JP2002015505A - Disk drive and data reproducing method in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wrong reproduced data from being transferred to a host device, when a reproducing head such as an optical pickup moves to an adjacent track due to vibrations, impact, etc. SOLUTION: Sector address information is read from the header of a reproduction sector and stored in a register (ST2 and ST4). Data (including parity for error correction) are read from the data part of the reproduction sector and are subjected to demodulation processing and error correction processing, and the data that have been subjected to error correction are stored in a buffer (ST5 to ST9). The sector address information of subsequent sectors is read and stored in the register (ST10 to ST12). Whether there is continuity between the sector address information of the reproduction sector and that of the subsequent sectors is decided (ST13), and only when there is continuity, are the data of the reproduction sector existing in the buffer made transferable to the host device (host) (ST14). Thus, wrong data can be prevented from being transferred to the host device, when a reproducing head, such as the optical pickup, moves to an adjacent track due to vibrations, impact, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for handling a disk-shaped recording medium such as a magneto-optical disk, and a data reproducing method in the disk drive. Specifically, only when there is continuity between the reproduced sector address information of the predetermined sector and the sector address information of the succeeding sector reproduced subsequently, the reproduction data from the data recording area of the predetermined sector is transferred to a host device such as a host computer. When a reproducing head such as an optical pickup moves to an adjacent track due to vibration or shock,
The present invention relates to a disk drive or the like that attempts to prevent erroneous reproduction data from being transferred to a host device.

[0002]

2. Description of the Related Art FIG. 6 shows a sector format of a 5.2 Gbyte double-sided magneto-optical disk (ISO / IEC 15286). The numbers given in the figure represent the number of bytes.

One sector includes a header, a transition area TA1, an ALPC gap,
It is divided into VFO3, sync field, data field, postamble PA2, buffer field, and transition area TA2.

[0004] This sector is roughly divided into an address section (header) and a data section. ALPC gaps and transition areas TA1 and TA are provided before and after the data section.
A2 is arranged. The header is a read-only area in which so-called emboss pits are preformatted and recorded, and is other than the header, that is, the transition area TA1.
The section from to the transition area TA2 is an MO (magneto-optical) area.

A 64-byte header as an address portion includes a sector mark SM (8 bytes), a VFO field VFO1 (26 bytes), and an address mark AM1 (1 byte).
Byte), ID field ID1 (5 bytes), VF
The configuration is such that VFO2 (16 bytes) of the O field, address mark AM2 (1 byte), ID2 (5 bytes) of the ID field, and postamble PA1 (2 bytes) are arranged in order.

[0006] The sector mark SM is a mark for identifying the start of a sector, and a pattern not generated in the (1-7) RLL code or the (2-7) RLL code is formed by embossing.

The VFO field is the P of the disk drive.
VFO (Variable Fr) in LL (Phase-Locked Loop) section
equency Oscillator).
That is, the VFO field is a PLL pull-in area. The VFO field in one sector is VFO
1, VFO2 and VFO3, and VFO1 and VFO2 are formed in the address portion by embossing. The VFO 3 is provided in the data section, and is recorded magneto-optically when a recording operation is performed on the sector.

In VFO1 and VFO2, a signal of a predetermined pattern for performing PLL pull-in (generation of a read clock) for reading data in the header is recorded. On the other hand, in VFO3, a signal of data in the data portion is recorded. A signal of a predetermined pattern for performing PLL pull-in (generation of a read clock) for reading is recorded.

The address marks AM1 and AM2 are used to obtain byte synchronization for a subsequent ID field, and have a predetermined pattern. Address marks AM1 and AM2 are formed in the address portion by embossing. The ID field has sector address information, that is, information of a track number and a sector number (3 bytes).
And CRC bytes (2 bytes) for error detection for these pieces of information are arranged in order. The same data is recorded in each of the 5-byte ID fields ID1 and ID2. In the address portion, ID1 and ID2 are formed by embossing.

Following the header, the transition area TA1
The ALPC gap is provided for securing the time required for the disk drive to complete the process of reading the header, for allowing the displacement of the VFO 3 later, for testing the laser power at the time of recording, and the like. Have been.

