JPH08335373A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE: To improve the reliability of information already recorded by storing the information of the block existing adjacent to the block which records information in a buffer inside the information recording and reproducing device. CONSTITUTION: The above device 14 is composed from an MPU 6, a modulating/ demodulating circuit 5, a semiconductor laser driving device 9, and an AT/AF control circuit 9 which conducts auto tracking control and auto focussing control. An interface 2 which controls the device 14 by the commands from the host computer 1 is provided with a buffer RAM 3 which stores recording and reproducing information in it. The reliability at the time of recording and reproducing information is improved by storing the information on the final recording position (EOT) which is Track-1 track to be recorded with new information and the EOT+1 track into the recording information storing region inside the buffer RAM 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is connected to an external device and records on a write-once type information recording medium according to a command from the external device.
Alternatively, the present invention relates to an information recording / reproducing apparatus that reproduces recorded information.

[0002]

2. Description of the Related Art Conventionally, as a medium of a write-once type information recording / reproducing apparatus which is connected to an external apparatus and records or reproduces the recorded information in accordance with a command from the external apparatus, a disk-shaped or card-shaped medium has been used. There are various ones. Of these, card-shaped recording media, especially those that use semiconductor lasers for recording and playback (hereinafter referred to as optical cards), are
As a medium for recording medical information and personal information, it is compact and lightweight, convenient to carry, and has a relatively large capacity.
Great demand is expected. Here, taking an optical card as an example, a structure, a method of recording and reproducing information will be described.

FIG. 10 is a schematic plan view showing an example of an optical card, and FIG. 11 is a sectional view taken along the line BB. In these figures, 4 indicates an optical card, the surface of which is roughly classified into an information recording area 22 and a blank area 23 other than the area.
Consists of An appropriate character or logo 24 such as a picture can be attached to the blank area 23 so that the user can visually judge the type and purpose of the optical card. Information recording area 2
In FIG. 2, a plurality of preformatted tracking tracks 26 are arranged in parallel for automatic tracking. An information track 25 in which information is recorded is provided between adjacent tracking tracks 26.

As shown in FIG. 11, the optical card 4 is composed of a plurality of layers. 27 is a transparent protective layer,
28 is a recording layer. The recording layer 28 is, for example, a silver salt type,
Dye type or chalcogen type and the like. Also,
The boundary between the protective layer 27 and the recording layer 28 has a stepped shape, whereby the tracking track 26 and the information track 25 are formed. Reference numeral 30 denotes a substrate, and the substrate 30 and the recording layer 28 are joined by an adhesive layer 29.

Information is recorded on the optical card 4 as described above by modulating a light beam focused into a minute spot according to the recording information and scanning the modulated light beam on an information track. Then, the information is recorded as an optically detectable information bit string. Since this information bit string is formed by a physical change such as deformation or discoloration due to light and heat, it is possible to physically erase the once recorded information bit string and use the erased information bit string area again as a recording area. It is impossible.

Next, the structure of the information recording / reproducing apparatus for recording / reproducing information on / from the optical card 4 will be described. FIG. 13 is a block diagram showing an example of an optical card information recording / reproducing apparatus. As shown in the figure, an optical card information recording / reproducing apparatus (hereinafter referred to as apparatus) 14 is controlled by a host computer 1 which is an external control apparatus via an interface 2 to perform a recording / reproducing operation. The device 14 includes an MPU 6 that controls each part of the device, a modulation / demodulation circuit 5, a semiconductor laser driving device 9, and an AT / AF control circuit 8 that performs auto tracking control and auto focusing control. A
The T / AF control circuit 8 is equipped with an auto-tracking error detection circuit as disclosed in Japanese Patent Laid-Open No. 1-59640. When an auto-tracking error is detected, an interrupt signal is sent to the MPU 6. . Further, a pulse motor 11 for driving the optical head 10 in the track crossing direction of the optical card 4 and a DC for sending the optical card 4
A motor 13 and an encoder 12 attached to the DC motor 13 for detecting the feed amount are incorporated. Further DC
It is composed of a PLL circuit 7 that controls the motor 13 to rotate at a constant speed.

