. 6 is an explanatory diagram of data recording processing operation in a conventional optical disk device, and FIG. 6g shows the block configuration. indicates the progress of data recording processing. 1... Sector, 2... Block, 3... Data recording area, 4... Spare area, 5... Optical disc,
6... Recording head, 7... Playback head, 8... Control section, 9... Recording error detection circuit, 10... Data buffer, 11... Comparator, DATA... Data area , MARK... Marking area. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 2 7 L error? E 3rd drawing'S 4th figure 5th figure 6th figure

Claims (1)

[Claims] a recording head for recording input data on a write-once storage medium;
A playback head that plays back data recorded by the recording head from the storage medium immediately after the recording, and a comparison between data input to the recording head and data played back by the playback head during recording and playback by each of the heads. means for detecting a recording error, and when a recording error is detected in any sector of the storage medium by the means;
1. A write-once storage device comprising: means for inputting marking information to the recording head while the marking area of the sector is passing through the recording head to cause the recording head to record the marking information in the marking area.