The data section is composed of a VFO 3, a sync field, a data field, a postamble PA2, and a buffer field. Think field (4
Byte) is used to obtain byte synchronization for the subsequent data field and has a predetermined bit pattern.

The data field is provided for recording user data. 2048 as user data
Bytes are reserved, and in addition, parity and the like for error detection and error correction are recorded, so that the data field has 2498 bytes. The buffer field is a margin for rotation jitter. FIG.
Shows the data configuration of the magneto-optical disk of 2048 bytes / sector.

"SB1" to "SB4" are sync bytes (Sy
nc byte), which is a synchronization signal recorded in the above-mentioned sync field. “RS1” to “RS59” are resync bytes, and are allocated every 40 bytes, that is, every two interleaves. "D1"-"D2048"
Is a user byte, which is 2 in the column direction.
It has a length of 0 bytes and is sequentially arranged in the Row direction. "SWF
1 ”and“ SWF2 ”are SWF (Sector Written Fla
g) bytes. “C1” to “C4” are CRC bytes. “E1,1” to “E20,16” are parity for error correction. The parity generation direction is the Row direction.

A disk drive for handling a magneto-optical disk having the above-described sector format is used by being connected to a host computer, for example, as a host device. Usually, when data is read from a disk and transferred to the host computer, the disk drive performs the following processing. That is, the sector address information on the disk is read, and if it matches that of the target sector, the data is read from the disk, demodulated and error corrected, and then temporarily stored in the buffer memory. When the interface with the host computer is ready, the data is read from the buffer memory and transferred to the host computer. If the error cannot be completely corrected by the error correction processing, the data readout is retried, and if the error-corrected complete data cannot be obtained even after a predetermined number of retries, the data is sent to the host computer. Notify the error instead of forwarding

[0015]

As described above, in the conventional disk drive, when there is an error in the data read from the disk and the data cannot be corrected, the error is notified to, for example, a host computer as a host device, It does not transfer erroneous data.

Here, a case is considered where the target sector is sector A and the optical pickup scans with a scanning locus such as sector A → sector (A + 1) →... As indicated by R1 in FIG. . In this case, as shown in FIG. 9A, the data (DA
TA) and parity (ECC) for error correction are reproduced. After that, an error correction process is performed to
Is obtained, and the data in the sector A is transferred to the host computer via the buffer memory.

On the other hand, the target sector is sector A, and as shown by R2 in FIG. 8, the optical pickup moves from sector A to sector B to sector (+
Suppose a case where scanning is performed with a scanning locus as shown in 1). In this case, as shown in FIG. 9B, a part of the data is reproduced from the data field of the sector A, and then a part of the data and the parity for error correction are reproduced from the data field of the sector B. Is performed.

Here, when the data of the sector A and the data of the sector B are substantially the same, for example, when the data other than the first 10 bytes is completely the same, the reproduced data is error-corrected by the parity for error correction of the sector B. In some cases, the data is corrected and the data in sector B is obtained. In this case, the data of the sector B is transferred to the host computer as data of the sector A via the buffer memory. Therefore, in this case, the data in the wrong sector is transferred to the host computer.

When the tracking servo deviation is detected, if the reproduction data is not transferred to the host computer, the data of the wrong sector is not transferred to the host computer as described above.
However, due to recent track narrowing, the amplitude of the tracking error signal itself cannot be obtained, and as a result, the error detection margin tends to be reduced.

Therefore, according to the present invention, there is provided a disk drive or the like which can prevent erroneous reproduction data from being transferred to a host device when a reproduction head such as an optical pickup moves to an adjacent track due to vibration or shock. The purpose is to provide.

[0021]

According to the present invention, a sector as a recording unit is formed by a header area in which preformat data including sector address information is recorded, and a data recording area following the header area. A disk drive for handling a disk-shaped recording medium, comprising: data reproducing means for reproducing preformat data from a sector header area and reproducing data from a sector data recording area; and data reproduced from a sector data recording area. Buffer means for temporarily storing data, storage means for storing sector address information extracted from the preformat data reproduced from the header area of the sector, and data stored in the storage means. The sector address information of the specified sector and the Judging means for judging the continuity with the sector address information of the succeeding sector; and when the judging means judges that there is continuity, the data reproduced from the data recording area of the predetermined sector stored in the buffer means. And control means for permitting transfer to a higher-level device.