Next, a method of managing the information recorded on the optical card 4 will be described. Generally, the information recorded on the card 4 is managed by recording the information for managing the information, and when recording new information,
Information for managing information (hereinafter referred to as directory)
The information recording position is determined based on. The directory is additionally recorded in an area different from the recording information. FIG. 12 is a conceptual diagram showing the positional relationship between the recorded information on the card and the directory. In the figure, 31 is an area where information is recorded, and 33
Shows the recorded information track. Reference numeral 32 indicates a directory recording area, and reference numeral 34 indicates a recorded directory. The device reads the directory 34 while the optical card 4 is inserted and the recording / reproducing command is issued from the host computer 1, and based on the read directory 34, the recording information managed in the directory 34 is read or the directory 34 is read. A recording / reproducing process such as writing information managed by is performed.

[0008]

As described above, the recording on the optical card as the information recording medium is performed by physically changing the track on the card by the semiconductor beam, so that the recording is completed. If the semiconductor beam is erroneously scanned on the track, the recorded information will be lost. Especially, the track interval on the optical card is several μ.
Because of the distance and because the optical head and the optical card are not in contact at the time of recording, there is a possibility that the optical beam may deviate from the currently scanning track and move to an adjacent track due to external vibration. . For this reason, a device that absorbs vibration is used for the device, and processing such as stopping the emission of the light beam when an auto-tracking error in which the light beam deviates from the track is detected is performed. It improves the sex.

However, when the light beam deviates from the currently scanning track due to a sudden vibration from the outside, information is recorded on the adjacent recorded track before the process of stopping the light beam emission is performed. There is a possibility of doing it. Therefore, due to the movement of the light beam, even when the light beam scans the recorded information track,
Although the reliability of recorded information is improved by adding an error correction code to the recorded information, erroneous recording exceeding the error correction capability of the error correction code can be performed on the information track on which the light beam has been recorded. If done, there is a possibility that the recorded information will be lost.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to improve reliability of recorded information and to enable a light beam to scan a recorded information track. Is to prevent the recorded information from being lost. In order to achieve the above-mentioned object, in the present invention, the information of the block existing adjacent to the block for recording the information is stored in the information recording / reproducing apparatus. When the information is stored in the buffer and the recorded information is lost by the light beam deviating from the track where the information is recorded due to a sudden vibration from the outside when recording the information and the light beam scans the adjacent track. Then, the data in the buffer in the apparatus is re-recorded in the unrecorded area.

Specifically, in an information recording / reproducing apparatus which is connected to an external apparatus and records / reproduces information on / from an information recording medium in response to a command from the external apparatus, at least twice as many recording units as in the external apparatus. A memory having a capacity is provided, and at the time of recording information, the recording unit block adjacent to the information recording position in parallel with the recording direction is stored in the memory together with the information to be recorded, and the recording position due to the tracking error is recorded. When the information of the recording block adjacent to the information recording position is lost due to the fluctuation, the lost information from the information in the memory is re-recorded on the medium.

Further, in the above information recording / reproducing apparatus, the information recording medium is a write-once medium. Furthermore, in the information recording / reproducing apparatus, the information recording medium has a plurality of parallel tracks on the medium surface,
It is an information recording medium for recording on the track. Further, in the above information recording / reproducing apparatus,
The re-recording of the information is performed on an alternative recording block managed by the device on the information recording medium.

