JP2000076802A - Information recording and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an information recording and reproducing method which deals with a recording error while a recording delay is being suppressed to a minimum by a method wherein, when the recording error is generated, user data after data, to be recorded, onward and logic address information are recorded in such a way that their recording position is slipped backward by one block. SOLUTION: In a recording operation, a microprocessor 604 generates logic address information which corresponds to a logic address, and the logic address information is given to a recording circuit 606. The recording circuit 606 encodes the logic address information together with user data so as to be recorded in a designated block on a DVD-RAM medium 610. When a recording error is generated, the user data and the logic address information are recorded as they are in such a way that their recording position is slipped backward by one block without being encoded again. In a reproducing operation, when a block which is indicated by a designated reproducing-start logic address is reproduced, an operation which deals with the recording error is performed when the logic address information which is recorded in a reproducing block is not matched with the designated reproducing-start logic address.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium having a plurality of physical blocks recorded by adding logical address information to user data when recording the user data.
In addition, the present invention relates to an information recording apparatus for recording / reproducing information on / from the information recording medium, particularly for real-time applications such as recording / reproduction of moving image information, so that recording / reproduction can be continued without delay even if a recording error occurs Recording / reproducing method to be performed.

[0002]

2. Description of the Related Art Conventionally, in a recording medium such as an MO, an HDD, a DVD-RAM and a recording / reproducing apparatus, the handling of a defective block is, for example, as described in MO's "ISO / IEC 14517" standard. Ripping algorithms and linear replacement algorithms are common. In the former, an initial defect is detected by the certification at the time of initializing the medium and registered in a defective block list on the medium, so that the logical address is assigned in a form in which the defective block is slipped. Since an access instruction is issued from a higher-level device using a logical address, an access instruction is not given to the defective block. On the other hand, the latter assigns a spare block as a replacement block to a defective block detected at the time of recording on the medium, registers this link information in a list of defective blocks on the medium, and assigns the logical address when an access instruction to the logical address is received next time. This is a method for accessing the replacement block.

[0003]

In recent years, MO, HDD, D
Recording media such as VD-RAMs and recording / reproducing devices have begun to be used not only for recording / reproducing data for computers, but also for recording / reproducing data for applications requiring real-time properties such as moving image data. For this reason, when a recording / reproducing method for a defective block such as the linear replacement algorithm is used, a delay occurs due to an access between the defective block and the replacement block, and there is a problem that a real-time request from a host device cannot be satisfied.

In view of the above, the present invention proposes an information recording / reproducing method capable of suppressing a delay and coping with a recording error instead of the linear replacement algorithm.

[0005]

According to the invention for solving the above-mentioned problem, a higher-level device specifies a logical address, and
An information recording medium having a plurality of physical blocks recordable by adding a logical address to logical address information to user data or adding a logical address to a logical address to form logical address information; When a recording error occurs during recording, the user data and logical address information following the data to be recorded in the block are slipped backward by one block and recorded.

When reproducing an area which may have slipped by the above recording method, first, a logical block instructed to be reproduced by a host device is reproduced. If the logical address indicated by the logical address information of the reproduced block does not match the logical address specified by the higher-level device, a reproduction start logical address is obtained from the difference between these addresses, and the block is reproduced. If the logical address indicated by the reproduced logical address information is equal to the logical address specified by the host device, the reproduction is started.

[0007] When a block in which a recording error has occurred is reproduced, a reproduction error may occur. When a reproduction error occurs, the next block is reproduced, and the reproduction with the reproduction error block interposed therebetween was normally performed. If the logical address information of the two blocks is discontinuous, the reproduction error block is recorded as normal, but is determined to be an error block during reproduction, and an error is reported to a higher-level device, or dummy data is transferred to a higher-level device. If the logical address information of the two blocks that successfully reproduced with the reproduction error block interposed therebetween is continuous, the reproduction error block is determined to be a recording error and a slipped block. Do not transfer data to the host device.