The present invention also provides a disk-shaped recording medium in which a sector as a recording unit is formed by a header area in which preformat data including sector address information is recorded, and a data recording area following the header area. Reproducing a preformat data from a header area of a sector and reproducing data from a data recording area of the sector, and buffering the data reproduced from the data recording area of the sector. Means for storing the sector address information extracted from the preformat data reproduced from the header area of the sector in the storage means. The sector address information of the sector and the Judging the continuity with the sector address information of the succeeding sector to be reproduced, and, when the continuity is judged by the continuity judgment, reproducing the data from the data recording area of the predetermined sector stored in the buffer means. Permitting the transferred data to be transferred to a higher-level device.

In the present invention, preformat data is reproduced from the header area of the sector, and data is reproduced from the data recording area of the sector. Then, the data reproduced from the data recording area is temporarily stored in the buffer means. The sector address information included in the preformat data reproduced from the header area is extracted and stored in the storage unit. In the storage means,
For example, the sector address information of a predetermined sector from which data is reproduced and the sector address information of a succeeding sector reproduced after the predetermined sector are stored. When data is reproduced continuously from a plurality of sectors, the stored contents are Is updated from time to time.

The continuity between the sector address information of a predetermined sector from which data has been reproduced and the sector address information of a succeeding sector following the data is determined with reference to the storage contents of the storage means. For example, when the scanning track is moved due to vibration or impact while a reproducing head such as an optical pickup scans a succeeding sector from a predetermined sector, the sector address information of the predetermined sector and the sector address information of the succeeding sector following this are read. Continuity is lost.

When it is determined that there is continuity, the data of the predetermined sector stored in the buffer means is transferred to the host device,
For example, transfer to the host computer is permitted. This prevents transfer of erroneous reproduction data to a higher-level device when a reproduction head such as an optical pickup moves to an adjacent track due to vibration or impact.

When it is determined that there is no continuity, for example, the reproduction of data from the data recording area of a predetermined sector is repeated. Then, for example, when the number of repetitions reaches a preset number, an error is notified to the higher-level device, and the reproducing operation is terminated. As described above, the use of the determination result of the continuity of the sector address information may be arbitrarily selected. This selection is performed, for example, by control from a higher-level device.

The present invention also provides a disk-shaped recording medium in which a sector as a recording unit is formed by a header area in which preformat data including sector address information is recorded, and a data recording area following the header area. A disk drive that handles preformatted data from a sector header area,
Data reproducing means for reproducing data from the data recording area of the sector; buffer means for temporarily storing data reproduced from the data recording area of the sector by the data reproducing means; Determining means for determining whether or not the sector address information of the sector has been correctly reproduced; and, when the determining means determines that the sector address information of the succeeding sector cannot be correctly reproduced, the data of the predetermined sector stored in the buffer means. And control means for controlling not to transfer data reproduced from the recording area to the host device.

Further, the present invention provides a disk-shaped recording medium in which a sector as a recording unit is formed by a header area in which preformat data including sector address information is recorded, and a data recording area following the header area. Reproducing a preformat data from a header area of a sector and reproducing data from a data recording area of the sector, and buffering the data reproduced from the data recording area of the sector. Storing the data reproduced from the data recording area of the predetermined sector stored in the buffer means to the host device when the sector address information of the succeeding sector following the predetermined sector from which the data has been reproduced cannot be correctly reproduced. And the step of controlling not to transfer. It is obtain things.

In the present invention, preformat data is reproduced from the header area of the sector, and data is reproduced from the data recording area of the sector. Then, the data reproduced from the data recording area is temporarily stored in the buffer means.

Then, it is determined whether or not the sector address information of the succeeding sector following the predetermined sector from which the data has been reproduced has been correctly reproduced. When it is determined that the sector address information of the succeeding sector cannot be correctly reproduced, the transfer of the data of the predetermined sector stored in the buffer means to the host device, for example, the host computer is suspended. As described above, when the sector address information of the succeeding sector cannot be correctly reproduced, the continuity of the sector address information cannot be determined using the sector address information of the succeeding sector. This prevents transfer of erroneous reproduction data to a higher-level device when a reproduction head such as an optical pickup moves to an adjacent track due to vibration or impact.

