JPH08203252A - Method and apparatus for detecting address - Google Patents

Abstract

PURPOSE: To detect a segment address and a track address from a sector address by a simple operation or in a simple circuit constitution. CONSTITUTION: The method and an apparatus for detecting a segment address and a track address from a sector address are provided. A control part 4 sequentially compares data of a comparison segment count (HSD) with data of a total segment count while gradually multiplying the data HSD by 1/2. When TSD<HSD is held, a bit 0 is set to a track address register 10. When TSD> HSD is held, a bit 1 is set to the track address register 10, and at the same time, data of a new total segment count is formed by an operation TSD-HSD. The above operation is carried out in a loop. The final TSD is detected as a segment address. A value finally stored in the track address register 10 is detected as a track address.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for an address detecting method and address provided in a recording device, a reproducing device, a recording / reproducing device or the like of a disk-shaped recording medium such as a magnetic disk, a magneto-optical disk, a compact disk and a write once. More specifically, the present invention relates to a detection device, and a sector supplied from an external device when performing access control to a disk-shaped recording medium in which sector addresses of sectors composed of a plurality of segments are not recorded, based on segment addresses and track addresses. The present invention relates to an address detecting method and an address detecting device for detecting the segment address and the track address based on the address.

[0002]

2. Description of the Related Art Today's storage media are, for example, magnetic disks, magneto-optical disks, compact disks, because of their large storage capacity, semi-permanent storage of stored contents, and high-speed access. Disc-shaped recording media such as discs have become mainstream.

In such a disk-shaped recording medium, for example, a so-called tock table stores tok data such as recording addresses, recording times, recording dates and times of all stored contents.
In addition, a series of addresses are given at predetermined intervals on the board. Therefore, on the drive side, prior to recording / reproduction, while referring to the above-mentioned tok data, while reproducing a series of addresses provided at the predetermined intervals,
The recording system or the reproduction system is moved to the address designated by the user to perform the recording / reproduction.

As a result, desired data can be recorded or reproduced at the address designated by the user.

[0005]

The applicant of the present application has proposed an optical disc and a recording / reproducing apparatus thereof in the specification and drawings of Japanese Patent Application No. 6-200877. This optical disc has a format in which the sector address for recording / reproducing does not exist on the optical disc, and the sector division is not track intermittent. 1
A sector is composed of a plurality of segments and represents one unit of recording and reproduction. And, for example, on the computer side,
Since the data is handled in units of sectors, designation of recording / reproduction is also performed based on the sector address. On the other hand, the drive side handles data in segment units and track units.

Therefore, on the drive side, it is necessary to convert the sector address from the computer side into a segment address and a track address to deal with it.

As a method of converting the sector address into the segment address and the track address, the segment address and the track address corresponding to the sector address are stored in advance in the conversion table, and the conversion is performed every time the sector address is supplied. A method of detecting the segment address and the track address by referring to the table can be considered.

However, since the number of sectors on one optical disk is several hundreds of thousands, a large-scale memory is required to configure the above conversion table, which is costly and installation area is large. Is also not preferable.

If, for example, a series of sector addresses are given from the outer circumference side to the inner circumference side of the optical disk, the sector address supplied from the computer side is multiplied by the number of segments common to each sector. , This multiplication value is divided by the number of segments common to each track, the quotient is used as the track address, and the remainder is detected as the segment address.
A method using a processor (DSP) is also conceivable.

(Sector address x number of segments per sector) / number of segments per track = quotient is the track address and the remainder is the segment address. However, the multiplication part in such arithmetic processing can be executed without any particular problem. As for the division part, a complicated program is required, which is difficult to realize in terms of program length and execution time. Further, as the DSP, an inexpensive and small fixed-point arithmetic processor is usually used in consideration of cost and installation area. However, in this fixed-point arithmetic processor, the division processing in which the quotient is 1 or more is complicated. And it takes a long time.

If a floating-point arithmetic processor is used instead of the fixed-point arithmetic processor, the above-mentioned division processing can be performed at high speed and easily. However, since this floating-point arithmetic processor is large and expensive, a disk is required. Not suitable for installation in general-purpose equipment such as drives.

The present invention has been made in view of the above problems, and it is possible to detect a segment address and a track address on the basis of a sector address by a simple arithmetic process even by using the fixed point arithmetic processor. An object of the present invention is to provide an address detection method and an address detection device that can be used.

[0013]

According to an address detecting method of the present invention, a segment address and a track address in a disk-shaped recording medium in which a sector address of a sector composed of a plurality of segments is not recorded are supplied from an external device. This is an address detection method for detecting based on the sector address.

More specifically, the first step of multiplying the sector address supplied from the external device by the number of segments per sector to obtain the initial total number of segments, and one track common to all tracks The second step of multiplying the number of segments per hit by the power of 2 which is the closest value to the total number of segments on the disk-shaped recording medium, and making this the initial comparison segment number. A third step of forming the new comparison segment number by multiplying the initial comparison segment or the new comparison segment number by at least 1/2; and the initial total segment number,
It has a fourth step of successively comparing the new total segment number, the initial comparison segment number, and the new comparison segment number. Further, in the successive comparison performed in the fourth step, when the initial comparison segment number or the new comparison segment number becomes smaller than the initial total segment number or the new total segment number, the initial total segment number or the new total segment number is newly added. The fifth step of subtracting the initial comparison segment number or the new comparison segment number from the total total segment number to form a new total segment number, and the initial comparison segment number or the new comparison segment number is the initial total segment number. 0 if the number of segments or the new total segment number is larger, or 1 if the initial comparison segment number or the new comparison segment number is smaller than the initial total segment number or the new total segment number. , At least binary support And a sixth step of storing set in the storage means.

Then, the third step to the sixth step are repeated by the number of powers used in forming the comparison segment in the second step + 1 times, and finally stored in the storage means. The value indicated by a binary number is used as the track address, and the final total number of segments is used as the segment address.

The address detecting method according to the present invention is
It is an address detection method for detecting a segment address and a track address from a sector address when a disc-shaped recording medium whose entire area is divided into a plurality of zones along the radial direction is used as the disc-shaped recording medium.

In this case, the external device designates the sector address by the sector address continuously added from the beginning of each zone. On the other hand, in the first step, the sector address of the zone supplied from the external device is multiplied by the number of segments per sector that is different for each zone, and this is set as the initial total segment number, In the second step, the number of segments per track common to each zone is multiplied by the power of 2 which is the value closest to the number of segments of the zone having the largest number of segments, and this is calculated. Number of initial comparison segments.

Next, the address detecting apparatus according to the present invention is
It is an address detection device for detecting a segment address and a track address in a disk-shaped recording medium in which sector addresses of sectors composed of a plurality of segments are not recorded, based on sector addresses supplied from an external device.

Specifically, the sector address supplied from the external device is multiplied by the number of segments per sector, and the first multiplication means for outputting the result as the initial total number of segments is common to each track. A second multiplication means for multiplying the number of segments per track by a power of 2 which is the closest value to the total number of segments on the disk-shaped recording medium, and outputting this as the initial comparison segment number. . Third multiplication means for gradually multiplying the initial comparison segment number and the new comparison segment number by at least 1/2, the initial total segment number and the initial comparison segment number, the initial total segment number and the new comparison segment number. Alternatively, it has a comparison means for sequentially comparing the new total segment number and the new comparison segment number. Further, the initial comparison segment number is subtracted from the initial total segment number, and the new comparison segment number is subtracted from the initial total segment number, or
A subtraction unit that subtracts a new comparison segment number from the new total segment number and supplies this to the comparison unit as a new total segment number, and a value corresponding to the comparison result in the comparison unit are stored.
And a storage unit corresponding to a base number. Then, based on the comparison output from the comparison means, the initial comparison segment number, the new comparison segment number and the initial total segment number,
The new total segment count is detected, and when the initial comparison segment count or new comparison segment count becomes smaller than the initial total segment count or new total segment count, the initial total segment count or new total segment count is detected. The initial comparison segment number or the new comparison segment number is subtracted from the segment number, and the subtraction means is controlled so as to supply this to the comparison means as the new total segment number. When the number of comparison segments is larger than the initial total number of segments or the new total number of segments, 0 is set, and the initial number of comparison segments or the new number of comparison segments is larger than the initial total number of segments or the new total segment number. Is also small In this case, the storage means is controlled so as to store 1, and when the comparison means completes the comparison operation of the number of powers used to form the comparison segment + 1 times, the storage means is finally stored. The value indicated by the binary number stored in is the track address, and
And a control means for detecting the final total segment number as a segment address.