Further, by storing the slip amount at the end of the recording / reproducing command in the built-in memory of the recording / reproducing apparatus, when a continuous recording / reproducing command is received, the recording / reproducing command specified by the higher-level apparatus is received. By starting recording / reproduction from a position shifted by the slip amount stored with respect to the reproduction start logical address, even if the recording / reproduction command is divided into a plurality of commands, it is possible to slip over the commands.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 6 is a block diagram showing a schematic configuration of a DVD-RAM recording / reproducing apparatus as an example for implementing the present invention. The host device 601 is a host device of the DVD-RAM recording / playback device, and the command issued from the host device 601 is:
The data is received by the interface controller 602 and transmitted to the microprocessor 604. Microprocessor 6
04 has a control memory 605 which is a high-speed IC memory.
If the command issued from the higher-level device 601 is a recording request, the microprocessor 604 performs an operation of transferring the recording request data from the higher-level device 601 to the buffer memory 603 connected to the interface controller 602 via the interface controller 602. Do. Next, the microprocessor 604 performs an operation of transferring the recording request data from the buffer memory 603 to the buffer memory 607 connected to the recording circuit 606 via the interface controller 602 and the recording circuit 606. Next, the microprocessor 604 instructs the recording circuit 606 to perform encoding, and the recording circuit 606 performs recording request data encoding processing on the buffer memory 607. At this time, the microprocessor 604 instructs the recording circuit 606 of an address value for the address in the recording area, and the recording circuit 606 adds the address in the recording area at the time of encoding. Then, the microprocessor 604 includes a recording circuit 606
The recording circuit 606 instructs the DVD-RAM medium 610 to record the encoded data at a predetermined position.
Recording is performed at a predetermined position on the medium 610.

When the instruction issued from the host device 601 is a reproduction request, the microprocessor 604 sends the reproduction circuit 6
08, the reproduction circuit 608 instructs to reproduce data from a predetermined position of the DVD-RAM medium 610, and reproduces data reproduced from the predetermined position of the DVD-RAM medium 610 into a buffer connected to the reproduction circuit 608. The data is stored in the memory 609. Then, when there is an error in the reproduced data, the reproduction circuit 608 performs error correction. Next, the microprocessor 604 stores the buffer memory 609.
Then, an operation of transferring the error-corrected reproduction data from the reproduction data to the buffer memory 603 via the reproduction circuit 608 and the interface controller 602 is performed. Then microprocessor 60
Reference numeral 4 denotes an operation for transferring reproduction data from the buffer memory 603 to the host device 601 via the interface controller 602.

Next, FIG. 5 is a diagram schematically showing a physical block of a DVD-RAM medium as an example for implementing the present invention. Physical blocks are divided into Header field, Mirror field,
Gapfield, Guard field, VFO3 field, Pre-Synchronous
code (PS) field, Data field, Postamble3 (PA3) fie
ld, Guard filed, Buffer field. this house,
The Header field and the Mirror field are non-recording areas, and the rest are recording areas. In the Header field, a physical address allocated to the block when the recording medium is manufactured is recorded. When the recording medium is formatted, a logical address is allocated to the block, and the correspondence between the physical address and the logical address is recorded in a certain area on the medium, and logical address information is based on the logical address. It is determined. Data field is Data ID, IED, User D
ata, EDC. Data ID is an address portion in the recording area, and is usually the logical address of the block + H'31.
000 is recorded. The User Data encodes the data received from the host device, and the error correction code and SYNC cod
Record the data with e added.

[0013] DVD-RAM media and DVD-RAM recording and
An embodiment in a reproducing apparatus will be described with reference to FIGS.

FIG. 1 shows a flowchart of an example of recording control according to the present invention. Upon receiving the recording instruction from the higher-level device 601, the recording data is received from the higher-level device 601 as in step 101,
The data is stored in the buffer memory 603 connected to the interface controller 602. Next, as in step 102, the data received from the host device is encoded using the recording circuit 606. It corresponds to logical address information in encoding
Although the Data ID is also added, the microprocessor 604 simultaneously issues an encoding instruction to the recording circuit 606 and logical address + H'31 as logical address information to be recorded in the Data ID.
000, and the recording circuit 606 encodes the Data ID as a logical address + H'31000. The encoded data is stored in the buffer memory 6 connected to the recording circuit 606.
Stored in 07. Next, as in step 103, the microprocessor 604 instructs the recording circuit 606 to record the encoded data at a predetermined position on the DVD-RAM medium 610, and the recording circuit 606 Recording is performed at a predetermined position. If it is determined in step 104 that the recording has been completed normally, the number of recording blocks is reduced by one block as in step 105, and the next recording block is shifted backward by one block. If the number of recording blocks is 0 in step 106, the recording process is terminated. If not, the process returns to step 101 to perform the recording process of the next block. If it is determined in step 104 that a recording error has occurred, the next recording block is slipped backward by one block as in step 107. In the present invention, in order to slip the user data and the logical address information, the recording position is shifted backward by a
Step 1 without re-encoding D as it is
Return to 03 and record.

