WO1996037891A1

WO1996037891A1 - Error check method of servo sector address, disk storage device and its controller

Info

Publication number: WO1996037891A1
Application number: PCT/JP1996/001388
Authority: WO
Inventors: Motoyasu Tsunoda; Shoichi Miyazawa; Hitoshi Ogawa; Kosuke Nakai; Masatoshi Nishina; Katsumi Yamamoto; Tadahiro Kawagishi
Original assignee: Hitachi, Ltd.
Priority date: 1995-05-25
Filing date: 1996-05-24
Publication date: 1996-11-28

Abstract

A disk storage device using a disk of an ID-free format system and its control method. In the disk of the ID-free format system, a servo sector address SSA (23) is stored in a servo sector (16). An address (SSA51) (23) is read out at the time of data access and it also serves to predict the address (NXTSSA71) (23) of a subsequent servo sector (16). The latest address (SSA51) and the address (NXTSSA71) predicted previously are compared on the subsequent servo sector (16). When they are coincident, read-out of the address (SSA51) is judged to be successful, and this address is used to determine the address of the succeeding data sector (17). The address of the data sector is determined by calculation. Only split time, split length and SPSO may be stored in a conversion table used for generating the data sector address (DSA), etc., from the servo sector address (SSA). The positional relationship between the servo sector and the data sector on the cylinder is such that the same pattern is repeated in each boundary. Therefore, the table is provided for only a predetermined boundary. Information (index) necessary for looking up to this table, too, is determined by the calculation using the servo sector address.

Description

Description Servo sector address correct / incorrect judgment method, disk type storage

Device and its control device

The present invention relates to a disk-type storage device compatible with a high-density recording method and a control device thereof, and more particularly, to a disk-type storage device that prevents deterioration of reliability and throughput in a high-efficiency format method by performing ID comparison multiplexing. The present invention relates to a storage device and a disk control device.

Background art

In recent years, as the functions and performance of personal computers and office computers have been improved, there has been a strong demand for data storage devices, especially magnetic disk devices, to have higher capacity and higher performance. Under these circumstances, attention has been paid to a method of increasing the storage capacity by improving the format efficiency.

One example of this approach is to eliminate the ID area provided for identifying sectors. Here, this system is defined as “ID-less format system”. The IDless format system is described in, for example, Japanese Patent Application Laid-Open No. 5-174498 (corresponding to US Patent Application Ser. No. 727 680 filed on July 10, 1999). I have. Hereinafter, the format configuration in the ID-less format system will be described with reference to FIG.

The disk format consists of a servo sector (SSCT 16) provided to control the position on the recording medium of the head that performs data recording and playback operations, and a data sector provided to store user data. (DSCT 17).

An example of the servo sector 16 is shown as SSCT example 1 in FIG.

83 (: Example 1 is AGCG (Auto Gain Control Gap) 18; S VMK (Servo Mark) 19; I DXM (Index Mark) 20 / S CTM (Sector Mark) 21; CY L 22; POS 25 , ISG 26. AGCG 18 is servo information This is an area provided for adjusting the read gain. The servo mark (SV MK) 19 is an area provided for detecting the head position of the servo sector. The index mark (IDM) 20 / sector mark (SCTM) 21 is an area provided to identify the head of a track or sector. If it is the beginning of the track, the index mark is 20. On the other hand, the sector mark 21 is written in other cases. CYL (Cylinder Address) 22 is an area for storing a cylinder number (track number). POS (Position Pattern) 25 is an area for storing detailed head positioning information between cylinders. The POS 25 is used to control a detailed head positioning operation (settling) and a follow-up operation (following) that always positions the head on the target cylinder. ISG (Inter Sector Gap) 26 is an area provided to absorb rotational fluctuations of the disk.

