JPH06162684A - Information recording/reproducing system - Google Patents

Abstract

PURPOSE:To rapidly cope with an error even if a malfunction occurs in out-of- tracking detecting means itself by returning the error to a host system if a track number detected before recording/reproducing is different from that detected after ending. CONSTITUTION:When a recording command, a reproducing command are generated from a host computer 12, an information recorder/reproducer 10 records/ reproduces continuous logic blocks. In this case, if physical track number read before recording/reproducing discords with that read after recording/reproducing, it is judged that there was an undetected out-of-tracking state, and an error is returned to the computer 12. Thus, an out-of-tracking state in which an error cannot be detected can be transmitted to the host system at the time of occurrence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing system for recording / reproducing predetermined information on an optical information recording medium.

[0002]

2. Description of the Related Art Conventionally, as an information recording medium, a floppy disk for recording / reproducing by using magnetism, an optical information recording medium for recording / reproducing by using light, etc. are known. Various types of optical information recording media are known, such as discs, cards, and tapes.
Depending on the purpose, use, etc., of which,
Card-shaped optical information recording media (hereinafter referred to as "optical cards") are expected to be used more and more in the future due to their features such as ease of manufacturing, portability, and accessibility. Depending on the characteristics of the medium, some information recording media can be erased and rewritable, but some optical cards are not currently erasable and rewritable. It is expected to be applied in fields such as the medical field where the inability to do things is an advantage.

In these optical cards, a plurality of tracking tracks are provided in parallel with the long side of the card, and a space between the two tracking tracks is generally used as a data track for recording information. Is. The tracking track is an automatic tracking (AT) that controls the information recording / reproducing light spot so as not to deviate from a predetermined data track when recording / reproducing information.
Used as a guide for. Further, in actual information recording / reproduction, autofocus (AF) is also used which controls so that the light spot is properly focused on the surface of the recording medium. These AT and AF are general techniques that have been used more frequently than before in an apparatus that records / reproduces information using light.

By the way, in such an optical card recording / reproducing apparatus, information is recorded / reproduced on the recording surface of the optical card by relatively reciprocating the optical beam for recording / reproducing with respect to the optical card. Generally, recording is performed on the outward path of this relative reciprocal motion, verification is performed on the return path, and reproduction is performed in both directions of the reciprocation.

[0005]

In the above-mentioned optical information recording / reproducing apparatus, the above-mentioned AT and AF are very important, and if the AT comes off during the recording of information, this should be avoided. If left unattended, in the worst case, there is a possibility of overwriting on the already recorded adjacent information, which may destroy the already recorded information. Therefore, a number of means for detecting AT disconnection have been conventionally proposed, for example, in Japanese Patent Laid-Open No. 3-272023.

However, when an abnormality occurs in these detecting means themselves, or when a light spot moves to an adjacent track in a very short time exceeding the detection sensitivity or detection speed, the AT is detected by these means. Assuming that the deviation cannot be detected, the recording / reproducing operation ends normally without any other error such as a verify error, and the abnormality cannot be detected.

If such a phenomenon occurs during the recording operation, as described above, at worst, the adjacent information already recorded is overwritten, and the already recorded information is destroyed. However, in general, adjacent information is likely to be recorded at the same time, and it is possible to save the destroyed information by re-recording it if it can be detected at the time when the error occurs.

Further, even if the adjacent information is previously recorded, if the information is backed up, the information can be quickly re-recorded, but the conventional information recording / reproducing method can be used. In, since the occurrence of an error cannot be detected at the time of occurrence, it becomes possible to detect the destruction of information only after reproducing the destroyed information, and at that time, the destroyed information and its backup information have already been lost.
There was a possibility that the destroyed information could not be restored.

Such a situation becomes a problem even when reproducing information. For example, when AT disconnection that cannot be detected by the AT disconnection detection means occurs during reproduction of a series of file data, even if the file reproduction operation itself ends normally, data on a certain track is reproduced. The data may not have been reproduced correctly because it may not have been able to detect that the light spot moved to another track, that is, some of the data may have been replaced by other data. .

When such a situation occurs, in the conventional information recording / reproducing system, the occurrence of the error can be judged only from the reproduced data itself, and the possibility of the error occurring is low, but it should occur. In that case, it was extremely difficult to detect the occurrence.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an information recording / reproducing system capable of promptly responding to an error even if an abnormality occurs in the AT out-of-range detecting means itself.