FIG. 2 shows a flowchart of an example of reproduction control according to the present invention. Upon receiving a reproduction instruction from the higher-level device 601, the microprocessor 604 provides logical address information based on an address obtained by subtracting 1 from the reproduction start logical address specified by the higher-level device 601 in the control memory 605 in step 201. Into the Before Add register. Next, as in step 202, the block indicated by the reproduction start logical address specified by the higher-level device 601 is reproduced, and in step 203
As described above, when the reproduction is completed normally, the process proceeds to step 204, where the logical address information of the reproduction block is compared with Before Add + 1. Here, if the logical address information of the reproduction block is smaller, it is determined that the reproduction block is not the reproduction start block requested by the host device 601 and the process proceeds to step 206, where the logical address of the normal reproduction start block is calculated. To calculate the logical address of the playback start block,
From Before Add + 1 substituted in step 201 to step 202
Then, the logical address information of the reproduced block is subtracted, and a value obtained by adding the logical address information to the reproduction start logical address specified by the host device 601 becomes the logical address of the normal reproduction start block. The normal reproduction start logical address is reproduced in step 202. At this time, if the current logical address and the normal reproduction start logical address are relatively close, the logical addresses of consecutive blocks are read continuously or at predetermined intervals, and the logical address and the normal reproduction start logical address are compared. Thus, a normal reproduction start block can be reached.

If it is determined in step 203 that a reproduction error has occurred, the process proceeds to step 205, where the next reproduction block is set to 1
Shift block backwards and move that block to step 202
To play. If the logical address information of the reproduction block is equal to or greater than Before Add + 1 in step 204, it is determined that a normal reproduction start block has been detected, and the process proceeds to step 211. In step 211, the logical address information of the reproduction block and the Before
Add + 1 is compared, and if they are equal, the process proceeds to step 212, where the reproduction data is transferred to the host device 601. As in step 213, the number of reproduction blocks is reduced by one block, and the next reproduction block is shifted backward by one block. If the number of reproduction blocks becomes 0 in step 214, the reproduction process ends. If not, the process proceeds to step 218, where the logical address information of the reproduction block is substituted into the Before Add register, and the process proceeds to step 207 to reproduce the next reproduction block. . If the logical address information of the reproduction block is larger than Before Add + 1 in step 211, it is determined that the logical address information has been skipped because an error has occurred in the reproduction in step 202 or step 207. Without reporting, in step 215, one block of dummy data, for example, ALL00 data, is transferred to the host device 601 to supplement the missing block. Next, as in step 216, the number of reproduction blocks is set to 1
The block is subtracted, and 1 is added to the Before Add register.
If the number of playback blocks becomes 0 in step 217, the playback process is terminated. If not 0, the process proceeds to step 211, and steps 211, 215, 216, and 217 are repeated until the logical address information of the playback block and Before Add + 1 match. The dummy data is transferred to the higher order device 601. In step 207, the next block is reproduced, and step 2
If it is determined in step 08 that a reproduction error has occurred, the process proceeds to step 210, where the next reproduction block is shifted backward by one block.
To play. If playback ends normally in step 208,
As in step 209, if the logical address information of the reproduction block is equal to or greater than Before Add + 1, the process proceeds to step 211. If the logical address information of the reproduction block is smaller than Before Add + 1, the process proceeds to step 210, where the next reproduction block is shifted backward by one block and reproduced at step 207.

When recording / reproducing a file having a large size, the recording / reproducing instruction may be divided into a plurality of commands and instructed from the host device 601. Therefore, a method of slipping over a plurality of commands will be described with reference to FIGS.

FIG. 3 shows the slip amount at the end of the command,
This is an example of a slip amount storage table for storing a command end logical address, which is stored in a control memory 605 connected to a microprocessor 604. In this example, the number of elements is four, which means that even if a plurality of continuous recording / reproducing commands are received, up to four sequences can be handled by this table. The last logical address of the command stores the last logical address of each recording / reproducing command, and the number of slip blocks stores the amount of slip of the last block of the command.

It should be noted that the embodiment of the present invention is not limited to the above description. Even if an information recording / reproducing method having a plurality of slip amount storage tables capable of obtaining the same effect is used, the present invention is not limited to this. No problem.