In this way, the servo sector SS CT 16 is used to move (seek), settle and follow the head to the target cylinder, so that the servo sector SS CT 16 can always be read by the head. There is a need to. The servo sectors SSCT 16 are arranged at regular intervals over all the cylinders on the disk and so that there is no displacement of the servo sectors between the cylinders, that is, at regular intervals in a fan shape on the magnetic disk. General. This means that the servo sector S SCT 16 can be read at the same timing regardless of the cylinder position of the head, and the time for the head to pass through the servo sector SS CT 16 is constant. This is to ensure that

On the other hand, the data sector 17 includes the case where the recording density is constant over the inner and outer circumferences of the disk, the case where the servo sector is included in the format (DSCTB 17-), and the case where If not (DSCTA 17–1), the configuration is different for (see Fig. 2). Note that DSCTB may be referred to as "split data sector".

DSCTA 17-Ui, ISG26, PLO (PLO pattern) 27, BS (Byte Sync Pattern) 28, DATA (User Data) 29, ECC (Error correcting Code) 30, and PAD 31. ISG 26 is designed to reduce disk rotation fluctuations. This is a region provided for absorption. PL027 is an area provided for synchronizing clocks with read data. BS 28 is an area provided to indicate the timing of converting serial data into parallel data. D ATA29 is an area for storing user data. The ECC 30 is an area for storing a check as to whether there is an error in the read data 29 and, when an error is found as a result of the check, information necessary for correcting the error.

DSCTB 17-2 is basically a format in which SSCT 1612 is inserted into DSCTA. However, PL027 and BS28 are arranged again after SSCT 16-2. This means that when reading, when the head passes through SSCT 16-2, the read processing is interrupted once, so the clock synchronization and byte synchronization must be performed again to perform the read processing again. That's why.

When such an ID-less format method is used, the detection of the data sector 17 requested by the host computer is performed as follows. Here, it is assumed that the servo sector has the configuration of Example 1 of SCT in FIG.

Since the data sector 17 has no ID section storing the data sector address (DSA), the data sector address is obtained using the sector address (SSA) 23 of the servo sector 16. (SSA stands for Servo Sector Address.) In other words, the address of servo sector 16 including index mark (I DXM) 20 is set to 0. Then, each time the sector 1 mark 21 of the subsequent servo sector 16 is detected, the servo sector address is incremented by one. In this way, by counting the sector one mark 21 in order, the sector address can be confirmed, and the target servo sector 16 can be reached. After this, the data sector address (DSA) can be obtained using the address translation table. Japanese Patent Application Laid-Open No. Hei 6-131856 also discloses a similar concept of an ID-less format.

Disclosure of the invention

In the IDless format method, in order to detect the address of the data sector 17, the index mark (I DXM) 20 and the sector mark (SCTM) 21 stored in the servo sector 16 are used. And SVMK 19 must all be detected correctly. While accessing data, any of these 1 If any error is detected (or detection is impossible (missing)), the above-mentioned servo sector address (SSA) cannot be obtained correctly. This could destroy user data or transfer incorrect data to the host computer. In order to solve such a problem, a method using a data format in which SSA23 is stored in the servo sector 16 has been proposed (see SSCT example 2 in FIG. 2). In this method, the servo sector address can be confirmed by directly reading SSA23 in servo sector 16 where the head is actually located. However, even with this method, if an error occurs in reading the SSA 23, the same malfunction as described above occurs.

Further, the above prior art discloses a method of adding an error detection code (CRC) 24 to a servo address including SSA23 and checking whether the read CYL 22 or SSA23 is erroneous. ing. (CRC stands for Cyclic Redundancy Code.) However, if an error that cannot be detected by CRC 24 occurs, a malfunction occurs.

Another problem will be described with reference to the above-described related art.

As described above, if the servo sector address (SSA23) is obtained, the data sector address (DSA) corresponding to the servo sector address (SSA23) can be obtained using the address conversion table. The address conversion table stores the address of the data sector, the length of one data sector (split time), etc., located after the servo sector.