[0012]

According to the present invention, in an information recording / reproducing system in which information is recorded / reproduced using light on an optical recording medium having a plurality of data tracks, a track number detected before recording / reproducing. Is different from the track number detected after the end of recording / reproduction, it is determined that there is an AT failure that could not be detected, and an error is returned to the host device (initiator).

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a first embodiment of the present invention, an optical card is used as an information recording medium, and a host computer as an upper device and an information recording / reproducing device use SCSI (S
An example is given when connecting with a mall computer system interface).

FIG. 1 is a block diagram showing an example of a SCSI system according to the information recording / reproducing system in the first embodiment of the present invention.

In FIG. 1, SCS as a target
The I controller 5 is a SCSI protocol circuit (S that performs sequence control of SCSI signals based on the SCSI standard).
PC) 6 and R that stores various fixed data and programs
An OM 7, an MPU 8 for controlling the SCSI controller 5 according to a program stored in the ROM 7, and a RAM 9 used for storing a buffer memory for recording / reproducing data, storing sense data, and the like.

Information is recorded in the SCSI controller 5 /
A reproducing device 10 is connected, and an optical card 1 as shown in FIG. 3, for example, is inserted into the information recording / reproducing device 10. A host computer 12 is connected to the SPC 6 of the SCSI controller 5 via a SCSI bus 14 and a host adapter 13, and information recording and reproducing operations are performed based on commands from the host computer 12.

FIG. 3 is a plan view schematically showing the recording surface on the optical card 1.

In this optical card 1, a data track 3 for recording information is provided between each tracking track 2, and a physical track number 4 indicating the physical position of the data track is provided at both ends of the data track 3. Is pre-formatted in advance. The physical track number 4 is 0 on the lower end side of the optical card 1 and increases as it goes to the upper end side, and becomes 2499 at the uppermost end. That is, 2500 data tracks 3 are provided on the optical card 1.

The sectors on the optical card 1 correspond to the logical blocks of SCSI. The sector 1 of the physical track 0 is the logical block 0, the sector 4 is the logical block 3, and the sector 1 of the physical track 1 is the logical block 4. , Physical truck 24
Sector 4 of 99 corresponds to logical block 9999.

FIG. 4 shows C of the write command of group 0.
It is a schematic diagram which shows an example of DB (Command Descripter Block).

In FIG. 4, "Logical Unit Number"
Indicates the logical unit targeted by the command.
l Block Address "indicates the logical block executed at the beginning of the command, and" Transfer Length "indicates the number of logical blocks at which the command is continuously executed.

In FIG. 1, recording (WRITE, WRITE AND VE
When a RIFY) command and a reproduction (READ) command are issued from the host computer 12, the information recording / reproducing device 10 is indicated by "Logical Block Address" of the logical unit indicated by "Logical Unit Number" in the CDB of the command. Recording / reproduction of continuous logical blocks of the logical block number indicated by "Transfer Length" is executed from the logical block address.

The operation of the recording / reproducing system of this embodiment will be described below with reference to the flowchart of FIG. Note that, in the following, a case of recording or reproducing in only one logical block will be described as an example for simplicity.

First, in S101, a seek operation for detecting a physical sector corresponding to a target logical block is executed. That is, in S102, the optical head is moved to the track where the physical sector corresponding to the target logical sector exists,
In step S103, the physical track number 4 on the optical card 1 is read, and in step S104, it is checked whether or not there is a physical sector corresponding to the target logical sector. If they match, the process proceeds to step S105 to find a match. If not,
Returning to S102, the optical head is moved by the difference between the current position and the target position. In the above operations from S102 to S104, the physical track number read in S103 is S104.
The above process is repeated until it coincides with the track in which the physical sector corresponding to the target logical block exists.

As a result of the seek operation in S101, when a track in which a physical sector corresponding to the target logical block exists is found, in S105, the physical sector corresponding to the target logical block is followed by a command given from the host computer 12. The recording or reproducing operation is executed.