When it is determined that the sector address information of the succeeding sector cannot be correctly reproduced, for example, the reproduction of data from the data recording area of a predetermined sector is repeated. Then, for example, when the number of repetitions reaches a preset number, an error is notified to the higher-level device, and the reproducing operation is terminated. As described above, the use of the determination result as to whether or not the sector address information of the succeeding sector has been correctly reproduced may be arbitrarily selected. This selection is performed, for example, by control from a higher-level device.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of the magneto-optical disk drive 100.

The magneto-optical disk 111 handled by the drive 100 has a spirally formed groove on the data recording surface, not shown, and information is recorded using both the groove and the land between the grooves as tracks. Recording and reproduction are performed.

FIG. 2 shows a layout of the magneto-optical disk 111. The magneto-optical disk 111 is zoned, and zones 0 to 0 extend from the outer circumference to the inner circumference.
A recording area of 16 zones up to zone 15 is provided.
Each zone includes a plurality of sectors in the circumferential direction. For example, zone 0 contains 30 sectors,
The zone 15 includes 15 sectors. Each sector has, for example, a format as shown in FIG. The data recorded in the data field has, for example, a configuration as shown in FIG.

FIG. 3 shows detailed information of each zone. Here, the magneto-optical disk 111 rotates at 3000 rpm and makes one rotation at 20 ms. The ID length in FIG. 3 indicates the time length of the header of each sector.
The D interval indicates a time interval between the header of a certain sector and the header of the next sector. FIG. 4 shows the comparison between the ID length and the ID interval in zone 0 and zone 15.

Returning to FIG. 1, the drive 100
A spindle motor 113 for rotating and driving the above-described magneto-optical disk 111 is provided. Magneto-optical disk 1
Reference numeral 11 is rotated at 3000 rpm during recording and reproduction. A frequency generator 114 for detecting a rotation speed of the spindle motor 113 is attached to a rotation shaft of the spindle motor 113.

The drive 100 includes a bias magnet (BM) 115, an optical pickup 117 composed of a semiconductor laser, an objective lens, a photodetector, and the like, and a laser driver for controlling light emission of the semiconductor laser of the optical pickup 117. 118. The bias magnet 115 and the optical pickup 117 are mounted on the magneto-optical disk 1.
11 are disposed so as to face each other.

The laser driver 118 is supplied with a laser power control signal SPC from a servo controller 141 which will be described later, and the power of the laser beam output from the semiconductor laser of the optical pickup 117 becomes the recording power P during recording.
W, and at the time of reproduction, the reproduction power PR is controlled to be lower than the recording power PW. The operation of generating an external magnetic field from the bias magnet 115 is also controlled by the servo controller 141.

At the time of writing data (at the time of recording), an NRZI (non-return) is supplied to the laser driver 118 as described later.
rn to Zero Inverted) Recorded data Dr as data
Is supplied, the laser beam output from the semiconductor laser is modulated by the recording data Dr, and the recording data Dr is recorded on the magneto-optical disk 111 in cooperation with the external magnetic field from the bias magnet 115.

The drive 100 has a CPU (centra
l Servo controller 14 with processing unit
One. This servo controller 141 includes:
The focus error signal SFE and the tracking error signal STE generated by the optical pickup 117, and the frequency signal SFG output from the frequency generator 114 described above.
Is supplied.

The operation of the servo controller 141 is controlled by a system controller 151 described later.
The servo controller 141 controls the tracking coil, the focus coil, and the optical pickup 1.
An actuator 145 including a feed motor for moving the optical pickup 17 in a radial direction (radial direction) is controlled to perform servo of tracking and focus, and to control the movement of the optical pickup 117 in the radial direction. Also,
Spindle motor 1 by servo controller 141
13 is controlled so that the magneto-optical disk 111 rotates at 3000 rpm during recording or reproduction as described above.

The drive 100 includes a system controller 151 having a CPU and a data buffer 152.
A host interface for transmitting and receiving data and commands between the host and a host computer as a host device, for example, a SCSI (Small Computer System Interface).
e) 153. System controller 15
1 is for controlling the whole system.