This address conversion table can be uniquely created at the time of formatting in units of tracks. In this address conversion table, it is necessary to prepare information for the number of servo sectors 16 included in at least one track (cylinder) (that is, information for one track round).

As described above, in the conventional IDless format system, the number of address conversion tables used for obtaining the data sector address (DSA) from the servo sector address (SSA) is required by the number of servo sectors per track. For example, consider an address translation table where the number of servo sectors per track is 64 and the number of data sectors per track is 256 (8 bits). This address The data conversion table has a data amount of 64 × 8 = 512 bits. In order to increase the versatility of the address conversion table, the address conversion table should have at least 128 servo sectors per track and 5 1 2 (9 bits) data sectors per track. ) It is necessary to prepare. In other words, this address conversion table has a data amount of 128 × 9 = 1115 bits. However, such a large-capacity (1 152 b) address conversion table was too large to be built into an IC.

In the ID-less format, if the format has an ID section, a clear sector (eg, split information) for accessing a data sector contained in the ID section is also included in the servo sector address. (SSA). It is conceivable to store the address conversion table in a data buffer for temporarily storing data read from the storage medium, but this has a problem that the circuit configuration becomes complicated. In other words, the data buffer is provided mainly for temporarily storing data to be read / written from / to the RZW head and data to be read / written from the host computer. In addition, since there is a data sector that starts immediately after the servo sector in the ID response format, the data sector address must be generated after reading the servo sector address and before ending the servo sector. Therefore, in order to store the address conversion table in this data buffer, an interface circuit for inputting and outputting data between the arbitration circuit for accessing the address conversion table and the buffer control unit is required. However, it had to be added to the data buffer arbitration circuit.

An object of the present invention is to provide a highly reliable disk-type storage device that prevents erroneous detection of a servo sector address, destruction of user data due to non-detection (missing), and transfer of erroneous data. It is to provide the control device.

It is another object of the present invention to provide a method for determining correct / incorrect of a sector address.

In order to achieve the above object, the present invention has, as a first mode, a data sector and a servo sector, and at least an address of the servo sector (hereinafter, “servo sector address”) is included in the servo sector. Reads desired data from disk-type storage medium formatted in written format to Z A disk-type storage device that performs at least one of read and write operations, comprising: reading means for reading a servo sector address from a servo sector and reading data from a data sector; and a servo sector address read by the reading means. Predicting means for predicting the servo sector address of the following servo sector based on the information, reading means, the servo sector address read out strongly, and the servo sector address read out by the reading means immediately before. Is compared with the servo sector address predicted by the prediction means on the basis of the above, and when the comparison result shows that the two coincide, the read power of the servo sector address by the reading means << If the determination means determines that the servo sector address has been read correctly, And a data sector address generating means for obtaining an address of a data sector arranged following the servo sector located at the servo sector address. The reading means can read data from the data sector at the address determined by the data sector address generating means overnight. In this case, in the case where the servo sector address is assigned by a method of adding a predetermined value to the address of the immediately preceding servo sector, the prediction by the predicting means is performed by the reading means read out immediately before by the reading means. It may be performed by adding the above-mentioned predetermined value to the vosector address.

According to a second aspect of the present invention, a disk-type storage medium that includes a data sector and a servo sector and is formatted in a format in which at least the servo sector address of the servo sector is written in the servo sector is a disk sector. A disk-type storage device that performs at least one of reading and writing of desired data, wherein reading means for reading a servo sector address from a servo sector and reading data from a data sector; and reading means. The arithmetic means for performing a predetermined operation predetermined for the read servo sector address according to the servo sector address allocation method, the servo sector address read by the read means, and the read means immediately before Calculation based on servo sector address The step compares the result of the predetermined operation with the result of the comparison. If the result of the comparison indicates that the two have a predetermined relationship, it is determined that the reading of the servo sector address by the reading means has been correctly performed. Determining means for determining, servo sector And a data sector address generating means for determining an address of a data sector located after the servo sector located in the servo sector address when the determination means determines that the address has been read correctly. Disk type storage device is provided. The reading means may read data from the data sector at the address determined by the data sector address generating means.