Next, after the end of recording / reproducing, S106
Then, the reading of the physical track number on the opposite side to the physical track number read in S103 before the recording / reproducing, that is, immediately before the recording / reproducing operation of S105 is executed,
Both are compared in S107. Then, if both of them match by comparison, it is checked in S108 whether or not there is another error. If there is no error, in S109, "good" is detected.
Initiator of status (host computer 12)
Return to.

If there is no match in S107, or if there is some other error in S108, S
At 110, for example, sense data as shown in FIG. 5 is created, and at S111, a "check condition" status is returned.

Then, after S109 or S111,
In step S112, the "command complite" message is returned, and the command processing ends.

Next, the sense data created in S110 of FIG. 2 will be described. FIG. 5 is a schematic diagram showing an example of sense data used in this embodiment, as described above.

In FIG. 5, "valid" indicates whether "Informantion Byte" of bytes 3 to 6 is valid. When "valid" = 1, "Informant Byte" is "Informant Byte".
"ation Byte" is valid. "Error Class" and "Eooro Code" indicate the format of sense data.
When “Error Class” = 7 and “Error Code” = 0, it indicates that the sense data is extended sense data.

Further, "Sense Key" indicates the type of error, and "Information Byte" indicates the location (logical block) where the error occurred. In addition, “Additional Sense
"Length" indicates the number of bytes of the additional sense data on and after byte 8, and "Sense Code" indicates detailed error information.

When the "check condition" status is returned from the target in response to the issued command, the initiator issues a "request status" command to receive the sense data created by the target, and then "Se
When "valid = 1", it is possible to know from the "Information Byte" what kind of error occurred from "nse Key" and "Sense Code".

When a command is given to a plurality of logical blocks, it is general that the target sets sense data when an error occurs and terminates the command with a "check condition" status. For example, in the case of a read command for five consecutive logical blocks of logical blocks 1 to 5, if a read error occurs while reading the logical block 3, the target sets the “Sense Key” in the sense data to 3h (Medium Error),
Set “Sense Code” to 11h (Read Error) and “Informatio
n Byte ”to 3 (logical block where the error occurred),
"Valid" is set to 1 to indicate that the information byte is valid, and "checkcondition" is set.
"Return status.

The initiator receives the sense data by the "request status" command and
By issuing the read command again from the logical block 3 indicated by "e", it is possible to retry the error.

On the other hand, in this embodiment, if the physical track number read before recording / reproducing does not match the physical track number read after recording / reproducing, "Sense" is set.
Set "Key" to 4h (Hardware Error) and set "Sense Cod
Set "e" to 85h (Track ID Unequal Error), set "Information Byte" in the sense data to the first logical block address where the command could not be executed normally due to this error, and set "valid". Set to 1 to indicate that the information byte is valid and return the "check condition" status.

Of course, when the command is given to only one logical block, the logical block targeted by the command is set in "Information Byte".

The initiator receives the sense data by the "request status" command, and when the sense code is 85h, it judges that the undetected AT has occurred during the recording or reproducing operation. In this case, if the issued command is a reproduction command, the initiator can retry the error by issuing the reproduction command again with the logical address indicated in the "Information Byte".

On the other hand, in the case of recording, as described above, there is a possibility that overwriting may have occurred in adjacent information that has already been recorded, and the worst information may be destroyed. According to the information recording / reproducing method of No. 3, it is possible to notify the initiator of the occurrence of an error when such a situation occurs, and if the destroyed information is the one recorded this time, re-recording may be performed. It is possible, and even if it was recorded before, if there is a backup of the information, it is possible to promptly respond such as re-recording the information. Even if there is no worst backup information, it is possible to take measures such as reissuing the optical card as an optical card in which an accident has occurred, when the error occurs.

In the above embodiment, the case where the information recording medium is an optical card has been described, but it goes without saying that the present invention can be applied even when the information recording medium is an optical disk. Further, in the above embodiment, the host computer, which is a higher-level device, and the information recording / reproducing device are SCSI.
However, it is clear that the interface configuration between the host device and the information recording / reproducing device does not limit the present invention.

Next, a second embodiment of the present invention will be described.

SCSI is an interface SAS that connects a small computer manufactured by Sugart Inc. of the United States and its peripheral devices.
AN based on I (Shugart Associates System Interface)
Deliberated by SI (American National Standards Institute) X3T9.2 Working Committee
It was standardized as ANSI X3.131-1986, and is now becoming the standard interface connecting personal computers and their peripheral devices. Further, recently, work for standardization of SCSI-2, which is an extension of the work, is being promoted, but at present, the final decision has not been reached.

