JPH01279448A - Recording and reproducing controller for magneto-optical disk - Google Patents

Abstract

PURPOSE:To reduce the processing time by providing a flag area to which status information representing the propriety of a one-succeeding sector and status information representing the presence of a one-succeeding busy sector in case of an alternate sector to a data part of each sector. CONSTITUTION:A flag area setting means 104 is provided to a recording and reproducing controller 100. The flag area setting means 104 sets a flag area with status information representing the propriety of one-preceding sector written therein to a data part of each sector being the result of plural divisions of each track of a magneto-optic disk formed concentrically or spirally. Moreover, in case of an alternate sector, a flag area with status information representing the presence of one-succeeding busy sector written therein is set. A data processing means 106 detects the status information stored in the flag area of a sector data part of one preceding position of an object sector at its 1st rotation and starts the processing to the data part of the object sector during the same rotation based thereupon. Thus, the data processing time is reduced.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to recording and reproducing of a magneto-optical disk in which information is written or successively written in sectors on tracks of a magneto-optical disk formed concentrically or spirally. Regarding a control device.

[Prior Art] Conventionally, in a magneto-optical disk device used as an external storage device for a computer system, for example, a concentric or spiral track is divided into a plurality of sectors, and information is stored in each sector. It is configured to read or read data.

Here, each sector of the magneto-optical disk has a status flag area (
A "rSSF area" (hereinafter referred to as "rSSF area") is provided. In the case of an alternative sector, status information indicating whether the alternative sector is in use is written in the SSF area.

For example, as shown in FIG. 9(a), an SSF area 1ti, 1 is provided in the ID section 2 in front of the data section 3, or as shown in FIG. 9(b), the ID section 2 and the data The SSF area 1 is set up between the areas 3 and 3.

In addition, in Fig. 9(a)(b), 7 is the sector mark (
SM), 5 is an area where PLm is locked for reading the data section, and is hereinafter referred to as a sync area (SYNC). Further, 6 is an address mark (AM).

In a magneto-optical disk, when a sector is defective, the replacement destination address information is written in the data section, thereby providing the replacement destination address information to the drive during subsequent subsequent writing.

In a magneto-optical disk, data cannot be written unless it is determined whether the sector is good or bad. In such a magneto-optical disk, status information indicating the quality of the target sector (in the case of an alternative sector, whether or not the sector is in use) is stored in the SS between the ID section 2 and the ID section 2, which is located before the data section 3.
By making it exist in F area 1, the head can
The status information can be known on the disk drive side before reaching the status information, and the processing time for writing to the data portion of the target sector can be shortened.

In other words, the existence of the SSF area 1 before the data section 3 means that before the head reaches the data section 3 during writing, the disk drive determines whether the target sector is good or bad based on the status information and writes the data section. Therefore, if the target sector is in good condition, the status information can be detected and the data section can be erased in the first rotation, and the data section can be erased in the second rotation. Writing, writing check on 3rd rotation, total disc 3
The process can be completed by rotation. This allows SSF
Compared to disk 1 if the area does not exist before the data section
Processing can be done with less rotation.

Furthermore, even if a sector defect occurs during write check after writing and alternative processing must be performed, S
If SF area 1 exists before data section 3, SSF
If an unused alternative sector is found by reading out area 1, writing can be performed immediately into the data portion of the unused sector, and alternative processing can be performed in a shorter time.

Here, the SS writes the status information shown in FIG. 9(b).
A signal writing type WJ device disclosed in Japanese Patent Application Laid-Open No. 61-229246 is known in which an F area 1 is provided between an ID section 2 and a data section 3.

In this signal write control device, it is noted that when writing a signal to an unused sector (virgin sector), there is no need to erase the data section if the write sector is unused. , the status information indicating whether or not the sector is unused is stored in the SSF area (I) of the sector several sectors before the target sector.
D section and data section), and when writing data, the past used and unused state of the target sector to be written is determined from the status information of several sectors before the target sector.
The external magnetic field is switched based on this determination result before the head reaches the data portion of the target sector.

That is, the status information of the target sector is written in the SFF area of the sector that exists several sectors before each sector, and the head moves to the target sector based on the status information obtained several sectors before the target sector. If the target sector is unused, the external magnetic field is switched to write mode, and if the sector is in use, the external magnetic field is switched to write mode, and when the head reaches the target sector, the data section of the target sector is immediately erased. can be erased or written.