[0013]

Operation: The information content of at least two tracks is scanned and recorded in the memory in block units, and a memory having at least twice the capacity of the recording unit is provided in the external device to perform recording at the time of information recording. When the recording unit block adjacent to the information recording position in parallel with the recording direction is stored in the memory together with the information, and the information of the recording block adjacent to the information recording position is lost due to the change of the recording position due to the tracking error. In addition, the information lost from the information in the memory is re-recorded on the medium.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an information recording / reproducing apparatus (hereinafter referred to as an apparatus) embodying the present invention. In FIG. 1, 1 is a host computer that is an external control device, and 2
Is an interface for controlling the information recording / reproducing apparatus 14 by a command from the host computer 1, and a buffer RAM 3 for storing information for recording / reproducing is provided in the interface 2. The device 14 includes an MPU 6 that controls each part of the device, a modulation / demodulation circuit 5, a semiconductor laser driving device 9, and an AT / AF control circuit 8 that performs auto tracking control and auto focusing control. The AT
The / AF control circuit 8 is equipped with an auto-tracking error detection circuit as disclosed in Japanese Patent Laid-Open No. 1-59640, and when an auto-tracking error is detected, an interrupt signal is sent to the MPU 6. . Further, a pulse motor 11 for driving the optical head 10 in the track crossing direction of the optical card 4 and a D for transferring the optical card 4
The C motor 13 and the encoder 12 attached to the DC motor 13 for detecting the feed amount are incorporated. Furthermore D
PLL that controls the C motor 13 to rotate at a constant speed
It is composed of a circuit 7.

FIG. 7 shows a block diagram of the buffer RAM 3 in FIG. In FIG. 7, 16 is a storage area for storing the information already recorded on the optical card and the information to be newly recorded, and the area 15 is the information for managing the information recorded on the optical card. A directory storage area for storing a certain directory. The directory is read from the directory recording area immediately after the optical card 4 is inserted into the device or immediately before the information is first recorded on the inserted optical card 4, and is stored in the directory storage area 15.

When information is recorded on the optical card 4, the final recording position of information recorded on the optical card 4 (hereinafter referred to as EOT (: End Of Trac
k). ) Is searched.

2 to 5 are flow charts showing a recording operation of information in the apparatus embodying the present invention, and a record information storage area in the buffer RAM used based on the flow chart shown in FIG. Figure 8 shows the configuration of
Shown in In FIG. 8, 16 is a recording information storage area, and 17
Is an EOT recording information storage area to be recorded in the EOT, and 18 is an EOT + 1 track recording information storage area in which information for recording on the EOT + 1 track of the optical card 4 is stored.

First, when the interface 2 receives an information recording command from the host computer 1, the buffer RA stores information of EOT which is a track-1 track to be newly recorded and EOT + 1 track to be newly recorded.
Store in the recording information storage area 16 in M3 (step 1
01). It is determined whether the received command is a directory recording command (step 102). If it is a directory recording command, the information stored in the EOT + 1 track record information storage area 18 is recorded as directory information (step 102). After the processing result is notified to the host computer 1 via the interface 103 (step 115), the processing is terminated. If the received command is not a directory recording command, the information stored in the EOT + 1 track recording information storage area 18 is recorded (step 104). Next, the presence / absence of an interrupt indicating the automatic tracking error from the AT / AF control circuit 8 to the MPU 6 during the recording of information and the presence / absence of the recording error are judged from the result of reproducing the recorded information immediately after recording (step 105). ), If no recording error occurs, the processing result is notified to the host computer 1 (step 115), and the processing ends.

When a recording error occurs, whether the error is an auto tracking error or not is detected by the AT to the MPU 6.
/ Judge from the presence or absence of an interrupt signal indicating an auto tracking error from the AF control circuit 8 (step 106),
If it is not an auto tracking error, the information in the EOT + 1 track recording information storage area 18 in which the recording error has occurred is recorded at the alternative recording position managed by the device on the information recording medium (step 110), and the processing result is recorded in the host computer 1.
(Step 115), the process ends.