In this case, in the case where the allocation of the servo sector address is performed by a method of adding a predetermined value to the address of the immediately preceding servo sector, the arithmetic operation by the arithmetic unit is performed by the read unit immediately before. The predetermined value may be added to the servo sector address.

According to a third aspect of the present invention, there is provided a disk-type storage medium which is provided with a data sector and a servo sector and is formatted in a format in which at least a servo sector address of the servo sector is written in the servo sector. A disk-type storage device for reading a desired data, comprising: reading means for reading a servo sector address from a servo sector and reading data from a data sector; and a plurality of data sectors and a plurality of servo sectors. A counting means for resetting the count value upon detecting the start mark of the constructed track, and incrementing the count value by a predetermined value each time a servo sector is detected; The read servo sector address, the count value of the counting means, The comparison means determines that the reading of the servo sector address has been correctly performed by the reading means if the two have a predetermined relationship as a result of the comparison, and the reading of the servo sector address has been performed correctly. If the determination means determines that the data has been read, a disk-type storage device comprising: a data sector address generation means for obtaining an address of a data sector arranged following the servo sector; The reading means may read data from the data sector at the address determined by the data sector address generating means. In each of the above aspects, there is provided second determination means for determining whether or not the address obtained by the data sector address generation means and the address of the data sector to be accessed at that time match, and the reading means comprises: If the two match as a result of the determination by the second determination means, the data sector located at the address is May be read.

In each of the above aspects, the writing means for writing the data separately instructed to be written into the data sector, and the address obtained by the data sector address generating means at the time of writing the data, the address of the data sector being accessed at that time. Second determining means for determining whether the data sector matches the address, and when the two determination results match, the writing means writes the data to the data sector. It may be.

In each of the above aspects, a data sector information table which describes information indicating a relationship between the servo sector address and a data sector address of a data section located immediately after the servo section of the servo sector address. The data sector address generating means may include a storage means for storing the data sector address, and obtain the data sector address by referring to the data sector information table.

According to a fourth aspect of the present invention, there is provided a disk-type storage medium that includes a data sector and a servo sector, and is formatted in a servo sector address format of at least the servo sector. A control device used in a disk-type storage device for reading and Z or writing desired data by using a head. Based on a servo sector address read by the head, a subsequent servo sector is used. The prediction means for estimating the sub-sector address of the head, the servo sector address read hard and the prediction means are compared with the previously predicted sub-sector address. Means for determining that the servo sector address is correct; and a controller for a disk storage device having: That.

According to a fifth aspect of the present invention, a disk-type storage medium that includes a data sector and a servo sector, and is formatted in a format in which at least the servo sector address of the servo sector is written in the servo sector, A control device used for a disk-type storage device that reads and Z or writes desired data using a head, and is composed of a plurality of data sectors and a plurality of servo sectors in a signal read by a head. Start mark of track to be detected The counting means resets the count value, and counts up the count value by a predetermined value each time the servo sector is detected, and read from the storage medium by the head. The servo sector address is compared with the count value of the counting means. If the comparison result shows that the two have a predetermined relationship, the servo sector address read from the storage medium by the head is correct. And a control unit for a disk storage device having:

According to a sixth aspect of the present invention, there is provided a method for judging whether a servo sector address read from a servo sector of a recording medium is correct or not, wherein a next sector sector is read based on a servo sector address read from a servo sector. The servo sector address is predicted, the predicted servo sector address is compared with the servo sector address read from the next servo sector, and if they match, the read servo address is determined. A method for judging whether a single sector address is correct or not is provided.