The range of the SCSI interface standard defined by ANSI is the following five points.

(1) Interface signal types and their definitions, signal transmission / reception timings (2) Protocols that define the operation sequence as an interface, definitions of each phase, etc. (3) Physical interface conditions such as cable specifications and connector specifications , Electrical conditions of transmission system (4) Command system for executing various controls of peripheral devices and data transfer, command format and function of each command (5) Status byte for notifying host computer of command execution result Format and structure of sense data for notifying an abnormal state in the process The command system in (4) above is as follows.

SCSI commands are divided into eight types of groups. The first byte of the CDB (Command Descripter Block) is the operation code, and the upper 3
The bits specify the group code, and the lower 5 bits specify the command code (code indicating the type of command) for each group.

The length of the CDB is defined as follows for each group.

(1) Group 0 ... 6 bytes (2) Group 1 ... 10 bytes (3) Groups 2-3 ... Reserved (4) Group 5 ... 12 bytes (5) Groups 6 to 7 ... Vendor unique (manufacturer's rule) The CDBs of the groups 6 to 7 are command groups that can be defined uniquely to the SCSI device.

In each command, in the logical block address, fixed-length data blocks are continuously arranged on the logical unit.

FIG. 9 is a schematic diagram for explaining the configuration of logical blocks in the hard disk device. In FIG. 9, the data block of cylinder = 0 and sector = 0 is set to logical block address = 0, and the logical block address is incremented by one each time the sector, the track, and the cylinder are incremented by one.

The advantage of this logical block address is that the initiator (host computer) accesses the data by designating the logical block address of the first data block and the number of processing blocks, so it is necessary to be aware of the physical structure. There is no point. Therefore, by using the above logical block addressing, it is possible to operate with the same software when devices having different numbers of cylinders, tracks, sectors, etc. are connected.

FIG. 10 is a block diagram showing a general configuration example of a SCSI system.

As a logical unit, usually, a physical device such as a hard disk is often connected as shown in FIG. 10, but the logical unit number (LUN: Logi
calUnit Number) may be assigned to a physical device or a virtual device. Normal SC
In SI, LUN = 0 to 7 on the SCSI bus 8
One logical unit can be connected, and further, by using the extended message, a maximum of 2048 logical units can be connected.

Also, the CD of the write command of group 0
B has, for example, the configuration shown in FIG.
“Logical Bloc” of the logical unit indicated by it Number
From the logical block address indicated by "k Address" to "Tr
Recording is made in consecutive logical blocks of the logical block number indicated by "ansfer Length".

In the SCSI interface, the target returns a "good" status to the initiator if the command completes successfully. On the other hand, when the command ends abnormally, the "check condition" status is returned and the sense data as shown in FIG. 5 is created. This operation is as described in the first embodiment.

By the way, as described above, it is general that an optical card cannot be erased and rewritten, but here, a write command for a plurality of blocks is issued to such an optical card, and a one-track It is assumed that the AT comes off while recording a certain logical block (sector). In this case, the logical block address where the AT is off is set to "Inform
ation Byte ”, the initiator tries to retry (write in this case) from that logical block, but some kind of recording (guarantee that it is normally recorded) was made in that logical block before the AT came off earlier. However, normal recording cannot be expected because it will be overwritten on it.

Similarly, write-and-verify
Assuming the case of the (Write and Verify) command, when a plurality of logical blocks (sectors) are arranged on one track like an optical card or an optical disk, the operation of writing and verifying for each sector is repeated. Therefore, in the logical block range designated by the CDB of the command, the logical blocks existing in the same track are written at one time and then verified at one time, that is, the processing time is shortened by processing for each track. This method is used.

However, the AT is being executed during the write operation of the write-and-verify command for performing such processing.
If is removed, the following problem occurs in addition to the same problem as the above write command. That is, A
Although the recording operation was performed on the logical block recorded by the time T was removed, the verify operation was not performed, so that there is no guarantee that the data was correctly recorded.