Here, as an alternative recording device managed by the device on the information recording medium shown in this embodiment, for example, FIG.
A method of securing a certain number of tracks between the information recording area 31 and the directory recording area 32 on the optical card shown in (4), or recording can be performed adjacent to the last track currently recorded in the information recording area 31. For example, there is a method of using a different track. In the alternative recording directory information, the track number in which the recording error occurred and the alternative recording number of the track are recorded. Also,
When a recordable track adjacent to the last track currently recorded in the information recording area 31 is used as the alternative recording position, only the track information in which the recording error has occurred is recorded, and the directory information is reproduced at the time of reproducing the information. Therefore, the record information can be obtained by replacing the information in the track in which the recording error has occurred with the information in the track in which the alternative recording is performed.

Next, if one of the information recording errors is an auto tracking error, the recording process is stopped (step 107), and the recorded track-1 track, that is, the current EOT is reproduced ( Step 108),
It is determined whether or not an information reproduction error has occurred (step 10).
9). If no playback error has occurred, EOT +
The information in the one-track recorded information storage area 18 is recorded at an alternative recording position managed by the device on the information recording medium (step 1
10) After notifying the host computer 1 of the processing result (step 115), the processing ends.

When an information reproduction error occurs, the information shown in FIG.
Referring to the EOT stored in the recording information storage area 16
Based on the information in the recording information storage area 17 and the EOT + 1 track recording information storage area 18, the information on the EOT and EOT + 1 tracks is recorded at the alternative recording position managed by the device on the information recording medium (step 111). Next, the directory information in the directory storage area 15 is searched to determine whether or not the directory for managing the information in which the reproduction error has occurred is already recorded. If the directory information is not recorded, the processing result is notified to the host computer 1. (Step 115)
The process ends. When the directory is recorded, the contents of the directory for managing the information of the EOT in which the reproduction error has occurred are reconstructed based on the error information for the EOT and the information recorded in the alternative (step 113).
After re-recording the directory that manages
4) The processing result is notified to the host computer (step 115), and the processing ends.

Next, the directory recording method in the above embodiment will be described with reference to FIG. When the directory recording command shown in step 103 of FIG. 2 and step 114 of FIG. 3 is received, the directory to be recorded is first searched from the directory storage area 15 (steps 116 and 117), and the directory storage area 15 with the same name is searched. If the directory exists, the information in the directory storage area 15 is rewritten (step 11).
8). If there is no directory with the same name in the directory storage area 15, directory information is added to the directory storage area 15 (step 119) and the directory information is recorded on the optical card (step 120). Next, A to MPU6 during recording of information
The presence / absence of an interrupt indicating an auto-tracking error from the T / AF control circuit 8 or the presence / absence of a recording error is determined from the result of reproducing recorded information immediately after recording (step 121). If no recording error occurs, the process is performed. Notify the result to the host computer 1 (step 115 in FIG. 2),
The process ends.

When a recording error occurs here, it is determined whether the error is an auto tracking error or not.
Judging from the presence or absence of an interrupt signal indicating an auto-tracking error from the AT / AF control circuit 8 to 6 (step 122), if it is not an auto-tracking error, the directory information in which the recording error has occurred is re-recorded. If the error is an auto-tracking error, the recording process is stopped (step 123), and the recorded track-1 track is reproduced (step 12).
4) It is determined whether or not an information reproduction error has occurred (step 125). If no reproduction error has occurred, the directory is re-recorded. When an information reproducing error occurs, the recording directory is set to be the directory in which the recording is attempted to be recorded + the directory in which the information reproducing error has occurred (step 126), and the directory is recorded again.
In this way, the process proceeds to step 116 again, it is judged whether or not an information recording error has occurred (step 121), and if there is no error, the process ends.

[Embodiment 2] In the above Embodiment 1, the information stored in the recording information storage area is two tracks of EOT and EOT + 1 for the sake of simplification of description. However, since the light beam moves a plurality of tracks, The case where there is a possibility of information loss with respect to information on a plurality of adjacent tracks will be described.