If an SSF area in which status information is written is provided in a sector several sectors before such a target sector,
Writing data to a sector that is in use (has already been written) requires three disk processing times: erasing the data section of the target sector, writing data, and checking the write. The processing time required for writing and writing check is two rotations of the disk, and the processing time can be shortened.

[Problems to be Solved by the Invention] However, when such a conventional SSF area for storing status information is provided between the ID section of each sector or between the ID section and the data section, the following problem occurs.

First, if an SSF area is provided in the ID section, the ID section cannot be rewritten in a preformatted disk, so it cannot be applied to a preformatted magneto-optical disk.

Also, if the SSF area is provided between the ID section and the data section, it can be used with preformatted disks, but
In order to read the SSF area, it is necessary to newly provide a sync area (SYNC) and address mark (AM) for the SS area as well as for the data section, which leads to a decrease in the data effectiveness rate of each sector. There was a point.

In order to solve this problem, it is conceivable to provide an SSF area in which own status information is written in the data portion of the sector.

However, the SS that writes its own status information in the data section
If an F area is provided, it is possible to use a preformatted disk, but when writing data, it is necessary to first read the SSF area of the data section of the target sector in the first rotation to know the status information. be. Therefore, at the time of writing, a processing time equivalent to four rotations of the disk is required for detecting status information, erasing data, writing data, and checking for writing, resulting in a problem that the processing time becomes longer.

The present invention was made in response to these conventional problems, and it is possible to handle preformatted disks without increasing processing time, and to prevent the data validity rate from decreasing. An object of the present invention is to provide a recording/reproducing control device for a magneto-optical disk.

[Means for Solving the Problems] In order to achieve this object, in the present invention, tracks of an optical LA disc formed concentrically or spirally are divided into a plurality of sectors, and information is written in each sector. Or, in the device that performs reading, status information indicating whether the next sector is good or bad is stored in the data section of the user sector, and status information indicating whether or not the next sector is in use in the case of an alternative sector. A flag area (hereinafter referred to as "rSSF area") is set in which the ``rSSF area'' is written.

Also, the flag area set in the data part of each sector has 1
In addition to the status information of Tsutoshi's sector, its own status information is also written.

Further, the flag area is provided in a surplus portion generated as a dummy byte in the sector data portion.

[Function] In the magneto-optical disk recording/reproducing control device of the present invention having such a configuration, an SSF is provided at the beginning of the data portion of each sector as a flag area in which status information of the next sector is written. Since an area is provided, S is added to the ID section.
When providing an SF area, the S
The SF area can be changed and can also be used with pre-formatted discs.

Furthermore, in the present invention, the sink area (SYNC) and address mark (AM) necessary for reading the SSF area formed in the data area are also used for reading the data area, and the SSF area is used as a dummy area for the data area. Part-Time Job(
Since the data section is usually constructed by interleaving user data and subjecting it to error correction, these processes generate dummy bytes in the data section. )
Take advantage of. Therefore, the sector effectiveness rate does not decrease.

Furthermore, in the present invention, since the status information of every sector exists in the SSF area of the previous sector, the status information of the target sector is detected by the status information during the first rotation of the disk, and the data section of the target sector is detected. It is also possible to perform processing on This has the effect of preventing an increase in processing time for data writing.

For example, when writing a normal sector, in the first rotation, the status information of the sector flag area one position before the target sector is read, the data part of the target sector is erased based on the status information, and the flag of the erased target sector is read. The status information of the next sector to be stored in the area is read from the next sector, the status information and data secured during erasing in the second rotation are written to the data section, and the writing check of the data section is further performed in the third rotation. This can be done in the same way as the conventional ID section or the case where an SSF area is provided between the ID section and the data section, and the processing time is equivalent to three rotations of the disk.

[Embodiment 1] FIG. 1 is a functional block diagram of the present invention. The recording and reproducing control device 100 includes a recording and reproducing control IT table device 00 and a recording and reproducing section 102 that performs recording and reproducing on a magneto-optical disk.
A flag area setting means 104 is provided. The flag area setting means 104 divides each track of a magneto-optical disk formed in a concentric circle or a spiral shape into a plurality of sectors, and writes status information indicating the quality of the own sector and status information indicating the quality of the next sector into the data portion of each sector. It has a function of setting an SSF area as a flag area into which the status information shown is sent. Incidentally, in the case of an alternative sector, an SSF area is set in which status information indicating whether or not the sector itself and the next sector is in use is set.