As described above, in the information recording / reproducing system of recording / reproducing predetermined information on the information recording medium based on the instruction from the host computer via the conventional SCSI, the initiator should retry next. Since there is only "Information Byte" as the information for judging the block and the logical block address where the actual error occurred was set in "Information Byte", the write command, write and If an error occurs in a command that involves a recording operation such as a verify command, "Information Byte"
In some cases, the information set in the field may not be effectively useful as information for the retry performed by the initiator, and there is a disadvantage that the retry process at the time of error is wasted and the processing time is increased.

Therefore, information recording / solving the above-mentioned drawbacks
As a reproducing method, the applicant records information on the information recording medium in the information recording / reproducing method of recording / reproducing predetermined information on the information recording medium based on a command from the host computer via SCSI. If an error occurs during the execution of the command with the action, “check condit
The command ends with the "ion" status, and the information byte in the sense data sets the logical block address in which the error occurred first when viewed as a command, and the last logical block recorded is the information byte in the sense data. It proposes an information recording / reproducing system in which the byte is set to a different byte (Japanese Patent Application No. 3-205660).

According to this method, it is possible to give the last block, which is useful for the initiator to retry and which has actually finished recording, as information, and the initiator obviously writes a block in which a write error (double writing) occurs. In the case of a command that performs a composite operation such as a write-and-verify command, the same information as the information recorded in the block where the recording process is completed is retried to another location. Therefore, it is possible to reduce the processing time without performing a wasteful retry such as recording in the above.

By the way, in the above method,
In the write command for recording the predetermined information, if the AT comes off after the recording of the entire specified range is completed, the write command confirms whether or not the information was properly recorded after the recording is completed. Unlike the verify command, it is a command that only records information. Therefore, if recording of all information is completed, the command will end normally even if the AT comes off.
The command ends with the d "status, and the sense data is not set. This is also the case when the AT comes off after the end of recording and verifying all the information by the write and verify command.

However, when the cause of the AT failure is scratches, dust, etc., the recording / reproduction on the optical card is generally performed in one direction as described above and in both directions. When a track that is out of AT after recording is reproduced from the direction opposite to that during recording, there is a possibility that the AT may be separated due to the scratches, dust, or the like before or during reproduction. Of course, in this case, if you play from the same direction as when recording,
Although the AT will come off after the end of the reproduction, there is no problem in reproducing the information. However, if the recorded information is continuously reproduced after that, the operation of reapplying the AT is required, and it takes time to access the information. There is a problem of cost.

Therefore, in the second embodiment, if an AT out-of-error occurs after the completion of the command for recording the predetermined information on the optical information recording medium, the information byte is invalidated and the sense data is stored. By setting the last logical block that has been recorded in a byte different from the information byte of, and ending the command with the "check condition" status, there was a situation in which the access time increased when the recorded information was reproduced. It is possible to notify the user of
It gives the freedom to choose how to deal with the situation.

That is, if the user thinks it is better to re-record, a command for re-recording (retry) is issued,
On the contrary, since there is a possibility that the data can be reproduced without any problem during the reproduction (depending on the reproduction direction), the user can be provided with the option of shifting to the next processing if he / she thinks that it is acceptable.

The case where the information recording medium is the optical card shown in FIG. 3 will be described below as an example. The system configuration is the same as that shown in FIG.

FIGS. 7 and 8 are schematic views showing the recording state on the optical card 1 for explaining the information recording / reproducing system of the second embodiment. 7 and 8, the solid line rectangles indicate the recorded logical blocks (sectors), the dotted line rectangles indicate the unrecorded logical blocks, and the numbers in the rectangles indicate the logical block addresses. Indicates where the error occurred.

Here, in FIG. 7, data has already been recorded in logical blocks 0 to 3, and the host computer 12 sends logical blocks 4 to 7
Assume that a write command of 4 blocks up to is issued. In this case, if the recording of all the logical blocks is normally completed and the AT does not come off even after the recording is completed, the SCSI controller 5 returns the “good” status to the host computer 12 via the SCSI bus 14.

After recording the logical block 7, the AT
Is removed, in this case, the SCSI controller 5
Sets the sense data in the RAM 9 and sends "check condit" to the host computer 12 via the SCSI bus 14.
Ion "status is returned. If the AT comes off during the recording operation, it is omitted (Japanese Patent Application No. 3-205660).
No.).