According to a seventh aspect of the present invention, there is provided a method for judging whether a servo sector address read from a servo sector of a recording medium is correct or not, wherein when a start mark of a track is detected, the count value is reset, and Each time a servo sector is detected, the count value is incremented by a predetermined value, and the servo sector address read from the servo sector is compared with the count value, and the result of the comparison is determined in advance. If there is a relationship, a correct / incorrect determination method of the servo sector address that determines that the servo sector address read at this time is correct is provided.

The operation of the first, second, fourth, and sixth aspects will be briefly described together. In the servo sector of the storage medium, the servo sector address of the servo sector is written. As such a data format, for example, an SSCP example 2 in FIG. 2 can be considered. However, CRC 24 for the address may not be provided.

When accessing data, the read means reads the servo sector address from the servo sector. The predicting means predicts a servo sector address of a subsequent servo sector based on the servo sector address read by the reading means. this is, For example, when the address of the servo sector including the index mark is set to 0 and the addresses of the servo sectors are assigned so that the addresses of the following servo sectors are added one by one, the prediction means has a simple increment function. Can be realized. Note that, in the second mode, the calculation by the calculation means plays an equivalent role.

The judging means comprises a servo sector address predicted by the predicting means based on the servo sector address read by the reading means and the servo sector address read immediately before by the reading means (or , And the calculation result by the calculation means) and. As a result of the comparison, if they match (or if they have a predetermined relationship), it is determined that the reading of the servo sector address by the reading means has been performed correctly.

If the determining means determines that the reading power of the servo sector address has been correctly performed, the data sector address generating means obtains the address (data sector address) of the data sector located after the servo sector from the servo sector address. . This can be done, for example, by referring to a data sector information table describing the relationship between the address of the data sector and the servo sector address.

The second determining means determines whether or not the address obtained by the data sector address generating means matches the address of the data sector to be accessed at that time. As a result of the determination, if they match, the reading means reads the data from the data sector or the writing means writes the data.

The operation of the third, fifth, and seventh aspects will be briefly described collectively.

The reading means reads a servo sector address from the servo sector.

In parallel with this, the counting means counts up the count value by a predetermined value each time a servo sector is detected, triggered by the detection of the servo sector containing the start mark of the track. . If the servo sector address assignment power of the servo sector and the index of the servo sector including the index mark are set to 0 and the address of the subsequent servo sector is incremented by one, the counting means is: Count up one by one. Here, the example of counting up is described, but the same is true for counting down.

The determination means compares the read servo sector address with the count value by the counting means. As a result of the comparison, if they match, the judging means judges that the reading of the servo sector address by the reading means has been performed correctly.

At "

If it is determined that the servo sector address has been read correctly, the data sector address generation means obtains the address of the data sector located after the servo sector from the servo sector address. This can be done, for example, by referring to a data sector information table describing the relationship between the servo sector address and the data sector address.

The second determining means determines whether or not the address obtained by the data sector address generating means matches the address of the data sector to be accessed at that time. As a result of the determination, if they match, the data is read from the data sector by the reading means or the data is written by the writing means, and {τ}.

Still another object of the present invention is to provide a storage device having a reduced circuit scale by suppressing the capacity of a table storing information that needs to be prepared in advance for control, and a control device therefor.

According to the present invention, a data sector address and the like are calculated from a servo sector address by utilizing the periodicity of an array of servo sectors and data sectors on a cylinder (sector array).

Also, this periodicity is used to reduce the amount of information in the table. In other words, the table has only one cycle.

In order to achieve the still another object of the present invention, as an eighth aspect of the present invention, there is provided a servo sector in which at least its own address is stored, and a data sector for storing data. A control device used for a storage device that reads information from a storage medium formed by a predetermined rooster train (hereinafter referred to as "sector rooster train"). Indicates the number of data sectors contained in And information indicating the number of sub-sectors included in a predetermined range in the sector list, and using the sub-sector address of the sub-sector read out separately, the following equation (1) ) And rounding up the result to the nearest decimal point, the address of the first data sector starting from the servo sector indicated by the servo sector address used in the calculation of the formula (hereinafter referred to as “data sector address”) And a control device for a storage device, comprising:

SSA-DSPB / SSPB (1)

However, SSA: servo sector address

DSPB: Number of data sectors included in a predetermined range in the sector array

SSPB: Number of servo sectors included in a predetermined range in the sector array

The sector array allows the servo sector to be located so as to divide the data sector at an intermediate position in the data sector, and calculates the following equation (2) using the servo sector address read separately. By rounding down the decimal places of the calculation result, the address of the data sector divided by the servo sector next to the servo sector indicated by the servo sector address used in the calculation of equation (2) in the sector array May be provided.