The address detecting device according to the present invention is
This is an address detection device that detects a segment address and a track address from a sector address when a disk-shaped recording medium whose entire area is divided into a plurality of zones along the radial direction is used as the disk-shaped recording medium.

In this case, the external device designates the sector address by the sector address continuously assigned from the head of each zone. On the other hand, the first multiplication means multiplies the sector address of the zone supplied from the external device by the number of segments per sector which is different for each zone, and sets this as the initial total segment number, The second multiplication means multiplies the number of segments per track common to each zone by the power of 2 which is the value closest to the number of segments in the zone having the largest number of segments. , Which is the initial comparison segment number.

[0022]

In the address detecting method according to the present invention, the third step to the sixth step are repeated for the number of powers used in forming the comparison segment in the second step + 1 times. As a result, when the total number of segments becomes larger than the comparison segment number for the first time, 1 is stored in the storage unit as the most significant bit, and thereafter, the total segment number becomes the comparison segment number. If the total number of segments is smaller than the number of comparison segments, 0 is set.
Each is stored in the storage means.

Therefore, the value stored in the storage means indicates the track address at the time when the repeated calculation is completed, and the final total number of segments indicates the segment address.

In this way, the address detecting method detects the segment address and track address from the sector address.

Next, the address detecting device according to the present invention is
The control means, based on the comparison output from the comparison means,
The size of the initial comparison segment number, the new comparison segment number, the initial total segment number, and the new total segment number is detected, and the initial comparison segment number or the new comparison segment number is the initial total segment number or the new total segment number. When it becomes smaller than the above, the initial comparison segment number or the new comparison segment number is subtracted from the initial total segment number or the new total segment number, and this is supplied to the comparison means as the new total segment number. The subtraction means is controlled.

If the initial comparison segment number or the new comparison segment number is larger than the initial total segment number or the new total segment number, 0 is set, and the initial comparison segment number or the new comparison segment number is set. However, if it is smaller than the initial total segment number or the new total segment number, the storage means is controlled to store 1.

As a result, when the total number of segments first becomes larger than the number of comparison segments, the storage means stores 1 as the most significant bit in the storage means.
Is stored in the storage means. If the total number of segments is larger than the comparison segment number, 1 is stored in the storage means, and if the total number of segments is smaller than the comparison segment number, 0 is stored in the storage means.

Therefore, in the comparison means, when the comparison operation of the power +1 used when forming the comparison segment is completed, the value finally represented by the binary number stored in the storage means is changed. It indicates the track address, and the final total number of segments indicates the segment address.

The address detecting apparatus detects the segment address and track address from the sector address in this way.

[0030]

Embodiments of an address detecting method and an address detecting apparatus according to the present invention will be described below in detail with reference to the drawings.

First, the address detecting apparatus according to the embodiment of the present invention has a structure as shown in FIG. The address detecting method according to the present invention is applied to the address detecting device according to this embodiment.

The address detecting apparatus according to the present embodiment shown in FIG. 1 corresponds to a disk-shaped recording medium in which the whole area is divided into, for example, 16 zones along the radial direction and sector addresses are not recorded. The segment address and track address on the disk-shaped recording medium are detected based on the zone number and sector address supplied from the computer side.

That is, the address detecting apparatus according to the present embodiment stores the number of different segments for each zone in advance, and outputs the segment number data indicating the number of segments according to the zone number supplied from the computer side. And a first multiplier 2 that forms the initial total segment number data by multiplying the segment number data and the sector address supplied from the computer side.

Further, the address detecting device described above uses track segment number data indicating the number of segments per track that are common to all tracks and 2 ^{10 which} will be described later.
A second multiplier 3 that multiplies the data with data to form initial comparison segment number data, and a total segment number register 5 that stores the initial total segment number data and new total segment number data described later.
And a comparison segment number register 6 for storing the initial comparison segment number data and new comparison segment number data described later.

The above-mentioned 2 ¹⁰ is smaller than 1696 because the largest one of the zones of the magneto-optical disk used in this embodiment has the number of tracks of 1696, and the number of 2 is 2. In this case, "2 ¹⁰ " is selected so as to be a value that is closest to 1696 in the power.

Further, the address detecting device compares the initial total segment number data or the new total segment number data with the initial comparison segment number data or the new comparison segment number data.
When the initial total segment number data or the new total segment number data is larger than the initial comparison segment number data or the new comparison segment number data, the initial comparison segment number data or the new total segment number data is used to perform the initial comparison. The subtractor 8 subtracts the segment number data or the new comparison segment number data to form new total segment number data and supplies it to the total segment number register 5.

Further, the address detecting device sets the number of times of loop processing in the address detecting device to the power number +1.
It has a loop counter 9 that counts down (ie, counts up) 11 times, and a track address register 10 that stores the track address formed by this loop processing.

Then, the address detecting device 1/1 / the new comparison segment number data or the initial comparison segment number data stored in the comparison segment number register 6 for each countdown performed by the loop counter 9.
Based on the comparison output from the comparator 7, the initial total segment number data or the new total segment number data is bit-shifted (shifted down) to the value of 2 and the initial comparison segment number data or the new comparison is performed. If it is smaller than the segment number data, "0" is set in the track address register 10, and in the opposite case, from the initial total segment number data or the new total segment number data, the initial comparison segment number data or The control section 4 controls the subtracter 8 and the total segment number register 5 so that the new comparison segment number data is subtracted and stored as new total segment number data.

The address detecting apparatus according to the present embodiment having such a configuration is a DSP 67 of a magneto-optical disk recording / reproducing apparatus for recording / reproducing recorded data on / from the magneto-optical disk 25 according to the sample servo system as shown in FIG. Can be applied.

The magneto-optical disk recording / reproducing apparatus is composed of a disk drive 21 and a control block 22. Then, commands and data are transmitted / received to / from the host computer 23 connected via the SCSI bus 24.

The disk drive 21 includes a spindle motor 26 for rotating the magneto-optical disk 25 at a constant speed, a spindle driver 27 for rotating the spindle motor 26, and the magneto-optical disk 25.
A loading mechanism 28 for mounting the same in the disc drive 21, a pickup 29 for irradiating the magneto-optical disc 25 with a laser beam, and the magneto-optical disc 25.
A laser diode 30 that emits a laser beam for irradiating a laser beam, a laser beam having a constant recording level when recording data, and a laser beam having a constant reproducing level when reproducing data. Thus, it has a laser driver 31 for driving the laser diode 30 to emit light.

The disk drive 21 receives the reflected light generated by irradiating the magneto-optical disk 25 with a laser beam, and forms a RF signal, a tracking error signal, a focus error signal, and the like, and a photodetector 32. A current-voltage conversion block (IV conversion block) 33 which converts the RF signal and the like supplied in the form of current from the photodetector 32 into a form of voltage, and amplifies and outputs these with a predetermined gain.
And a magnetic head 34 for applying a modulation magnetic field according to the data to the magneto-optical disk 25 at the time of data recording, and a magnetic head driver 35 for driving the magnetic head 34 according to the data to be recorded.

Next, the control block 22 controls the data processing block 45 and the servo control block 46 via the digital signal processor bus (DSP bus) 42 and the central processing circuit bus (CPU bus) 54. It is configured by connecting to 41.
The host computer 23 is connected to the controller 41 via the SCSI bus 24.

The data processing block 45 makes the laser level of the laser beam applied to the magneto-optical disk 25 constant according to the laser level detected in the forward path of the laser beam applied to the magneto-optical disk 25. Control (front auto power control: FA
Input / output block (I / O block) 43 to which FAPC data for PC is supplied, and D which converts the FAPC data to analog and supplies it to the laser driver 31.
And / A converter 44.