The recording and reproducing control device 100 also includes a data processing means 10.
6 is provided, and the data processing means 106 is the data writing section 1
08, a data erase section 110, a data read section 112, and a write check section 114. Data processing means 106
During writing, the data erasing section 110 erases data, the data writing section 108 writes data, and the writing check section 114 checks the written data every time the disk rotates once in the data section of the target sector. Detection of the status information written in the SSF area of the sector data portion is performed sequentially based on the reproduced output from the data reading section 112. Furthermore, when a sector is determined to be defective from the status information during the first data erase when writing to the target sector, an alternative address written in the data area of the target sector is detected and the head is moved to the alternative sector. Then, data writing is performed.

Further, a write/read control section 120 provided in the recording/reproduction control device 100 performs overall control processing of the data processing means 106 in response to the transfer control or read control from the host computer.

FIG. 2 is a block diagram showing a first embodiment of a magneto-optical disk recording/reproducing control apparatus according to the present invention.

In FIG. 2, 20 is a CPtJ for performing write control, read control, and alternative control, 21 is a seek control circuit, 22 is an external magnetic field control circuit, and 23 is a laser control circuit. Further, 24 is a magneto-optical disk recording/reproducing device, 25
26 is a decoder, 26 is an error correction circuit, 27 is an ID section output circuit 28 is a data section detection circuit, and 29 is a data section control circuit for controlling data between the host computer and the CPU 20.

FIG. 3 is an explanatory diagram showing the sector format in the first embodiment shown in FIG. 2, and two consecutive sectors are extracted and shown.

In FIG. 3, each sector is provided with an ID section 2 following a sector mark (SM) 7, a sync area (SYNC) 5 following the ID section 2, and a data section 3 via an address mark (AM>6). In the present invention, 5SFf1t*4 is provided as a flag area in the data section 3.This SSF area 4 contains status information indicating the quality of the own sector and the quality of the next sector. In the alternative sector, status information indicating whether or not the self and the next sector is in use is written.Here, the data section 3 is usually Since it is constructed by interleaving data and applying error correction, dummy bytes are generated by this processing, and in the present invention, for example, the dummy bytes generated at the beginning of the data section are set as the SSF area. Even if a new SSF area is provided in 3, the sector effectiveness rate will not decrease because the dummy byte is used as the SSF area.

Next, the data write operation in the embodiment shown in FIG. 2 will be explained with reference to the flowchart shown in FIG.

First, write access from the host computer to C
When the PU 20 receives this, the CPU 20 instructs the external magnetic field control circuit 22 to set the external magnetic field to the erase mode in order to write data to an arbitrary target sector (step Sl). Next, the CPU 20 issues a command to the seek control circuit 21 to move the recording/reproducing head to one sector before the target sector for writing, and adjusts the laser power to the laser control circuit 23 in order to read as soon as the movement is completed. The ID detection circuit 27 detects the start of the ID signal 40, the decoder 25 decodes the ID signal 40, and the CPU 20 reads the combined signal from the decoder 25. This reading of the ID section by the CPU 20 continues until the ID section of the sector immediately before the target sector for writing appears. If the ID of the sector immediately before the target sector is obtained by reading this ID section, the CPU 20 starts reading the data section signal 44 of this sector. That is, first, the data section detection circuit 28 detects the beginning of the data section, and
Subsequently, after error correction of the data section is performed by the decoder 25 and the error correction circuit 26, only the status information regarding the next target sector read from the SSF area of the data section by the data section publishing control circuit 29 is sent to the CPLI 20. Output.

Through these series of operations, the CPU 20 can learn information regarding whether the target sector to which data will be written is good or bad. The above is the process shown in steps 82 to S6 in FIG. 4.

Thereafter, if the target sector is a normal sector based on the status information read from the data part immediately before the target sector, the CPU controls the laser by the laser control circuit 23 to erase the data part of the target sector.

Here, if the data portion of the target sector is erased, the SSF area included in the data portion will also be erased.

Therefore, when writing the data part of the next target sector, the status information of the sector after the target sector is written to the SSF.
In order to write to the area, the CPU 20 needs to secure the status information of the sector immediately after the target sector. Therefore, after the data section of the target sector has been erased, the laser control circuit 23 is controlled to read out the SSF area in the data section of the next sector following the target sector, and the data written in the 33FFI area of the erased target sector is read out. The status information of the next sector is taken into the CPU 20. The above target sector erasing process corresponds to steps 87 to S13 in FIG. 4.