(SSA + 1)-DS PB / S S PB (2)

However, the definitions of SSA, DSPB and SSPB are the same as those described above. According to a ninth aspect of the present invention, at least a servo sector storing its own address and a data sector for storing data are stored in a storage medium formed in a predetermined sector array. This sector arrangement allows the servo sector to be located so as to divide the data sector at an intermediate position of the data sector, and It contains information indicating the number of data sectors included in a predetermined range on the rookie train and information indicating the number of servo sectors included in a predetermined range on the sector array. The same operation as the above equation (2) is performed using the servo sector address of the above servo sector, and the result of the calculation is rounded off to the decimal point By discarding, the control of the storage device having the calculating means for obtaining the address of the data sector divided by the servo sector next to the servo sector indicated by the servo sector address used in the calculation of the mathematical formula in the sector array An apparatus is provided.

In the eighth and ninth aspects described above, a table is stored in which data sector information prepared for each servo sector is associated with an index indicating the position of the servo sector in a predetermined range. Storing means, a further calculating means for obtaining an index based on the servo sector address, and data sector information corresponding to the index obtained by the further calculating means are obtained from the table, and the obtained data sector is obtained. Control signal generation means for generating and outputting a control signal according to the information.

Further calculation means may be for obtaining the above-mentioned index as a remainder obtained by dividing SS A by SS P B.

The sector arrangement is a repetition of a specific arrangement pattern, and the predetermined range is the specific arrangement pattern, and the table includes an index and corresponding data sector information and power. It is preferable that only one area is stored.

Prediction means for predicting the next servo sector address, wherein the calculation means and / or the second calculation means perform corresponding calculations using the servo sector addresses predicted by the prediction means. Is also good.

According to a tenth aspect of the present invention, at least a servo sector storing its own address and a data sector for storing data read information from a storage medium formed in a predetermined arrangement. There is provided a storage device, comprising: a reading unit that reads information stored in the storage medium; and a control device according to the first and second aspects.

It is preferable to further comprise writing means for writing data to the storage medium. The operation of the eighth, ninth, and tenth modes will be briefly described.

The arithmetic means uses the number of data sectors (DSPB) and the number of servo sectors (SSPB), which are included in a predetermined range in the sector arrangement, and the servo sector address read separately, as described above. The calculation of the equation (1) is performed. Soshi Then, by rounding up the decimal part of the operation result, the address power of the first data sector starting after the sub-sector indicated by the sub-sector address used in the operation is obtained in the sector array.

Further, the second calculation means performs the calculation of the above-described equation (2) by using the DSPB, the SSPB, and the separately read servo sector address. Then, by truncating the decimal part of the operation result, the address of the data sector divided by the servo sector next to the servo sector indicated by the servo sector address used in the operation is obtained in the sector arrangement.

It should be noted that the servo sector address used in performing such an operation does not necessarily need to be read from a storage medium. If a means for predicting a servo sector address is provided, the prediction result may be used.

The above-mentioned further calculating means obtains data sector information prepared for each servo sector by referring to the table based on the index. This index is S

It is calculated as the remainder of S A divided by S S P B. The control signal generation means obtains data sector information corresponding to the obtained index from the table, and generates and outputs a control signal according to the obtained data sector information.