Further, the data processing block 45 controls the servo from a servo system timing generator (STG) 52 which will be described later on the magneto-optical signal (MO signal) and RF signal from the IV conversion block 33 of the disk drive 21. A selector & clamp circuit 47 that performs selection and clamp processing based on a timing clock for a control system, a servo clock generation circuit (SPLL) 49 having a phase locked loop configuration that generates a servo clock, and a phase clock that generates a data clock. And a data clock generation circuit (DPLL) 50 having a locked loop configuration.

Further, the data processing block 45 selects the servo clock or the data clock based on the timing clock from the STG 52, and the selector & clamp circuit 47.
A / signal for digitizing the RF signal or MO signal from the A / D with the clock selected by the clock selector 51.
And a D converter 48.

The data processing block 45 also includes a data system timing generator (DTG) 55 that forms a timing clock for data processing based on the data clock from the DPLL 50, and the DPLL 50.
The data to be recorded is supplied to the magnetic head driver 35 based on the data clock from the DTG 55 or the timing clock for data processing from the DTG 55, and the reproduced data is supplied to the host computer 23 via the controller 41. Circuit 56.

Next, the servo control block 46 selects and outputs the focus error signal, the FAPC signal and the tracking error signal from the I / V conversion block 33 of the disk drive 21 to the multiplexer 61.
And each signal from the multiplexer 61 to the SPL
A / D converter 62 for digitizing based on the servo clock from L49, I / O block 63 to which each A / D converted data is supplied, and digital signal processing of the magneto-optical disk recording / reproducing apparatus. And a digital signal processor (DSP) 67 for performing.

The servo control block 46 controls focusing / tracking of the pickup 29 and the I / O block 66 to / from which control data for controlling the rotation of the spindle motor 26 of the disk drive 21 is input / output. Pickup driver 64 that
It has a pulse width modulation circuit (PWM circuit) 65 for pulse width modulation driving the pickup driver 64.

The operation of the address detecting method and the address detecting apparatus according to this embodiment is programmed by this software, and controls the DSP 67. Then, the DSP 67 is an interruption operation by a subroutine, and based on the zone number and sector address supplied from the host computer 3 side through the controller 41, the magneto-optical disk 25.
The track address and the segment address are detected.

Next, the magneto-optical disk 25 used in the magneto-optical disk recording / reproducing apparatus is divided into, for example, a segment of 1400 per track as shown in FIG. 3, and the segment is an address segment ASEG.
And the data segment DSEG.

In the address segment ASEG, position information in the radial direction of the disc and position information in the tangential direction are recorded as prepits. Further, 100 address segments ASEG are provided every 14 tracks in one track, and one frame extends from the address segment ASEG to the next address segment ASEG. Further, the address segment ASEG exists for 100 frames per track,
13 segments between the address segments ASEG are data segments DSEG.

The above data segment DSEG is 1 in one revolution.
It is provided so that there are 300 segments. Further, this one segment is composed of 216 servo locks, and servo areas ARs and 19 for 24 servo clocks are provided.
It is formed of a data area ARd for two servo clocks.

In the case of the address segment ASEG, the data area ARd is the address area ARd.
a and the laser control area ARdwapc.

Next, in the servo area ARs, for example, as shown in FIG. 4, three pits P _A , P _B and P _C each having a length of 2 servo clocks are separated by 5 servo clocks or more. In addition to being recorded in advance, a focus sample area ARfs for 6 clocks is provided. Thus, the pits P _A , P of the servo area ARs
_{By making B} and P _C each two servo clocks long, the number of mirrors is reduced, making it difficult to generate ghost pits and the like that occur on the disk due to molding conditions, and to reduce the difficulty of pit generation. Therefore, it is possible to stably generate the servo signal. Further, by providing the pits P _A , P _B , and P _C at intervals of 5 servo clocks or more, the interference between the pits can be made extremely small.

The second pit P _B located in the 11 to 12 clock period and the third pit P _C located in the 16 to 17 clock period of the servo area ARs are each ± 1/4 track with respect to the center of the track. It is a wobbled pit that is offset only.

The magneto-optical disk recording / reproducing apparatus is as described above.
Each pit P_B, P_CBased on the difference in the amplitude value of the playback output of
Tracking error is detected by the
P_B, P _CThe difference between the amplitude values of both edges of the playback output of
The clock phase is controlled based on this. Well
In addition, the clock phase control should be performed by adding this phase information.
As a result, the accurate black that is not affected by the tracking
Clock phase control.

The first area at the beginning of the servo area ARs
The pit P _A indicates whether the segment is the address segment ASEG or the data segment DSEG, or the segment is the head of the sector or the next segment is the head of the sector. It is supposed to indicate.

Specifically, the first pit P _A is 9 to
If it is recorded to be located in the 10-clock period, it indicates that the segment is the data segment DSEG, and if it is recorded to be in the 2-3-clock period, the segment is the address segment ASEG. To indicate that. When the first pit P _A is recorded so as to be located in the 3-4 clock period, it indicates that the segment is the data segment DSEG which is the head of the sector, and in the 4-5 clock period. When it is recorded so as to be located, it indicates that the next segment is the data segment DSEG which is the head of the sector, and that it is the address segment ASEG.

The information indicated by the first pit P _A is, for example, as shown in FIG. 5, the maximum difference value detection.
It can be identified by examining the position taking the maximum amplitude value by the so-called differential detection method.

As described above, the magneto-optical disk 25 has
Since the first pit P _A is recorded at the beginning of the servo area ARs, it can be determined whether the segment is the address segment ASEG or the data segment DSEG, or it is at the beginning of the sector. It is possible to determine whether or not the next segment is the head of the sector, and it is possible to omit recording the sector number and track address in sector units. Therefore, in this magneto-optical disk 25, the redundancy of the data area is reduced as a whole.

Next, in the address segment ASEG, as shown in FIG. 6, track information [AM] of 16 bits is stored as information on the radial position of the disk.
An access code including [A2], [A3], [AL] and its parity [P], and a frame code indicating frame addresses [FM] and [FL] as tangential direction information are gray-coded, respectively. It is recorded as a pre-pit.

In the access code, a 16-bit track address is divided into 4 bits, and the access codes of adjacent tracks are recorded so that only one pattern changes.

Specifically, when the least significant bit of the above 4 bits is "1", the following 4 bits are AM-compared with the value obtained by taking the complement of 1 by using the gray code table shown in FIG. = 15 to 12 bits (MSN) to A2 = 11
~ 8 bits (2SN), A3 = 7 to 4 bits (3S
N) and the table conversion is performed in the order of AL = 3 to 0 bits (LSN), so that the access code of the adjacent track changes only by one pattern. Note that FIG.
Shows an example of the above access code.

As the parity code, each bit [15, 11, 7, 3], [14, 1 of the access code is used.
0, 6, 2], [13, 9, 5, 1], [12, 8,
The result of taking the parity which becomes 1 when the number of "1" for each 4,0] is an even number is recorded.

In the frame code, an 8-bit frame address representing the tangential direction number of the address segment ASEG is divided into 4 bits, and the upper 4 bits FM = 7 to 4 bits (MSN) and the lower 4 bits. Bits LM = 3 to 0 bits (MSN) are gray-coded and recorded in the same manner as the above access code. This frame code can record information of 8 bits, but in the case of the present embodiment, since the number of the address segment ASEG is 100, it exists only from 0 to 99.

The focus sample area ARfs of the servo area ARs serves as a mirror portion so as not to be subjected to pit modulation, and is used for focus, read power APC, RF signal clamping, and the like. It is difficult to specify the positions of various sample pulses for these processes, and fluctuations of ± 0.5 clocks or less are expected. Therefore, even if these fluctuations are added, they are affected by pit modulation. The space is 6 clocks so that sampling can be performed without fail.

Next, as shown in FIG. 8, the data area ARd of the data segment DSEG includes a data area ARda for 176 to 376 data clocks for recording normal data and a prewrite area ARpr for 12 data clocks. It is composed of a post-write area ARps for 4 data clocks.