Subsequently, the CPtJ 20 controls the laser by the laser control circuit 23 and instructs the external magnetic field circuit 22 to switch to the light mode, thereby continuing to trace the same track in the second rotation and receiving the ID signal 40 of the target sector. After detection, the data commanded by the host and the status information of the sector immediately after the target sector secured by the erase process are written in the data portion of the target sector. Writing this data and status information to the data portion of the target sector becomes the processing of steps 314 to 318 in FIG.

Subsequently, in the third rotation, the laser control circuit 23 is
By performing JI, the data signal 44 of the data portion of the target sector written in the second rotation is read and a write check is performed. When it is confirmed that normal recording is performed by this check of the target sector, the series of processing is terminated. On the other hand, if it is detected in the write check that normal recording is not being performed, the alternative process shown in FIG. 5 will be performed. This write check is step 8 in Figure 4.
The processing is from 19 to S21.

On the other hand, if the next target sector is a defective sector, the data part of the target sector is read based on the status information of the SSF area of the data part of the sector immediately before the target sector in the first rotation, and the data part control circuit 29 reads the data part of the target sector. outputs the address information of the alternative destination included in the data section to the CPU 20,
Based on this alternative address information, the CPU 20 issues a seek command to the seek control circuit 21 to the alternative address. This series of processing corresponds to steps 322 to 326 in FIG. 4. The processing after the CPU 20 issues a seek command to the replacement destination address is the same as when the target sector is a normal sector, and the processing of the data part in the first rotation of the target sector shown in steps 87 to S20 in FIG. Erasing, data writing in the second rotation, and write checking in the third rotation are performed. If it is determined to be a bad sector in the inclusion check shown in steps 819 to S20 in FIG. 4, the alternative process shown in FIG. 5 is executed.

That is, the CPU 20 instructs the seek control circuit 21 to seek to a predetermined alternative sector area. This seek command to the alternative sector area sequentially reads the status information of the SSF area provided in the data section of the alternative sectors formed in the alternative sector area, and checks whether the alternative sector located one position later is unused. and searches for an unused alternative sector.

If the status information indicates unused, the alternative sector located one sector after this sector is unused, so a write check is performed on the data section of the unused alternative sector, and the target sector is determined to be defective. The data that should have been written to the CPU is read out along with its status information, and the read-in check is performed in the second rotation. (Alternative sectors are normally used in order from the beginning of the alternative sector area, so the alternative sector after the alternative sector is always unused. Therefore, when writing during alternative processing, the alternative sector after the next (There is no need to read out the status information of the sector.) If the write check determines that the sector is normal, the target sector that was determined to be a bad sector is returned to, and the replacement destination 7 is stored in its data section.
Write the dress along with status information. On the other hand, if normal writing cannot be performed in the alternative sector, the status information regarding the alternative sector is replaced with "defective", and then a search is performed for a new alternative sector that can be replaced. Of course, at the end of the alternative process, status information indicating that the target sector (user sector) is defective and is in use is stored in the SSF area of the target sector (user sector) that has become defective and the sector immediately before the alternative sector that has become in use due to a series of alternative processes. Write.

FIG. 6 shows the operational flow of the read process in accordance with the embodiment shown in FIG. Move the recording/reproducing head to find the ID of the target sector. When the ID of the target sector appears, the reading operation of the data part signal 44 of this sector is started, and after decoding and error correction, only the status information of the target sector is outputted by the data part control circuit 29 to the CPtJ 20. CP that received the status information of this target sector
If the U20 determines that the target sector is a bad sector based on the status information, it recognizes the data in the data section following the ID section as address information of the replacement destination, outputs this replacement destination address information to the CPtJ20, and the CPU 20 determines the replacement destination. A seek command to the address is issued, and data read from the data portion of the alternative sector specified by the alternative address is transferred to the host. Of course, if the target sector is found to be a normal sector, the data in the data section will be transferred to the host.

FIG. 7 shows ss in the data section used in the second embodiment of the present invention.
It is an explanatory diagram of the sector format that formed the Fm area,
This embodiment is characterized in that an error correction area 8 is provided in a part of the SSF area.