In the structure similar to that of FIG. 1 described in the first embodiment, it is assumed that the capacity of the buffer RAM 3 can store the track number and the directory for the track number + 1 where the light beam may move, and the information. Information of at least two or more adjacent tracks at the time of recording is stored in the recording information storage area 16, and when an auto tracking error occurs, the track to be reproduced is not limited to the EOT, and even for the adjacent tracks. Play
By determining whether or not there is a reproduction error, the reliability of a plurality of adjacent recorded information is improved. In this case, in the flow charts shown in FIGS. 2 and 3, for example, EOT and EOT + 1 are replaced with n and n + 1. If no error has occurred due to the information recording error in step 105, the process proceeds to step 110 and step 110 The information of n + 1 track is recorded on the next track, the alternative recording process is omitted, and the information is recorded on the optical card as much as possible. [Third Embodiment] In the first and second embodiments, an example in which the present invention is applied to the case where information is recorded in track units is described. However, the information recording unit is an integral part of the capacity of one track. It is possible to apply the present invention also to the case of 1. In particular, similar to the first embodiment, the vicinity of the EOS (End of sector) sector area will be described.

FIG. 5 and FIG. 6 are flowcharts for carrying out the present invention when one track is divided into a plurality of areas and information is recorded in each divided area (hereinafter referred to as a sector). FIG. 9 shows the contents of the recorded information storage area in which this embodiment is implemented. In FIG. 9, the recording information storage area 1
6 has an area for storing sector data in a track adjacent to a track including a final recording sector EOS + 1 sector in a block 19 and 20, and 20 stores sector recording information for storing information recorded in the sector. Area, 1
A sector number storage area 9 indicates a sector number. EO
Information for recording in the S + 1 sector is stored in the EOS + 1 sector recording information storage area indicated by reference numeral 21 in FIG.

In FIG. 5, the information recording / reproducing apparatus 14 is
When an information recording command is received from the host computer 1 via the interface 2, first, the information of the track-1 track where the EOS + 1 sector exists, that is, the track adjacent to the EOS + 1 sector and the information to be recorded in the EOS + 1 sector are recorded in the buffer RAM 3. Information storage area 16
(Step 201). At this time, the sector information is stored in the sector information storage area 20 in FIG.
The information is stored in the track adjacent to the OS + 1 sector in correspondence with the position where the information in the sector exists, and the sector number is stored in the sector number storage area 19 based on the information of the directory for managing the data. Sector recording information storage area 2
In the sector information for one track stored in 0, if there is a sector that is not managed by the directory due to a recording error, it indicates that the sector is not managed by the directory and the sector that does not exist in the sector number storage area 19 For example, the sector number “−1” is stored as the number. Next, it is judged whether or not the received command is a directory recording command (step 202), and if it is a directory recording command, the information stored in the EOS + 1 sector recording information storage area 21 as EOS + 1 sector recording information is determined. After recording in the directory recording area (step 20
3) Then, the processing result is notified to the host computer 1 via the interface 2 (step 216), and the processing ends.

If the received recording command is not the directory recording command, information is recorded in the EOS + 1 sector (step 204). M during recording of information
It is determined whether or not there is an interrupt indicating an auto tracking error from the AT / AF control circuit 8 to the PU 6, and whether or not an error has occurred during information recording from the result of reproducing the recorded information immediately after recording (step 205), If no error occurs, the processing result is notified to the host computer 1 (step 216) and the processing is ended.

When a recording error occurs, the AT to the MPU 6 is checked to see if the error is an auto tracking error.
/ Judge from the presence or absence of an interrupt signal indicating an auto tracking error from the AF control circuit 8 (step 206),
EOS + 1 if it is not an auto tracking error
The information recorded in the sector is recorded in the alternative recording position managed by the device on the information recording medium (step 210), and the processing result is notified to the host computer 1 (step 21).
6), end the process.