The pre-write area ARpr is provided to be used as a clamp area for securing a distance required for preheating from laser irradiation to a stable temperature of the disk and for suppressing DC fluctuation due to birefringence of the MO signal. Has been.

The post-write area ARps is provided in order to eliminate the unerased portion by overwriting and to secure a distance to avoid interference from the groove edge.

This magneto-optical disk 25 can be used without requiring a formatting operation by bulk erasing in one direction at the time of shipping. And
The pre-write area ARpr and the post-write area ARps record data having the same polarity as the bulk erase direction, so that a stable signal can be obtained even if the pre-write area ARpr and the post-write area ARps are not normally recorded due to insufficient residual heat of the medium. .

The magneto-optical disk 25 has a groove Gr formed in the data area ARd. Since the groove Gr is not for tracking, accuracy such as depth thereof is not required.
By providing the groove Gr, it is possible to reduce a necessary mirror portion and reduce an adverse effect on the servo pit in forming the disk.

Although this is the case of the magneto-optical disk 25 for recording / reproduction, in the case of a read-only ROM disk, as shown in FIG. By providing the pit Pan, the mirror portion is reduced, and the adverse effect on the servo pit in forming the disk is reduced.

Next, one data sector has a reference area of 66 bytes and user data of 2048 bytes (D0 to D0).
D2047), ECC 256 bytes (E1,1 to E1
6, 16), CRC8 bytes (CRC1 to CRC8),
It is composed of a total of 2418 bytes including a vendor unique 8 bytes (VU) and a user defined 32 bytes (UD).

In the reference area, as shown in FIG. 10, an 8T pattern for 4 bytes and 2 for 12 bytes are provided.
The T pattern is defined as one block, and a fixed pattern of this one block is recorded for four blocks, and a specific pattern for 66 bytes is formed by a 2-byte all-0 pattern as a margin for setting the detected information. Is recorded.

The above 8T pattern is used for setting three-valued levels (high H, medium M, low L) in data detection, and 2
The T pattern is used to correct a DC pit position shift due to recording power fluctuation or the like during reproduction.

The reference area 66 is included in the data area ARd of the data segment DSEG.
Data other than bytes is scrambled, and NRZI data is recorded for each segment.

The magneto-optical disk 25 is a so-called zone CAV disk, and as shown in FIGS. 11 and 12, a GCP band of 736 tracks from the outer peripheral side, a buffer track of 2 tracks, a track of 5 tracks. Control track, 2 track buffer track, 5 track test track, 848 track user zone 0, 864 track user zone 1, 880 track user zone 2, 912 track user zone 3, 944 User zones for tracks 4, 976 user zones for tracks 5, 1024 user zones for tracks 6, 1056 user zones for 7 tracks, 1120 user zones for 8 tracks, 1
User zone 9 for 184 tracks, user zone 10 for 1216 tracks, user zone 11 for 1296 tracks, user zone 12, 1392 tracks
User zone 13 for 488 tracks, user zone 14 for 1696 tracks, user zone 15 for 770 tracks, test track for 5 tracks, buffer track for 2 tracks, control track for 5 tracks, buffer for 2 tracks It consists of tracks and 820 tracks of GCP bands.

Here, the number of tracks in the zone is TRAC.
zone, and the number of data segments required for one sector in a certain zone is DSEGsec-zone,
The number of data segments per track is DSEGtr
As the ack, when the sectors are completed for each zone and the number of sectors is fixed, the number of sectors in the zone SCT
zone is SCTzone = TRACzone / DSEGtrac
k / DSEGsect-zone, and the number of tracks may be determined so that TRACzone = K · DSEGsect-zone. And K
The number of sectors SCTzone, which is determined by using a value close to the capacity per zone divided by the zone with respect to the total capacity, is allocated from the outer circumference, and the recording density of the innermost circumference part of the zone All parameters can be obtained by determining the clock (M) so that the density does not drop below the density.

In this case, as shown in FIG. 13, when a sector starts from a certain segment, the number of segments forming one sector and the sector is terminated, and even if there is an extra byte in the last segment, the next sector is It is supposed to start from the next segment. As a result, at the beginning of the zone, it is possible to continuously configure sectors starting from the sector of 0 frame code.

Note that in the innermost zone, the number of sectors may not be the same as the number of sectors in other zones due to the relationship with the recording area, but there may be a fractional number. By setting the zone, the capacity of the parity sector can be easily calculated.

Among the above zones, the one having the maximum number of tracks has the number of tracks of 1696. Therefore, the input terminal 13 shown in FIG.
It was set to 2 ¹⁰ data supplied through, the 169
"2 ¹⁰ " is selected so that the value is smaller than 6 and is closest to 1696 in the power of 2.

Further, in the magneto-optical disk 25, the user zone is divided into 16 zones as described above, and the number of data bytes which enters one segment by the data clock DCLK multiplied by M / N of the servo clock SCLK ( byte / seg) and the number of segments per sector (seg / sector) are determined. That is, assuming that the number of servo clocks in the servo area ARs is N and the data clock is M / N of the servo clocks, the number of servo clocks in one segment SCLKseg
And the number of data clocks DCLKseg is SCLKseg = 9N DCLKseg = SCLKsegM / N. Note that N and M are integers.

Further, as described above, one track has 1400
It is divided into segments, and 1300 of these are data segments DSEG, but since no data is recorded in the GCP band, 100 segments of 1300 data segments DSEG contain GCP information such as media information. Keep GCP segment GCPs
As shown in FIG. 14, the GCP segment GCPseg, which is used as an egg, is assigned to the data segment at the intermediate position of each address segment ASEG.

Then, the GCP segment GCPseg
Shows the servo areas ARs and GCP as shown in FIG.
The GCP area ARgcp is composed of an area ARgcp and a blank ARblk. In the GCP area ARgcp, seven 4-bit data gray-coded by the same method as the access code, that is, [GCPH], [GCP2], [GCP3], [G
GCP code consisting of CPL] and its parity [P],
Further, the page numbers [PNH] and [PNL] are gray-coded and recorded in pits.

An error can be detected in the GCP code by adding a parity [P]. Also, by adding page numbers [PNH] and [PNL], a plurality of media information and the like can be given as GCP information. Page number [P
NH] and [PNL] are up to 16 pages,
By recording the same information in [PNH] and [PNL], it is possible to make it robust against errors.

In the above GCP area ARgcp,
GCP segment G of the last 1 digit of the address (frame number) recorded in the address segment ASEG
Set each GCP to match the page number of CPseg.
By arranging the segment GCPseg, misreading of the frame number of the address segment ASEG and the page number of the GCP segment GCPseg can be eliminated. Furthermore, 10 pages, that is, 10 types of G
By repeatedly recording the CP information 10 times, it is possible to reduce misreading of each of the 10 types of GCP information.

Next, the operation of the magneto-optical disk recording / reproducing apparatus according to this embodiment will be described.

As described above, this magneto-optical disk recording / reproducing apparatus is adapted to transmit / receive commands and data to / from the host computer 23 connected via the SCSI bus 24.

The processing for transmitting and receiving the above commands and data is performed by the controller 41 of the control circuit block 22, and this controller 41
At the time of recording, CRC or an error correction code is added to the data from the host computer 23 and supplied to the disc drive 21, and at the time of reproduction, the data from the disc drive 21 is error-corrected and only the user data portion is recorded. Transfer to the host computer 23. Further, commands to the servo system and each block of the disk drive 21 are performed by the DSP 67 which performs necessary processing for commands from the controller 41.

Specifically, when the magneto-optical disk 25 is mounted on the turntable by the loading mechanism 28, the DSP 67 responds to the request from the host computer 23 or to the set automatic spin-up mode. Then, the spindle driver 27 is instructed to rotate the spindle motor 26 via the I / O block 66. The spindle driver 27 outputs a lock signal when the spindle motor 26 reaches a predetermined rotation speed,
Notify the DSP 67 that the rotation is stable. Further, during this period, the DSP 67 performs pulse width modulation (PWM).
The pickup 29 is moved to the outer or inner side by the pickup driver 64 via the circuit 65 so that the beam spot is located outside the user area. If a disc with high sensitivity is loaded when focus is pulled in the user area, the data recorded there may be accidentally erased. For example, the GCP zone outside the user area may be erased. Such erroneous erasure can be prevented by pulling in the focus by, for example.