The drive 100 adds an error correction code to write data supplied from the host computer through the interface 153, and
An ECC (error correction code) circuit 154 for performing error correction on output data of the data demodulator 160, which will be described later, and a data bit string of write data to which an error correction code has been added by the ECC circuit 154 are RLL (Ru
n Length Limited) modulated bits and then NR
A data modulator 155 that converts the data into ZI data to obtain the recording data Dr.

Here, for example, (1,7) RLL modulation is used as RLL modulation. This (1,7) R
In the LL modulation, 2-bit data is converted into 3 channel bits, thereby limiting the number of 0s between 1 and 1 of the channel bits to 1 to 7. The NRZI data is obtained by associating 1 of channel bits with polarity inversion and 0 with channel non-inversion. In this case, the polarity inversion interval is between 2 channel bits and 8 channel bits.

The drive 100 performs waveform equalization processing, binarization processing, data detection processing, and the like on the reproduction signal SMO and the sum signal SRF obtained from the optical pickup 117, and performs a header (address section) A read processing circuit 156 that obtains the reproduction data Dp of the data portion, and a data demodulator 160 that performs demodulation processing and the like on the reproduction data Dp to obtain sector address information (information of track numbers and sector numbers) and read data. Have. The sector address information obtained by the data demodulator 160 is supplied to the system controller 151 and used for managing the recording position and the reproduction position.

The drive 100 has a register 17 as storage means for storing sector address information.
1,172. These registers 171, 17
Numeral 2 is for storing sector address information reproduced from the header when data is read (reproduced).
The register 172 stores sector address information of a predetermined sector (N sector) from which data has been reproduced, and the register 171 stores sector address information of a succeeding sector (N + 1) sector reproduced after the predetermined sector. Is done. When data is continuously read from a plurality of sectors, the storage contents of the registers 171 and 172 are updated as needed.

Next, the operation of the magneto-optical disk drive 100 shown in FIG. 1 will be described. When a data write command is supplied from the host computer to the system controller 151, data writing (recording) is performed.
In this case, the ECC circuit 154 adds an error correction code to the write data received from the host computer and stored in the data buffer 152 by the interface 153,
Conversion to LL modulation bits and conversion to NRZI data are performed.

The laser driver 1 from the data modulator 155
The recording data Dr as NRZI data is supplied to 18, and the recording data Dr is recorded in a data field as a target position on the magneto-optical disk 111. In this case, a high-power laser beam is applied from the optical pickup 117 to the magneto-optical disk 111 so that the recording film of the magneto-optical disk 111 reaches the Curie temperature.

When a data read command is supplied from the host computer to the system controller 151, data is read (reproduced) from the target position on the magneto-optical disk 111. In this case, the optical pickup 117 obtains the reproduction signal SMO from the data field of the sector as the target position of the magneto-optical disk 111. The read signal SMO is subjected to waveform equalization processing, binarization processing, data detection processing, and the like by the read processing circuit 156 to obtain reproduction data Dp.

The reproduced data Dp is subjected to demodulation processing by the data demodulator 160, and furthermore to the ECC circuit 154.
And error correction is performed to obtain read data. This read data is temporarily stored in the data buffer 152, and thereafter transmitted to the host computer via the interface 153 at a predetermined timing.

Next, using the flowchart of FIG.
The processing at the time of data reading in the system controller 151 will be described. This processing is performed after the seek to the target track position is completed.

First, in step ST1, the reproduction data Dp
It is determined whether or not a sector mark has been detected. This sector mark is a mark for identifying the start of a sector, as described above. When a sector mark is detected, the process proceeds to step ST2. In this step ST2,
An address mark is detected from the reproduced data Dp, and sector address information (track number and sector number information) is read from the ID field based on the address mark. Although not shown in FIG. 1, the data demodulator 160 also includes a sector mark detector, an address mark detector, and the like.

Next, in step ST3, it is determined from the read sector address information whether the sector is a target sector. If it is not the target sector, step S
Returning to T1, the process is repeated from the detection of the sector mark. If it is determined in step ST3 that the sector is the target sector, in step ST4, the sector address information read in step ST2 is stored in the register 172 as the sector address information of the reproduction sector.
Proceed to. In step ST5, an operation of reading data from the data section is performed. Then, in step ST6,
A demodulation process is performed, and an error correction process is performed in step ST7, and thereafter, the process proceeds to step ST8.