That is, by providing the error correction area 8 in a part of the SSF area, error correction can be performed only in the flag area.

Specifically, if a part of the SSF area is not allocated to the error correction area 8, - Continuation of the data section - Error correction in the entire data section - Extraction of the flag area (SSF area) - Contents (status information) The status information cannot be known until some errors in the entire data section are completed.

Therefore, when strong error correction is applied, the status information of the target sector may not be known before the head reaches the data portion of the target sector.

On the other hand, as shown in FIG. 7, when a part of the SSF area is allocated to the error correction area 8, reading of the data area, extraction of the flag area, error correction only in the flag area, and contents (status information) are possible. ) becomes recognized. Correcting errors only in the flag area requires a shorter correction processing time than correcting errors in the entire data area, so according to this method, before the head reaches the data area of the target sector, the data from the flag area is This has the advantage of being able to reliably know the status information.

The device configuration according to the sector format shown in Figure 7 is
The result will be as shown in the figure.

That is, in FIG. 8, in addition to the device configuration of the first embodiment shown in FIG. Just add it to . As a result, the status information can be read immediately after error correction is performed in the SSF area only without waiting for the correction of data section 3 to be completed, and even when strong error correction is performed, the head can read the next sector. Before reaching the data section, ensure that the status information of itself and the status information of the next sector are C
You can find out from PU20.

[Effects of the Invention] As described above, according to the present invention, an SSF area as a flag area in which status information is written is provided at the beginning of the data section of each sector, and own status information and one In order to write the status information of the later sector, it is compatible with both pre-format and soft-format discs, and for both types of discs, data can be written in 3 disc revolutions, and data can be played back in 1 disc. It can be finished by rotating.

In addition, the SSF area is provided in the surplus part (dummy byte) at the beginning of the data section, and the sink area and address mark for reading the SSF area are also used for the data section, so even if the ssFm area is provided in the data section, the sector Effectiveness rate does not decrease.

Furthermore, if an ECC area is provided in the SSF area, status information can be read without waiting for error correction in the data area. For example, if the head is inserted into the data area of the next sector before error correction of the previous sector is completed Even with regard to magneto-optical disk devices in which errors occur, that is, it takes more than one sector to correct an error in the data section, data loading/unloading can be completed in three disk rotations and reproduction can be completed in one disk rotation. This makes it possible to shorten the access time for loading and reading.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of the present invention; FIG. 2 is a block diagram showing the first embodiment of the present invention;
The figure is an explanatory diagram of the sector format used in the first embodiment of the present invention: Figure 4 is a flow chart showing the write process of the present invention; Figure 5 is a flow chart showing alternative processing of the present invention; Figure 6 is a flow chart showing the alternative process of the present invention; A flowchart showing the successive processing of the present invention; FIG. 7 is an explanatory diagram of the sector format used in the second embodiment of the present invention; FIG. 8 is a block diagram showing the second embodiment of the present invention;
The figure is an explanatory diagram of a sector format according to the prior art. 20: CPU 21: Seek control circuit 22: External magnetic field control circuit 23: Laser control circuit 24: Recording/reproducing device 25: Decoder 26: Error correction circuit 27: ID section output circuit 8: Data section detection circuit 29: Data Part control circuit 30: SSF area reading circuit 31: Error correction circuit 100: Recording and reproducing control device 102: Recording and reproducing section 104: Flag area setting means 106: Data processing means 108: Data writing section 110: Data erasing section 112: Data Reading section 114: Writing check section 116: Writing/reading control section

Claims (3)

[Claims] (1) In a device that divides each track of a magneto-optical disk formed in a concentric or spiral shape into a plurality of sectors and writes or reads information in sector units, one a flag area setting means for setting a flag area in which status information indicating the quality of the succeeding sector is written, and status information indicating whether the succeeding sector is in use in the case of an alternative sector; recording of the magneto-optical disk; At the first rotation during playback,
A data processing means for detecting status information stored in a flag area of a sector data section immediately before the target sector and starting processing for the data section of the target sector during the same rotation based on the status information. A recording/playback control device for a magneto-optical disk. (2) The magneto-optical device according to claim 1, wherein the flag area setting means writes the status information of the next succeeding sector and the own status information in the flag area set in the data section of each sector. Disk signal writing control device. (3) The format control method for a magneto-optical disk according to claim 1, wherein the flag area setting means sets the flag area in a dummy byte of a sector data portion.