When the spindle motor 26 rotates at a constant speed and the pickup 29 moves to the outer peripheral side, for example, the DSP 67 causes the I / O block 43 to move to the D / A converter 4.
Pickup 2 for laser driver 31 via 4
The bias current LDbias of the laser diode 30 provided in FIG. 9 is set, and a command is issued to the STG 52 that controls ON / OFF of the laser diode 30 to emit laser light.

As a result, a laser beam is emitted from the laser diode 30 and applied to the magneto-optical disk 25. Then, the reflected light of the laser beam is generated, and the reflected light is received by the photodetector 32 provided in the pickup 29.

The photodetector 32 forms an MO signal and an RF signal based on the received light level of the reflected light, and also outputs a tracking error signal, a focus error signal and a FAPC signal for controlling the laser level of the laser beam. It is formed and these are supplied to the I / V conversion block 33.

The I / V conversion block 33 converts each of the signals supplied in the form of current into the form of voltage,
Selector & clamp circuit 4 for the above MO signal and RF signal
7 and the tracking error signal,
The focus error signal and the FAPC signal are supplied to the multiplexer 61. The multiplexer 61 time-divisionally selects the tracking error signal, the focus error signal, and the FAPC signal and supplies them to the A / D converter 62.

The A / D converter 62 outputs the tracking error signal, the focus error signal and the FAPC signal, which are supplied in a time division manner, to the SPLL circuit 4 described later.
Each of them is digitized based on the servo clock from 9 and these are converted to the DS through the I / O block 63.
Supply to P67.

The DSP 67 detects the laser level based on the FAPC data, and outputs the light amount control data calculated by the digital filter via the I / O block 43 and the D / A converter 44 to the laser driver 31.
The laser power of the laser diode 30 is controlled to be constant by feeding back to the laser diode.

Next, the DSP 67 includes a PWM circuit 65.
By passing a current through the focus driver of the pickup driver 64, the focus actuator of the pickup 29 is driven up and down to be in a focus search state described later. At this time, the magneto-optical disk 25
The reflected light from is detected by the photo detector 32,
The detection output of the photodetector 32 is converted into a voltage by the I / V conversion block 33, and the multiplexer 61 outputs it as a focus error signal via the matrix amplifier.
Is supplied to.

This focus error signal corresponds to the FAP
Similar to the C signal, it is digitized by the A / D converter 62 and supplied to the DSP 67 via the I / O block 43 as a signal selected by the multiplexer 41 in a time division manner.

The DSP 67 returns the focus control data obtained by digitally filtering the digitized focus error signal from the PWM circuit 65 to the focus driver of the pickup driver 64, thereby performing focus servo control. Form a servo loop for.

When the focus servo becomes stable, the amplitude of the RF signal obtained from the detection output of the photodetector 32 by the I / V conversion block 33 becomes constant to some extent, and after it is clamped to an appropriate potential by the selector & clamp circuit 47. A / D by A / D converter 48
D converted.

The sampling clock at this time is SP
This is the frequency of the free running state of LL49. Further, the clamping timing pulse has a frequency obtained by dividing the frequency in the free-run state by the STG 52.

The SPLL 49 checks the pit pattern by looking at the amplitude difference between the RF signals digitized by the A / D converter 48, and searches for the same pattern as the pit row in the servo area. Then, when a pattern is found, the clock selector 51 is controlled so as to open a window at the position where the next pattern should appear, and it is confirmed again whether the patterns match. If this operation is continuously confirmed a certain number of times, it is considered that the SPLL 49 has locked the disk. The phase information is obtained by taking the amplitude difference between both shoulders of the wobble pit in the servo area.
Further, by adding the phase information obtained from both of the two wobble pits, the gain fluctuation caused by the amplitude change due to the tracking position is absorbed.

When the SPLL 49 is locked, the position of each segment becomes clear, the position of the segment mark pit can be recognized, and the window is opened at the four positions A, B, C and D shown in FIG. The clock selector 51 is controlled to search for a position having the maximum amplitude among the RF signals sampled at these four positions A, B, C and D. When the result is A, it can be recognized that the pit is an address mark, and this segment is an address segment, which is the beginning of the frame. Therefore, frame synchronization can be achieved by clearing the frame counter.

Since one frame is composed of 14 segments, the clock selector 31 is controlled so that a window is opened every 14 segments, and when the address marks can be continuously recognized, it is judged that the frame synchronization is locked.

Since the position where the address is recorded can be recognized when the frame synchronization is applied, the address decoder (A
The DEC) 53 decodes the track address and the frame code. In this ADEC 53, it is performed by observing a pattern in which each 4 bits are gray-coded and the gray code table shown in FIG. 6 described above.

In the ADEC 53, the reproduced signals at the respective positions a, b, c and d shown in FIG. 6 are sampled, and the position where the amplitude value is maximum is found by the maximum difference detection method (differential detection method). Similarly, the reproduced signals at the positions e, f, g, and h shown in FIG. 6 are sampled, the position where the amplitude value is maximized is obtained, and decoding is performed by the combination of these and the gray code table. According to the above method, track addresses [AM] to [A]
L], parity [P], frame address [FM],
[FL] is decoded and the result is stored in the register.

The DSP 67 can detect the present position of the pickup 29 by reading this register when these data are confirmed. However, since it is greycoded not only for 4 bits but for the whole, it is not a simple match, but the LSB of the upper 4 bits.
Is compared with the inverted table depending on whether is "1" or "0".

Here, the first decoded frame code is loaded into the frame counter, and the numerical value obtained by incrementing this frame counter for each frame is compared with the actual reproduced frame code to continuously When it is confirmed that they match, it is assumed that rotation synchronization has been applied. After that, the numerical value obtained by the frame counter is returned to the DSP 67 as a frame code so that the frame position is not erroneously recognized even if there are some defects.

Further, the ADEC 53 decodes the GCP information in the same way as the track address and the frame code. However, not the address segment, but G
GCP segment in which CP information is recorded GCPse
By reading the register contents with g, the contents of the GCP area ARgcp can be confirmed.

Further, the DSP 67 reads the gray-coded track address and picks up the pickup 29.
The speed of the pickup 2 is calculated from the PWM circuit 65 via the slide driver of the pickup driver 64.
The pickup 9 is moved to the target track by controlling the slide motor of 9.

When the pickup 29 arrives at the target track, the tracking operation is started. As described above, the tracking error signal is obtained by taking the difference between the amplitude values of the RF signal for the two wobble pits in the servo area. The DSP 67 forms a servo loop for tracking control by feeding back this value as tracking control data obtained by digitally filtering it from the PWM circuit 65 to the galvano driver and the slide driver of the pickup driver 64. The slide motor is driven by the slide driver to control the fluctuation of the low frequency component, and the galvano driver is used for the pickup 29.
The tracking control is performed so that the laser spot is located at the center of the track by driving the galvano motor of.

The head position of the target sector is detected with such tracking applied. As described above, there is a sector mark in the segment at the beginning of each sector and the segment immediately before it. Each sector mark controls the clock selector 51 so as to open a window at the four positions A, B, C, D shown in FIG. 5, and is sampled at these four positions A, B, C, D. When the position of maximum amplitude in the RF signal is B, it indicates that it is the head segment of the sector, and when it is C, it indicates that it is the segment immediately before the head of the sector. Basically, the first segment of the sector is the host computer 23.
It is determined by converting the sector address given by the above into a physical sector and calculating which segment of which track the sector is.
The probability that different types of sector marks will be defective at the same time is 10 ⁻¹⁰ or less empirically, and the probability of occurrence of defective sectors due to this is extremely small.

Further, the data clock generation (DPLL) circuit 50 generates a data clock dclk which is M / N times the frame-synchronized servo clock sclk obtained by the SPLL 49, and uses this data clock dclk for the data system timing. Generator (DTG)
55 and the recording / reproducing circuit 56.