In step ST8, it is determined whether or not the error has been corrected. If the error has been corrected, the error-corrected data is stored in the data buffer 152 in step ST9. Then, in step ST10, the sector address information of the succeeding sector to be reproduced next is read.
Also in this case, the sector address information is read after the detection of the sector mark and the detection of the address mark.

Next, in step ST11, it is determined whether or not the sector address information of the succeeding sector has been normally read. If the data has been read normally, the sector address information of the succeeding sector is stored in the register 171 in step ST12. Next, in step ST13, it is determined whether or not there is continuity between the sector address information of the reproduction sector stored in the register 172 and the sector address information of the succeeding sector stored in the register 171. If the scanning track is moved by vibration or impact while the optical pickup 117 scans the succeeding sector from the reproducing sector (see the scanning locus of R2 in FIG. 8), the continuity is lost.

If it is determined in step ST13 that there is continuity, the process proceeds to step ST14. In this step ST14, the data from the reproduction sector stored in the data buffer 152 is set to be ready for transmission to the host computer via the interface 153. That is, the transfer of data to the host computer is permitted.
Thus, as soon as the interface with the host computer is ready, the data from the reproduction sector is transferred to the host computer.

Next, in step ST15, it is determined whether or not a processing sector (read sector) remains. If the processing sector remains, in step ST16, the sector address information of the succeeding sector stored in the register 171 is stored in the register 172 as the sector address information of the reproduction sector. Then, returning to step ST5, the same processing as described above is repeated. On the other hand, if no processing sector remains, the process ends.

If the data cannot be corrected in step ST8, the process proceeds to step ST17.
Then, it is determined whether or not the error correction for the data from the reproduction sector cannot be performed N times. N is a positive integer and can be set in advance. If it is not the Nth time, the process returns to step ST1, and the process is repeated from reading the sector address information of the reproduction sector at that time. On the other hand, if it is the Nth time, step ST
At 18, an error is notified to the host computer via the interface 153, and the process ends.

If the sector address information of the succeeding sector could not be read normally in step ST11, whether the sector address information of the succeeding sector could not be read normally in step ST19 is the M-th time. Determine whether or not. M is a positive integer and can be set in advance. If it is not the M-th time, the process returns to step ST1 to repeat the process from reading the sector address information of the reproduction sector at that time. On the other hand, if it is the M-th time, in step ST18, an error is notified to the host computer via the interface 153, and the process ends.

If it is determined in step ST13 that the sector address information is not continuous, the process proceeds to step ST13.
At 20, it is determined whether or not the sector address information of the reproduction sector and the subsequent sector has no continuity at the L-th time. L is a positive integer and can be set in advance. If it is not the L-th time, the process returns to step ST1 to repeat the process from reading the sector address information of the reproduction sector at that time. On the other hand, if it is the L-th time, in step ST18, an error is notified to the host computer via the interface 153, and the process ends.

As described above, in the above embodiment, when there is no continuity between the sector address information of the reproduction sector and the sector address information of the succeeding sector, the data from the reproduction sector is transferred to the host computer. Since no permission is given, it is possible to prevent transfer of erroneous reproduction data to the host computer when the optical pickup moves to an adjacent track due to vibration or impact.

In the above embodiment, when the sector address information of the succeeding sector cannot be read normally, the continuity of the sector address information cannot be determined based on the sector address information of the succeeding sector. Since the transfer of the data from the sector to the host computer is not permitted, it is possible to prevent erroneous reproduction data from being transferred to the host computer when the optical pickup moves to an adjacent track due to vibration or impact.

In the above embodiment, when there is no continuity between the sector address information of the reproduction sector and the sector address information of the succeeding sector, the transfer of data from the reproduction sector to the host computer is not permitted. However, it may be possible to arbitrarily select to use the determination result of continuity as described above. This selection can be made, for example, by control from a host computer. If the continuity determination result is not used, transfer of data from the playback sector to the host computer is permitted even if there is no continuity between the sector address information of the playback sector and the sector address information of the subsequent sector. Becomes

In the above embodiment, when the sector address information of the succeeding sector cannot be read normally, the transfer of data from the reproduction sector to the host computer is not permitted. In this manner, it may be possible to arbitrarily select to use the determination result as to whether or not the sector address information of the succeeding sector has been normally read. This selection can be made, for example, by control from a host computer.