When an auto-tracking error occurs, the recording process is stopped (step 207), and then EO
Play the track adjacent to S + 1 (step 20
8) It is judged whether or not an information reproduction error has occurred (step 209). If no information reproduction error has occurred, steps 210 and 216 are executed, and the process ends. When an information reproduction error occurs, the process proceeds to FIG. 6 and it is first determined from the sector number shown in the sector number storage area 19 whether or not the sector information in which the information reproduction error has occurred is managed by the directory ( If not managed by the directory in step 211), the information recorded in the EOS + 1 sector is recorded in the alternative recording position managed by the device on the information recording medium (step 210), and the processing result is stored in the host computer 1. A notification is given (step 216), and the process ends.

When managed by the directory, the sector in which the information reproduction error has occurred and EOS + 1
The information recorded in the sector is recorded in the alternative recording position managed by the device on the information recording medium (step 212). Next, it is determined whether or not the directory for managing the sector in which the reproduction error has occurred is already recorded in the directory storage area 1
Judging from the directory information stored in step 5 (step 213), if the directory is not recorded, the processing result is notified to the host computer 1 (step 216) and the processing is terminated.

If the directory has already been recorded, the contents of the directory for managing the sector in which the reproduction error has occurred are reconstructed based on the error information for the sector and the information recorded in the alternative (step 214), and the reproduction error occurs. After re-recording the directory for managing the sector on the optical card 4 (step 215), the processing result is notified to the host computer 1 (step 216), and the processing ends.

[Embodiment 4] In the above-described Embodiment 3, the information stored in the recording information storage area is the last part of the sectors such as EOS and EOS + 1 for the sake of simplification of the description. A case will be described in which the possibility of information loss with respect to information on an adjacent track including a plurality of adjacent sectors is caused by moving.

In the configuration similar to that of FIG. 1 described in the third embodiment, it is assumed that the capacity of the buffer RAM 3 can store the sector number and the directory for the sector number +1 where the light beam may move and the information. , Information of at least two or more adjacent sectors at the time of recording information is recorded in the sector number storage area 19 of the recording information storage area 16.
And the sector to be recorded in the sector recording information storage area 20, and when the auto tracking error occurs, the sector to be reproduced is EOS + 1.
However, the reliability of a plurality of adjacent recorded information is improved by performing reproduction also on a plurality of adjacent sectors and determining the presence or absence of a reproduction error. In this case, in the flow charts shown in FIGS. 5 and 6, for example, EOS and EOS + 1 are replaced with n and n + 1, and if no error has occurred due to the information recording error in step 206, the process proceeds to step 216, and step It is assumed that 210 records information of n + 1 sector in the next sector, omits the alternative recording process, and records the information in the optical card as much as possible.

In the above embodiment, the case of recording information has been described, but the case of reproducing by the information recording / reproducing apparatus will be briefly described. First, the optical card 4 is inserted into the device, and the host computer 1 to the interface 2
When a playback command for a predetermined plurality of sectors is received via
The PU 6 scans the optical head 10 via the AT / AF circuit 8, reads the information in the directory part of the optical card corresponding to the directory of the commanded sector, and scans the information track stored in the information in the directory. To do.
Then, the read information from a predetermined sector in the information track is demodulated via the semiconductor laser drive circuit 9 into data that can be handled by the host computer 1 at the modulation / demodulation circuit 5, and is sent to the host computer 1 via the interface 2. Send out.

Further, although the optical card has been described in the above embodiment, there are various media such as a magneto-optical card, an optical disk, a magneto-optical disk, and an IC card in which a semiconductor memory is recorded in a sector unit as the information recording medium. The above recording medium can be applied to the case of the recording error or the recording capacity excess according to the present invention, and is not limited to the above embodiment. In particular, according to the present invention, the present information recording medium is excellent when it is a non-rewritable write-once write-once type recording medium.

Further, in the above embodiment, the buffer RAM is housed in the interface section outside the information recording / reproducing apparatus, but this temporary storage medium may be arranged in the information recording / reproducing apparatus. Further, in the above embodiment, an example in which recording is performed for each track and each sector has been shown, but this means that the recording block is handled by a certain unit, and the present invention can be applied to a smaller recording unit. It can be applied and the same effect can be obtained.