At the time of recording, the recording / reproducing circuit 56
The print data is supplied from the host computer 23 via the controller 41. And the above record /
The reproduction circuit 56 outputs, for example, 127 to the recorded data.
Y = X ⁷ by adding (EXOR) the random numbers of the cycles
The scramble processing according to + X is performed on a sector-by-sector basis, and the scrambled recording data is transferred to the data clock dc.
Modulates to NRZI series data synchronized with lk. At this time, the initial value is set to “0” for each segment. Then, the modulated signal wdat is supplied to the magnetic head 34 via the magnetic head driver 35. The magnetic head 34
Generates a magnetic field according to the modulation signal wdat, and the magneto-optical disk 2 is overheated to the Curie temperature by the laser beam emitted from the laser diode 10.
By applying to the data area ARd of No. 5, NRZ
Record I-series data.

During reproduction, the MO signal obtained by the I / V conversion block 33 from the output detected by the photodetector 32 is clamped to an appropriate potential by the selector & clamp circuit 57 and then the A / D converter 48.
It is A / D converted by and is supplied to the recording / reproducing circuit 56. Then, the recording / reproducing circuit 56
The MO signal digitized by the D / D converter 48 is subjected to digital filter processing that matches the partial response (1, 1), and then NRZ is performed by Viterbi decoding.
Reproduce the I-series data. Then, the NRZI series data is converted into NRZ system in segment units, then descrambled in sector units and then converted into reproduction data, and the reproduction data is transferred to the host computer 23 via the controller 41.

By scrambling the recorded data in this way, the data pattern is randomized, the probability that an undetermined path will continue during Viterbi decoding is reduced, and the memory capacity can be reduced. By randomizing the pit arrangement on the ROM disk, the ratio of the presence or absence of pits on the board surface approaches 50%, and disk molding can be facilitated.

Next, the operation of detecting the track address and the segment address of the magneto-optical disk recording / reproducing apparatus according to this embodiment will be described.

As described above, the track address and the segment address are detected by the subroutine of the DSP 67, and its flowchart is as shown in FIG.

First, when recording or reproducing data, the host computer 23 divides the magneto-optical disk 25 into zones, so that the zone number and the sector number from the beginning of the zone are set as the sector. It is transmitted to the controller 41 as an address. The controller 41 receives this sector address and sends it to the D
Supply to SP67. The DSP 67 fetches this sector address by a subroutine, and the flow chart shown in FIG. 16 is started and the process proceeds to step S1. In step S1, the DSP 67 forms initial total segment number data.

That is, to explain with the functional block diagram shown in FIG. 1, the DSP 67 supplies the zone number data indicating the zone number in the sector address to the segment number table through the input terminal 14 and Sector number data indicating the number is input terminal 11
Is supplied to the first multiplier 2 via.

Since the number of segments per sector differs depending on the zone, the segment number table 1 stores the number of segments included in each zone indicated by the zone number data. Therefore, when the zone number data is supplied, the segment number table 1 supplies the segment number data corresponding to the zone to the first multiplier 2.

The first multiplier 2 has the input terminal 11
By multiplying the sector number data supplied via the above and the segment number data, initial total segment number data indicating the total segment number of the zone is formed, and this is supplied to the control unit 14. The control unit 4 stores and controls the total segment number register 5 so as to store the initial total segment number data.

Next, in step S2, the control section 14 resets (initializes) the track address register 10 and proceeds to step S3.

In step S3, the DSP 67
Supplies the segment number data per track common to each track to the second multiplier 3 via the input terminal 12 and the 2 ¹⁰ data to the second multiplier 3 via the input terminal 13. . Then, in the second multiplier 3, the number of segments per track and 2
^The initial comparison segment number data is formed by performing a multiplication process with ¹⁰ data, and this is supplied to the control unit 4, and the process proceeds to step S4.

At step S4, the control section 4
The comparison segment number register 6 is stored and controlled so as to store the initial comparison segment number data, and the loop counter 9 is reset to proceed to step S5. Since the loop counter 9 counts down, the count value is reset to 11 in step S4.

Next, in step S5, the control section 4
The initial total segment number data stored in the total segment number register 5 and the initial comparison segment number data stored in the comparison segment number register 6 are read out and supplied to the comparator 7. The comparator 7 compares the initial total segment number data with the initial comparison segment number data, and supplies the comparison result to the control unit 4. The control unit 4 determines the size of the initial total segment number data and the initial comparative segment number data based on the comparison result. If the initial comparative segment number data is larger than the initial total segment number data, the process proceeds to step S6. ,
If the initial comparison segment number data is smaller than the initial total segment number data, the process proceeds to step S7.

At step S6, the control section 4
Since the initial comparison segment number data is larger than the initial total segment number data, bit 0 is set in the track address register 10 and the process proceeds to step S9.

On the other hand, in step S7, since the initial total segment number data is larger than the initial comparison segment number data, the control section 4 sends the initial total segment number data and the initial comparison segment number data to the subtractor 8. Supply. The subtractor 8 subtracts the initial comparison segment number data from the initial total segment number data to form new total segment number data, and supplies the new total segment number data to the control unit 4. The control unit 4 sets the new total segment number data in the total segment number register 5 and proceeds to step S8.

In step S8, the initial total segment number data is larger than the initial comparison segment number data, so the control unit 4 sets 1 as the most significant bit in the track address register 10 and proceeds to step S9. .

At step S9, the control section 4
The initial comparison segment number data stored in the comparison segment number register 6 is downshifted by 1 bit to form new comparison segment number data in which the initial comparison segment number data is 1/2. Proceed to S10.

In step S10, the control section 4
Decrement the loop counter 9 by 1 and set the counter value to 1
The process proceeds to step S11 with 0.

In step S11, the control unit 4
However, it is determined whether or not the count value of the loop counter 9 becomes zero. Then, if NO, the process returns to step S5, and if YES, the process proceeds to step S12.

Again, in step S5, the control section 4 reads out new total segment number data and new comparison segment number data from the total segment number register 5 and the comparison segment number register 6, respectively, and compares them with each other. Supply to 7. The above comparator 7
Compares the new total segment number data with the new comparison segment number data, and supplies the comparison result to the control unit 4. Based on the comparison result, the control unit 4 discriminates between the two. If the new comparison segment number data is larger than the new total segment number data, the process proceeds to step S6, and vice versa. If the new comparison segment number data is smaller than the total segment number data, the process proceeds to step S7.

In step S6, the new comparison segment number data is larger than the new total segment number data, so the control unit 4 sets bit 0 in the track address register 10 and proceeds to step S9.

On the other hand, in step S7, since the new total segment number data is larger than the new comparison segment number data, the control unit 4 causes the new total segment number data and the new comparison segment number data to be obtained. Is supplied to the subtractor 8. The subtractor 8 again forms new total segment number data by subtracting new comparison segment number data from the new total segment number data, and supplies this to the control unit 4. The control unit 4 sets the re-formed new total segment number data in the total segment number register 5 and proceeds to step S8.

In step S8, step S7
Since it is determined that the new total segment number data is larger than the new comparison segment number data, the control unit 4 sets bit 1 in the track address register 10 and proceeds to step S9.

In step S9, the control section 4
By shifting down the new comparison segment number data stored in the comparison segment number register 6 by 1 bit, the value of the new comparison segment number data is 1 /
As the value of 2, new comparison segment number data is formed again, and the process proceeds to step S10.

In step S10, the control section 4 decrements the count value of the loop counter 9 by one, sets the count value to 9, and proceeds to step S11.

In step S11, the control unit 4
Discriminates whether or not the count value of the loop counter 9 has become 0, and in the case of NO, returns to the above step S5 and
In the case of S, the process proceeds to step S12.

Thereafter, YES in the above step S11.
Until it is determined that the above steps S5 to S11.
The routine will be repeated. If it is determined in step S5 of this loop that the initial comparison segment number data or the new comparison segment number data is larger than the initial total segment number data or the new total segment number data, In step S6, bit 0 is set in the track address register 10, and conversely, if the initial comparison segment number data or the new comparison segment number data is smaller than the initial total segment number data or the new total segment number data. If determined, bit 1 is set in the track address register 10 in step S7.