This selection may be made by the system controller 151 itself. For example, there is a case where the sector address information of the succeeding sector cannot be read correctly due to a defect or dust on the disk. If the system controller 151 cannot read the sector address information of the succeeding sector correctly even after reading the sector address information of the succeeding sector for the preset number of retries, the reason is that a defect or dust is present on the disk. And switching is performed so as not to use the result of determination as to whether or not the sector address information of the succeeding sector has been normally read. This makes it possible to transfer data from the reproduction sector to the host computer.

In the above embodiment, the present invention is applied to the magneto-optical disk drive 100 for handling the magneto-optical disk 111. However, the present invention is also applicable to other optical disks and disk drives for handling magnetic disks. The same can be applied.

[0067]

According to the present invention, only when there is continuity between the sector address information of a predetermined sector and the sector address information of a succeeding sector to be reproduced subsequently, the reproduction data from the data recording area of the predetermined sector is read from the host. It can be transferred to a host device such as a computer, and can prevent transfer of erroneous playback data to a host device when a reproducing head such as an optical pickup moves to an adjacent track due to vibration or shock. .

According to the present invention, when the sector address information of the succeeding sector cannot be read normally, the continuity of the sector address information cannot be determined based on the sector address information of the succeeding sector. Does not permit the transfer of data from the host computer to the host computer, and prevents the transfer of erroneous reproduced data to a host device when the optical pickup moves to an adjacent track due to vibration, shock, or the like. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a magneto-optical disk drive as an embodiment.

FIG. 2 is a diagram showing a layout of a magneto-optical disk.

FIG. 3 is a diagram showing detailed information of each zone of the magneto-optical disk.

FIG. 4 shows IDs of zone 0 and zone 15 of the magneto-optical disk
It is a figure which compares and shows a length and an ID interval.

FIG. 5 is a flowchart showing a process at the time of reading data.

FIG. 6 is a diagram showing an example of a sector format of a magneto-optical disk.

FIG. 7 is a diagram showing a configuration example of data recorded in a data section.

FIG. 8 is a diagram for explaining a scanning trajectory of the optical pickup.

FIG. 9 is a diagram for explaining processing of reproduced data.

[Explanation of symbols]

100: magneto-optical disk drive, 111: magneto-optical disk, 115: bias magnet, 11
7 optical pickup, 118 laser driver, 141 servo controller, 145 actuator, 151 system controller, 1
52 ... data buffer, 153 ... host interface, 154 ... ECC circuit, 155 ... data modulator, 156 ... read processing circuit, 160 ...
.Data demodulators, 171, 172... Registers

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G11B 20/18 552 G11B 20/18 552F 572 572D 572F 574 574H

Claims (16)