FIG. 6 is a schematic diagram showing sense data used in the recording / reproducing system of this embodiment. In the recording / reproducing method of the present embodiment, when an error occurs during the execution of a command accompanied by a recording operation, “Informantion Byte” in the sense data to be set indicates “the error occurs first when viewed as a command. Set block,
It is recommended that the “Last Written Block” be set to “the last logical block in which recording (recording is assumed to be executed even if recording was interrupted due to an error etc.)” Although it is the same as the content disclosed in No. 3-205660, even if the AT comes off after the completion of the command accompanied by the recording operation, “In
Invalidate the "formation Byte"("valid" = 0),
The difference is that the last recorded logical block is set in "Last Written Block".

Further, in FIG. 6, "valid" of bit 7 of byte 14 indicates whether or not "Last Written Block" is valid. When "valid" = 1,
“LastWritten Block” is valid. In the example of FIG.
“Last Written Block” is set to 7. In addition,
"Sense Key" is 3h (Medium Error), "Sense Code"
Indicates AT failure 09h (Focus / Tracking Servo Failur
e) is set.

Similarly, with the write and verify command, AT is recorded after the recording and verification of all blocks is completed.
If the value is off (see Fig. 8), "Inform" in the sense data
ation Byte ”is invalid (“ valid ”= 0) and“ La
Set the last recorded logical block (7 in this case) to "st Written Block". "Sense Key", "Se"
The “nse Code” is the same as in the case of FIG. 7 described above.

[0071]

As described above, according to the present invention,
If the track number detected before recording / playback is different from the track number detected after the end of recording / playback, it is judged that there was an AT failure that could not be detected and an error is returned to the host device. AT not detected
The occurrence of disconnection can be notified to the host device at the time of occurrence, and there is an effect that quick response to an error is possible.

Further, according to the present invention, when the error of out of auto-tracking occurs after the execution of the command for recording the predetermined information on the optical information recording medium, the information byte is invalidated and recording is performed. By setting the last logical block to a byte different from the information byte in the sense data and terminating the command with the check condition status, the user may be informed that the access time is increased when the recorded information is reproduced. Can be notified, and the user is given the freedom to choose how to deal with the situation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the first embodiment.

FIG. 3 is a plan view schematically showing a recording surface on the optical card in the first embodiment.

[Fig. 4] Group 0 in the SCSI interface
FIG. 6 is a schematic diagram showing an example of a CDB of the write command of FIG.

FIG. 5 is a schematic diagram showing an example of sense data used in the first embodiment.

FIG. 6 is a schematic diagram showing an example of sense data used in the second embodiment of the present invention.

FIG. 7 is a schematic diagram showing a recording state on the optical card in the second embodiment.

FIG. 8 is a schematic diagram showing a recording state on the optical card in the second embodiment.

FIG. 9 is a schematic diagram illustrating the configuration of logical blocks in a hard disk device.

FIG. 10 is a block diagram showing a general configuration example of a SCSI system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical card, 5 ... SCSI controller, 6 ... SCSI protocol circuit, 7 ... ROM, 8 ... MPU, 9 ... RAM, 10 ... Information recording / reproducing device, 12 ... Host computer, 13 ... Host adapter, 14 ... SCSI bus .

Claims (2)

[Claims] 1. An information recording / reproducing system for recording / reproducing information using light on an optical recording medium having a plurality of data tracks, wherein the track number detected before recording / reproduction and the track detected after the end of recording / reproduction. An information recording / reproducing system characterized in that an error is returned to a higher-level device when the numbers are different. 2. An information recording / reproducing system for recording / reproducing predetermined information on an optical information recording medium on the basis of a command sent from a host computer via SCSI, wherein the information is recorded on the information recording medium. If an error occurs during execution of a command that involves the operation of recording, the command ends with a check condition status, and the information byte in the sense data contains the logical block address where the error occurred first when viewed as a command. In the information recording / reproducing method of setting and setting the last recorded logical block to a byte different from the information byte in the sense data, execution of a command to record predetermined information on the optical information recording medium is completed. If you get an auto-tracking error later, And disable the Activation bytes,
Set the last recorded logical block to a byte different from the information byte in the sense data,
An information recording / reproducing system characterized by terminating the command in the check condition status.