Therefore, in the track address register 10, the initial comparison segment number data or the new comparison segment number data is first stored in the step S5 rather than the initial total segment number data or the new total segment number data. Bit 1 set when it is determined that the smaller one is the most significant bit,
In the track address register 10, track address data of 1 and 0 according to the above determination result is formed.

In step S12, the control unit 4
However, the total segment number data finally stored in the total segment number register 5 at the time when the loop of 11 times is finished is used as a segment address, and this is output as segment address data through the output terminal 16, and The track address data stored in the track address register 10 is read and output through the output terminal 15, and the whole routine shown in the flowchart of FIG. 16 is completed.

Specifically, as shown in FIG. 17, for example, the sector address data indicating the 10000th sector of the 0th zone (the outermost zone) is supplied from the host computer 3 and the segment address corresponding to this is supplied. When detecting a track address, the zone number (0th zone) is supplied to the segment number table 1 through the input terminal 14 shown in FIG. 1, and the sector number (10th zone) is supplied.
000 sectors) is supplied to the first multiplier 2 via the input terminal 11.

Since the number of segments per sector in the 0th zone is 53, the segment number table 1
Supplies the segment number data of 53 to the first multiplier 2.

The second multiplier 2 multiplies the segment number data 53 by the sector number 10000 to form 530000 initial total segment number data and supplies it to the control unit 4. The control unit 4 is
This initial total segment number data is set in the total segment number register 5.

On the other hand, the segment number data per track is the same in all zones and is 1300. Therefore, in the second multiplier 3, the 1300 is multiplied by 1024 which is 2 ^10. By 133
The initial comparison segment number data of 1200 is formed, and this is supplied to the control unit 4. The control unit 4 transfers the initial comparison segment number data to the comparison segment number register 6
Set to.

Next, the control section 4 reads the initial total segment number data and the initial comparison segment number data from the total segment number register 5 and the comparison segment number register 6, and supplies them to the comparator 7. The comparator 7 compares the initial total segment number data of 530000 and the initial comparison segment number data of 1331200.

In this case, since the initial comparison segment number data is larger than the initial total segment number data, the control section 4 causes the track address register 10
Is set to 0 and the initial comparison segment number data of 1331200 stored in the comparison segment number register 6 is downshifted by 1 bit to reduce the initial comparison segment number data to 1/2. The new comparison segment number data of 665600 is formed, and this is set in the comparison segment number register 6.
Then, again, the size of the initial comparison segment number data of 530000 and the new comparison segment number data of 665600 are compared.

In this case, since the new comparison segment number data is still larger than the initial total segment number data, the control unit 4 sets bit 0 in the track address register 10 and the comparison segment number data. By shifting down the new comparison segment number data of 665600 stored in the register 6 by 1 bit, the new comparison segment number data is set to 1
332800 new comparison segment number data having a value of / 2 is formed, and this is set in the comparison segment number register 6. Then, again, the initial comparison segment number data of 530000 and the new comparison segment number data of 332800 are compared in size.

As a result, the new comparison segment number data becomes smaller than the initial comparison segment number data. Therefore, the control unit 4 uses the subtracter 8 to set 53000.
332800 from the initial total segment number data of 0
197 by subtracting the new comparison segment number data of
200 new total segment number data are formed, and 1 is set in the track address register 10 as the most significant bit. Then, the new total segment number data is set in the total segment number register 5.

Next, the control section 4 controls the 332800.
16640, which is the new comparison segment number data of 1/2
It is set to 0, and this is compared with the new total segment number data of 197200.

In this case also, since the new total segment number data is larger than the new comparative segment number data, the control unit 4 determines that the new total segment number data of 197200 is 166400. The data is subtracted to form new total segment number data of 30800 and set in the total segment number register 5, and 1 is set to the bit next to the most significant bit of the track address register 10.

Next, the control unit 4 controls the 166400.
New comparison segment number data of 1/2 of 83200
Then, this is compared with the new total segment number data of 30800.

In this case, since the new total segment number data is smaller than the new comparison segment number data, the control unit 4 sets the next bit next to the most significant bit of the track address register 10. Set to 0.

As described above, the control section 4 compares the initial comparison segment number data or the new comparison segment number data with the initial total segment number data or the new total segment number data while gradually reducing the value to 1/2. . Further, when the initial total segment number data or the new total segment number data becomes larger than the initial comparison segment number data or the new comparison segment number data, the initial total segment number data or the new total segment number data is initialized. The comparison segment number data or the new comparison segment number data is subtracted to form new total segment number data. If the initial total segment number data or the new total segment number data becomes larger than the initial comparison segment number data or the new total segment number data by comparing the above two sizes, the track address register Bit 1 is set in 10 and bit 0 is set in the track address register 10 in the opposite case.

Then, such comparison and subtraction are performed by 11
By repeating this operation, data of 110010111 (indicating the track address of 407) is finally set in the track address register 10, and 900 new total segment number data is set in the total segment number register 5. Is set. The control unit 4 outputs the data of 110010111 finally set in the total segment number register 5 as track address data, and the 900 new data finally set in the total segment number register 5. The total segment number data is output as segment address data.

A further example will be explained. For example, referring to FIG.
Suppose that the sector address data indicating the 1995th sector of the 10th zone is supplied from the host computer 3 as shown in FIG. 3, the initial total segment number data of 151620 is formed by the first and second multipliers 2 and 3. (Because the number of segments per sector in the 10th zone is 76, 76 × 1995 = 151620), 1
331200 initial comparison segment number data is formed (1300 × 1024 = 1331200).

The control unit 4 gradually compares the initial comparison segment number data or the new comparison segment number data with the initial total segment number data while gradually halving the data as described above, and the loop counter 9 of FIG. When the initial total segment number data becomes larger than the new comparison segment number data, 1 is set as the most significant bit in the track address register 10 as shown in the counter value 7 and the initial total of 151620 is set. A new comparison segment number data of 83200 is subtracted from the segment number data to form a new total segment number data of 68420, which is set in the total segment number register 5.

Then, such comparison and subtraction are performed by 11
By repeating this operation, the data of 1110100 (indicating the track address of 116) is finally set in the track address register 10, and 820 of new total segment number data is set in the total segment number register 5. Is set.

The controller 4 sets the 1110100 which is finally set in the total segment number register 5.
While outputting the data as the track address data, the new total segment number data of 820 finally set in the total segment number register 5 is output as the segment address data.

The DSP 67 uses the track address and segment address thus detected to
The pickup 29 and the like are controlled via the pickup driver 44 so as to record or reproduce data.

Since the magneto-optical disc recording / reproducing apparatus can detect the track address and the segment address based on the sector address supplied from the host computer 23 side by such a simple program operation, the sector address is detected. It is not necessary to provide a conversion table or the like for detecting the track address and the segment address, so that the cost can be reduced and the installation area can be omitted.

Further, this calculation is based on multiplication processing (first, second
2 and 3), bit shift (comparison segment number register 6), comparison processing (comparator 7) and subtraction processing (subtractor 8), so that the quotient becomes 1 or more. The calculation can be made unnecessary, and the calculation can be performed using an inexpensive and small fixed-point arithmetic processor.
Therefore, since the fixed-point arithmetic processor can be used, it can be realized at low cost and in a small size.

Further, since no special instruction word is used, not only the DSP 67 but also a high-speed microcomputer can be realized.

In the above description of the embodiments, the address detecting method and the address detecting apparatus according to the present invention are applied to a so-called zone CAV magneto-optical disk recording / reproducing apparatus, but this is divided into zones. It may be provided in a magneto-optical disk recording / reproducing apparatus for recording / reproducing data by using a non-magneto-optical disk.

In this case, the number of segments per sector is common, and the host computer side supplies sector numbers assigned in series from the outer peripheral side to the inner peripheral side. Therefore, the initial total segment number data can be formed by multiplying the sector number by the segment number. Further, instead of the above 2 ¹⁰ data, 2 ^N data (N is a natural number) closest to the number of tracks in the entire recording / reproducing area is formed, and this is multiplied by the common number of segments per track. The initial comparison segment number data can be formed. Then, on the basis of the initial total segment number data and the initial comparison segment number data, the same arithmetic processing as described above is performed, which is N + 1 which is the above power.
By performing the batch operation, the track address and the segment address can be finally detected and output. As a result, the segment number table 1 required to detect the number of segments per sector from the zone number 1
Can be omitted, and further cost reduction can be achieved.