FIG. 4 shows an example of a flowchart of control using the slip amount storage table of FIG. Host device 601
When a recording / reproducing command is received from the host device, 0 is substituted for the n register provided in the control memory 605 as in step 401, and the command start logical address and n The command last logical address of the element pointed to by the register is compared with +1. If they match, the command is determined to be a command that is continuous with the command last logical address of the element pointed to by the n register in the slip amount storage table. The command start logical address is shifted by the number of slip blocks of the element indicated by the n register in the storage table, and the flow advances to step 407 to execute the command. If the command start logical address and the command final logical address + 1 of the element indicated by the n register in the slip amount storage table do not match, 1 is added to the n register as in step 403, and as shown in step 405, the n register stores the slip amount. If the number of elements in the table is less than 4, the process returns to step 402. When the value of the n register becomes 4, it is determined that the command is not a command following the command stored in the slip amount storage table, and the free element number of the slip amount storage table is substituted into the register n as in step 406. If there is no empty element in the slip amount storage table, one of the elements is selected and the element number is substituted for the register n. Then, after executing the command in step 407, the logical address of the command last block is substituted for the command final logical address of the element pointed to by the n register of the slip amount storage table as in step 408, and as shown in step 409, Substitute the number of blocks where the last block of the command has been slipped into the number of slip blocks of the element indicated by the n register. Also, by recording the slip amount information in the memory together with the identification information of the information recording medium, the recording and reproduction can be performed by slipping an appropriate block when recording and reproducing the information recording medium next time.

[0021]

According to the present invention, even when a recording error occurs, it is possible to deal with the recording error by minimizing the delay, and to transfer the recorded data to the host device without mistake during reproduction. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a flowchart of a recording method according to the present invention.

FIG. 2 is a diagram showing an example of a flowchart of a reproduction method according to the present invention.

FIG. 3 is a diagram showing an example of a slipping amount storage table according to the present invention.

FIG. 4 is a diagram showing an example of a flowchart of control using a slip amount storage table according to the present invention.

FIG. 5 is a diagram showing a schematic configuration of a physical block of a DVD-RAM medium as an example of a recording medium according to the present invention.

FIG. 6 shows a DVD-ROM as an example of a recording / reproducing apparatus according to the present invention.
FIG. 2 is a diagram illustrating a schematic configuration of a RAM recording / reproducing device.

[Explanation of symbols]

 601: Host device 602: Interface controller 603 ... Buffer memory 604 ... Microprocessor 605 ... Control memory 606 ... Recording circuit 607 ... Buffer memory 608 ... Reproduction circuit 609 ... Buffer memory 610 ... DVD-RAM medium

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // G11B 7/00 G11B 7/00 K

Claims (4)

[Claims] 1. An information recording method for recording on an information recording medium having a plurality of physical blocks recorded by adding logical address information to user data when recording the user data. When an error occurs, the user data and the logical address information to be recorded after the block are slipped back and recorded one block at a time, so that even if a recording error occurs, the recording can be continued with a delay suppressed. Characteristic information recording method. 2. An information reproducing method for reproducing from an information recording medium recorded by the information recording method according to claim 1, wherein the recording medium comprises: a logical address; logical address information obtained by adding a constant to the logical address; A plurality of blocks for recording user data are provided, and at the time of starting reproduction of an area which may have been recorded by slipping according to the method of claim 1, first, a block indicated by a logical address designated by a higher-level device is reproduced, If the logical address indicated by the logical address information added to the user data of the reproduced block does not match the logical address of the block whose reproduction has been instructed by the higher-level device, the logical difference of the block containing the data to be reproduced is determined from the difference between them. An address is obtained, a block indicated by the logical address is reproduced, and the logic indicated by the logical address information of the reproduced block is obtained. If the address is equal to the logical address of the block instructed to be reproduced by the host device, reproduction is started, and even if data to be reproduced is slipped by the recording method of claim 1, reproduction is performed from the position of regular data. An information reproducing method characterized in that the information reproduction can be started. 3. An information reproducing method for reproducing from an information recording medium recorded by the information recording method according to claim 1, wherein a reproduction error occurs in an area where the information may have been slipped and recorded by the method of claim 1. When the error occurs, the next block of the reproduction error block is reproduced, and if the logical address information of the two blocks successfully reproduced with the reproduction error block interposed therebetween is discontinuous, the reproduction error block was recorded normally. By judging the block as having an error during reproduction and performing reproduction error processing, and determining that the reproduction error block is a recording error and a slipped block if it is continuous, and not transferring data to a higher-level device, Claim 1
An information reproducing method characterized in that a block slipped by the recording method of (1) can be slipped even during reproduction. 4. An information reproducing method for reproducing from an information recording medium recorded by the information recording method according to claim 1, wherein recording / reproduction of an area which may have been recorded by slipping by the method of claim 1. Time, the slip amount at the end of the recording / reproducing command is stored in a memory built in the information recording / reproducing apparatus, and is stored when a recording / reproducing command for the next continuous area comes. An information reproducing method characterized in that even if a command is divided, slipping can be performed over a plurality of commands by shifting a recording / reproducing start position by a slip amount.