[0040]

As described above, according to the present invention,
When recording information on the information recording medium, the information of the block existing adjacent to the block for recording the information is stored in the buffer memory in the information recording / reproducing apparatus, and abrupt vibration from the outside at the time of recording the information. For example, when the light beam deviates from the track for recording information and the recorded information is lost by scanning the adjacent track with the light beam, the data in the buffer in the device is re-recorded in the unrecorded area. This structure has the effect of improving the reliability of recorded information. Further, even when the information to be recorded exceeds the recording capacity, it is possible to obtain the effect that the information can be recorded on a separate recording medium without being lost.

[Brief description of drawings]

FIG. 1 is a block diagram showing configurations of an information recording / reproducing apparatus and an external apparatus embodying the present invention.

FIG. 2 is a flow chart showing an information recording operation of the apparatus that carries out the first embodiment of the present invention.

FIG. 3 is a flowchart showing an information recording operation of the device according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a directory recording operation of the device according to the first exemplary embodiment of the present invention.

FIG. 5 is a flow chart showing an information recording operation of an apparatus which carries out a third embodiment of the present invention.

FIG. 6 is a flowchart showing an information recording operation of an apparatus which carries out a third embodiment of the present invention.

FIG. 7 is a buffer R in the information recording / reproducing apparatus according to the present invention.
It is a block diagram of AM.

FIG. 8 is a configuration diagram of a recording information storage area in the buffer RAM of the device that implements the first embodiment of the present invention.

FIG. 9 is a configuration diagram of a recording information storage area in a buffer RAM of a device that implements a third embodiment of the present invention.

FIG. 10 is a schematic plan view of a general optical card.

11 is a cross-sectional view taken along the line BB of the optical card shown in FIG.

FIG. 12 is a diagram showing positions of an information recording area and a directory recording area on an optical card.

FIG. 13 is a block diagram showing configurations of a conventional information recording / reproducing device and an external device.

[Explanation of symbols]

 1 Host Computer 2 Interface 3 Buffer RAM 4 Optical Card 5 Modulation / Demodulation Circuit 6 MPU (Micro Process Unit) 7 PLL 8 AT / AF Control Circuit 9 Semiconductor Laser Driving Circuit 10 Optical Head 14 Information Recording / Reproducing Device 15 Directory Storage Area 16 Recording Information Storage Area 17 EOT recording information storage area 18 EOT + 1 track recording information storage area 19 Sector number storage area 20 Sector recording information storage area 21 EOS + 1 sector recording information storage area

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 7/00 9464-5D G11B 7/00 K 9464-5D E 20/10 7736-5D 20/10 H

Claims (6)

[Claims] 1. An information recording / reproducing apparatus which is connected to an external device and records / reproduces information on / from an information recording medium according to a command from the external device, wherein the external device has at least twice the capacity of a recording unit. A memory is provided, and at the time of recording information, the recording unit block adjacent to the information recording position in parallel to the recording direction is stored in the memory together with the information to be recorded, and the information is changed by the change of the recording position due to the tracking error. When the information of the recording block adjacent to the recording position is lost,
An information recording / reproducing apparatus characterized in that information lost from the information in the memory is re-recorded on a medium. 2. The information recording / reproducing apparatus according to claim 1, wherein the information recording medium is a write-once medium. 3. The information recording / reproducing apparatus according to claim 1, wherein the information recording medium is an information recording medium having a plurality of parallel tracks on a medium surface and recording on the tracks. Characteristic information recording / reproducing apparatus. 4. The information recording / reproducing apparatus according to claim 1, wherein the re-recording of the information is performed on an alternative recording block managed by the apparatus on the information recording medium. . 5. The information recording / reproducing apparatus according to claim 1, wherein the block is a track or a sector. 6. The information recording / reproducing apparatus according to claim 1, wherein the information recording medium is an optical card.