Finally, in the above description of the embodiments, the address detecting method and the address detecting apparatus according to the present invention are applied to the magneto-optical disk recording / reproducing apparatus which operates based on the sample servo system. The present invention is not limited to the servo system, and can be applied to, for example, a continuous servo system, and is also applicable to a reproducing device, a recording device, or a recording / reproducing device of another disk-shaped recording medium such as a magnetic disk, a compact disk, or a write once. Applicable. Besides, it goes without saying that various modifications can be made without departing from the technical idea of the present invention.

[0169]

The address detecting method and the address detecting apparatus according to the present invention can detect the segment address and the track address based on the sector address by a simple arithmetic process without performing a complicated division process. . Therefore, it is not necessary to provide a conversion table for converting a sector address into a segment address and a track address, and it is possible to reduce the cost of a device including the address detecting method and the address detecting device by reducing the number of parts and the installation area. You can contribute.

Further, since small-sized and inexpensive DSP such as a fixed-point arithmetic processor enables high-speed detection, it can be realized small-sized and inexpensive.
It is possible to contribute to cost reduction of a device provided with the address detection method and the address detection device.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an address detection method and an address detection device according to the present invention.

FIG. 2 is a block diagram of a magneto-optical disk recording / reproducing apparatus to which the address detecting method and the address detecting apparatus according to the present invention are applied.

FIG. 3 is a diagram showing a segment structure of a magneto-optical disk recorded / reproduced by the magneto-optical disk recording / reproducing apparatus.

FIG. 4 is a diagram showing a format of a servo area in the magneto-optical disk.

FIG. 5 is a diagram for explaining how to detect the first pit in the servo area of the magneto-optical disk.

FIG. 6 is a diagram showing a format of an access code recorded in an address segment of the magneto-optical disc.

FIG. 7 is a diagram showing an example of the access code.

FIG. 8 is a diagram showing a format of a data segment in the magneto-optical disc.

FIG. 9 is a diagram showing a format of a servo area in a ROM disc.

FIG. 10 is a diagram showing a reference pattern of a data sector in the magneto-optical disk.

FIG. 11 is a diagram showing setting parameters for zone division in the magneto-optical disk.

FIG. 12 is a diagram showing a state of zone division in the magneto-optical disk.

FIG. 13 is a diagram showing a data sector format in the magneto-optical disk.

FIG. 14 is a diagram showing an arrangement state of GCP segments in the magneto-optical disk.

FIG. 15 is a diagram showing a structure of the GCP segment.

FIG. 16 is a flow chart for explaining a segment address and track address detecting operation of the magneto-optical disk recording / reproducing apparatus in the example.

FIG. 17 is a diagram showing an example of a detection operation of the segment address and track address.

FIG. 18 is a diagram showing an example of a detection operation of the segment address and track address.

[Explanation of symbols]

1 Sector Segment Number Table 2 First Multiplier 3 Second Multiplier 4 Control Unit 5 Total Segment Number Register 6 Comparison Segment Number Register 7 Comparator 8 Subtractor 9 Loop Counter 10 Track Address Register 11 Sector Address Input Terminal 12 Number of segments per track Data input terminal 13 2 ¹⁰ Data input terminal 14 Zone number input terminal 15 Track address output terminal 16 Segment address output terminal

Claims (4)

[Claims] 1. An address detection method for detecting a segment address and a track address in a disk-shaped recording medium in which a sector address of a sector composed of a plurality of segments is not recorded, based on a sector address supplied from an external device. Therefore, the first step of multiplying the sector address supplied from the external device by the number of segments per sector to obtain the initial total number of segments, and the number of segments per track common to all tracks ,
The second step of multiplying the power of 2 which is the closest value to the total number of segments on the disk-shaped recording medium as the initial comparison segment number, and the above initial comparison segment or new comparison segment number The third step of forming a new comparison segment number by at least ½, the initial total segment number, the new total segment number, the initial comparison segment number, and the new comparison segment number are sequentially compared. In the fourth step and the successive comparison performed in the fourth step, when the initial comparison segment number or the new comparison segment number becomes smaller than the initial total segment number or the new total segment number, the initial total segment number is decreased. From the number of segments or the new total number of segments, the number of initial comparison segments or new comparison The fifth step of subtracting the number of segments to form a new total segment number, and when the initial comparison segment number or the new comparison segment number is larger than the initial total segment number or the new total segment number 0, the initial comparison segment number or new comparison segment number,
A sixth step of storing and setting 1 in the storage means corresponding to at least a binary number when it is smaller than the initial total segment number or the new total segment number, and the third step to the sixth step , The value used as the binary number finally stored in the storage means is set as the track address by repeating the power number used in forming the comparison segment in the second step + 1 times, and Address detection method that uses a total number of total segments as the segment address. 2. The entire area of the disk-shaped recording medium is divided into a plurality of zones along the radial direction, and the external device continuously assigns sector addresses from the beginning of each zone. In the first step, the sector address of the zone supplied from the external device is multiplied by the number of segments per sector, which is different for each zone, and this is set as the initial total segment number. In the second step, the number of segments per track common to each zone is multiplied by the power of 2 which is the closest value to the number of segments in the zone having the largest number of segments. The address detecting method according to claim 1, wherein is set as the initial comparison segment number. 3. An address detecting device for detecting a segment address and a track address in a disk-shaped recording medium in which a sector address of a sector composed of a plurality of segments is not recorded, based on a sector address supplied from an external device. First sector means for multiplying the sector address supplied from the external device by the number of segments per sector and outputting this as the initial total number of segments, and a segment per track common to all tracks. Number and
Second multiplication means for multiplying the power of 2 which is the closest value to the total number of segments on the disk-shaped recording medium and outputting this as the initial comparison segment number, the initial comparison segment number and a new comparison Third multiplication means for gradually increasing the number of segments by at least 1/2, the initial total segment number and the initial comparison segment number, the initial total segment number and the new comparison segment number, or the new total segment number and the new comparison segment number. A comparison means for sequentially comparing the number of comparison segments and a subtraction process of the initial comparison segment number from the initial total segment number, a new comparison segment number from the initial total segment number, or a new total segment number Subtract the new number of comparison segments and compare this with the new total number of segments Stores a subtraction means for supplying stage, the value corresponding to the comparison result of the comparing means,
Based on the comparison output from at least the binary number-corresponding storage means and the comparison means, the size comparison among the initial comparison segment number, the new comparison segment number and the initial total segment number, and the new total segment number is detected, and the initial comparison is performed. If the number of segments or new comparison segment number becomes smaller than the initial total segment number or new total segment number, the initial comparison segment number or new comparison segment number is calculated from the initial total segment number or new total segment number. The subtraction means is controlled so as to perform the subtraction processing and supply this to the comparison means as the new total segment number, and the initial comparison segment number or the new comparison segment number is the initial total segment number or the new total segment number. Greater than number 0 if you are
Further, when the initial comparison segment number or the new comparison segment number is smaller than the initial total segment number or the new total segment number, the storage means is controlled so as to store 1, and in the comparison means,
At the time when the number of powers used to form the comparison segment plus one comparison operation are completed, the value finally indicated by the binary number stored in the storage means is used as the track address, and the final total is obtained. An address detection device having control means for detecting the number of segments as a segment address. 4. The entire area of the disk-shaped recording medium is divided into a plurality of zones along the radial direction, and the external device is continuously assigned sector address designations from the beginning of each zone. The first multiplication means multiplies the sector address of the zone supplied from the external device by the number of segments per sector which is different for each zone, and sets this as the initial total number of segments. The second multiplication means multiplies the number of segments per track common to each zone by the power of 2 which is the value closest to the number of segments in the zone having the largest number of segments among the zones. 4. The address detecting apparatus according to claim 3, wherein the number is the initial comparison segment number.