[Claims] 1. A disk drive for handling a disk-shaped recording medium in which a sector as a recording unit is formed by a header area in which preformat data including sector address information is recorded, and a data recording area following the header area. Data reproducing means for reproducing the preformat data from the header area of the sector and reproducing the data from the data recording area of the sector; and temporarily reproducing the data reproduced from the data recording area of the sector. Buffer means for temporarily storing data, storage means for storing the sector address information extracted from the preformat data reproduced from the header area of the sector, and data reproduction with reference to the storage contents of the storage means. The sector address information of the specified sector and Determining means for determining the continuity with the sector address information of the succeeding sector to be reproduced, and when the determining means determines that there is continuity, the data recording of the predetermined sector stored in the buffer means Control means for permitting transfer of the data reproduced from the area to a host device. 2. When the determining means determines that the continuity does not exist, the control means controls the data reproducing means to repeat reproducing the data from the data recording area of the predetermined sector. The disk drive according to claim 1, wherein: 3. When the number of repetitions reaches a preset number, the control means notifies the host device of an error and controls the data reproducing means to terminate the reproducing operation. 3. The disk drive according to claim 2, wherein: 4. The apparatus according to claim 1, further comprising selection means for selecting whether or not to use the determination result of said determination means, wherein said control means, when it is selected by said selection means, to use said determination result. 2. The apparatus according to claim 1, wherein a decision is made as to whether or not to permit the transfer of the data reproduced from the data recording area of the predetermined sector to the higher-level device, based on a result of the judgment by the judging means. Disk drive. 5. The disk drive according to claim 4, wherein said selection means selects whether or not to use the result of determination by said determination means under the control of said higher-level device. 6. When the sector address information of a succeeding sector subsequent to the reproduced predetermined sector cannot be correctly reproduced by the data reproducing unit, the control unit reads the sector address information of the predetermined sector stored in the buffer unit. 2. The disk drive according to claim 1, wherein transfer of the reproduced data to a host device is suspended. 7. When the sector address information of the succeeding sector following the reproduced predetermined sector cannot be correctly reproduced by the data reproducing unit, the control unit repeats reproducing the data from the data recording area of the predetermined sector. 7. The disk drive according to claim 6, wherein said data reproducing means is controlled as described above. 8. When the number of repetitions reaches a preset number, the control means notifies the host device of an error and controls the data reproducing means to terminate the reproducing operation. The disk drive according to claim 7, wherein: 9. A disk drive for handling a disk-shaped recording medium in which a sector as a recording unit is formed by a header area in which preformat data including sector address information is recorded, and a data recording area following the header area. Data reproducing means for reproducing the preformat data from the header area of the sector and reproducing the data from the data recording area of the sector; and reproducing the data from the data recording area of the sector by the data reproducing means. Buffer means for temporarily storing the data, and judging means for judging whether or not sector address information of a succeeding sector following the predetermined sector from which the data has been reproduced has been correctly reproduced. When it is judged that the sector address information of Disk drives, characterized in that it comprises a control means for controlling the data reproduced from the data recording area of the predetermined sectors stored in Ffa means so as not to transfer to the host device. 10. When the sector address information of a succeeding sector following the reproduced sector is not correctly reproduced by the data reproducing unit, the control unit repeats reproducing the data from the data recording area of the predetermined sector. 10. The disk drive according to claim 9, wherein said data reproducing means is controlled as described above. 11. When the number of repetitions reaches a preset number, the control means notifies the host device of an error and controls the data reproducing means to terminate the reproducing operation. Claim 1.
0. The disk drive according to item 0. 12. The apparatus according to claim 11, further comprising a selection unit for selecting whether or not to use the determination result of the determination unit, wherein the control unit determines whether to use the determination result by the selection unit. 10. The apparatus according to claim 9, wherein it is determined whether to permit the transfer of the data reproduced from the data recording area of the predetermined sector to the higher-level device, based on a determination result of the means. Disk drive. 13. The disk drive according to claim 12, wherein said selecting means selects whether or not to use the result of judgment by said judging means under the control of said higher-level device. 14. A disk drive for handling a disk-shaped recording medium in which a sector as a recording unit is formed by a header area in which preformat data including sector address information is recorded, and a data recording area following the header area. Reproducing the preformat data from the header area of the sector and reproducing the data from the data recording area of the sector; and the data reproduced from the data recording area of the sector. In the buffer means, and storing the sector address information extracted from the preformat data reproduced from the header area of the sector in the storage means, with reference to the storage contents of the storage means, The sector address of the specified sector from which data was reproduced Determining the continuity of the address information and the sector address information of the succeeding sector reproduced after the predetermined sector; and when the continuity is determined to be continuous, the continuity is stored in the buffer means. Permitting transfer of the data reproduced from the data recording area of the predetermined sector to a higher-level device. 15. The data reproduced from a data recording area of the predetermined sector stored in the buffer means when sector address information of a succeeding sector following the reproduced predetermined sector cannot be correctly reproduced by the data reproducing means. The method according to claim 14, further comprising a step of suspending transfer of the data to the host device. 16. A disk drive for handling a disk-shaped recording medium in which a sector as a recording unit is formed by a header area in which preformat data including sector address information is recorded, and a data recording area following the header area. Reproducing the preformat data from the header area of the sector and reproducing the data from the data recording area of the sector; and the data reproduced from the data recording area of the sector. In the buffer means, and when the sector address information of the succeeding sector following the predetermined sector from which the data has been reproduced cannot be correctly reproduced, the data reproduced from the data recording area of the predetermined sector stored in the buffer means. Do not transfer data to the host device Controlling the data in the disk drive.