In the case where a specific arrangement pattern is repeated, the specific arrangement turn is set to the predetermined range described above. In this way, when obtaining data sector information, the same table can be reused for each of a predetermined range (specific arrangement pattern). In other words, it suffices to prepare only one table for this predetermined range (in this case, the specific arrangement pattern).

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing the configuration of the servo control unit 8 according to the first embodiment of the present invention.

FIG. 2 is a diagram showing an example of a disk format configuration employing the ID-less format method.

FIG. 3 is a block diagram showing a system configuration of the disk device according to the first embodiment of the present invention. FIG. 4 is a block diagram C showing the structure of the next-sector sector address prediction circuit 40.

FIG. 5 is a diagram showing the SSA comparison timing.

FIG. 6 is a flowchart showing the SSA comparison processing.

FIG. 7 is a block diagram showing the configuration of the drive interface control unit 9. FIG. 8 is a block diagram showing the configuration of the servo control unit 8 'according to the second embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of the servo sector address counter circuit 78.

FIG. 10 is a diagram showing the SSA comparison timing.

FIG. 11 is a block diagram showing a configuration of a servo control unit 8 in the third embodiment of the present invention.

FIG. 12 is a diagram showing a positional relationship between a servo sector and a data sector.

FIG. 13 is a block diagram showing the configuration of a data sector address generation circuit 46 'and peripheral circuits in the third embodiment.

FIG. 14 is a diagram showing the operation timing of the circuit of FIG.

FIG. 15 is a block diagram showing the configuration of the data sector generation circuit 46 # and peripheral circuits in the fourth embodiment of the present invention.

FIG. 16 is a diagram showing the operation timing of the circuit of FIG.

FIG. 17 is a block diagram showing the configuration of a servo control unit 8 "'in the fifth embodiment of the present invention provided with a next SSA prediction circuit.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that similar members are denoted by similar numbers throughout the drawings.

A first embodiment of the present invention will be described with reference to the drawings.

This embodiment assumes a data format in which a servo sector (SSCT) is strongly included in a servo sector address (SSA). The following description is based on the assumption that the data format of the servo sector is as shown in SSCT example 2 in FIG. However, as Gray code, Head address (HD) It also includes 50 (Figure 5). Conversely, when applying this data format to the present embodiment, the CRC 24 may not be provided. FIG. 5 shows a part of the data format of the present embodiment. FIG. 3 is a block diagram showing the system configuration of the disk device 1 employing the data surface servo method. The disk device 1 includes a data processing device 2, a signal processing device 3, a motor driver 5, an RZW amplifier 4, an R / W head 6, and a data surface recording medium 7. The data processor 2 further comprises a CPU 11, host interface controller 14, buffer controller 12, drive interface controller 9, servo controller 8, ECC controller 10, and data buffer 13. Is done.

Hereinafter, an outline of the operation of each of the above blocks will be described by taking a reproduction operation as an example.

The CPU 11 calculates the address on the recording medium where the data requested by the host computer 15 is stored. Then, this is notified to the servo control unit 8.

The servo controller 8 detects CYL 22 and SSA 23 from the signal read from the self-recording medium 7 by the R / W amplifier 4, the signal processing device 3, etc., and obtains a data sector address (DSA). . Then, the data interface address (DSA) is notified to the drive interface control unit 9. Also, it detects P0S25 and outputs a control signal to the motor driver 5 to settle and follow the RZW head 6 on the cylinder where the requested sector exists.

The motor driver 5 controls the voice coil motor (VCM) and the spindle motor based on the control signal. As a result, the RZW head 6 is moved to the target position.

The R / W amplifier 4 amplifies the signal read by the RZW head 6 and outputs the amplified signal to the signal processing device 3.

The signal processing device 3 synchronizes with the read data input from the RZW amplifier 4 based on the PLO 27. Furthermore, after discriminating the read data into a clock and NRZ data, these are transferred to the drive interface control unit 9. The above RZW amplifier 4, RZW head 6, signal processing device 3, etc. correspond to "reading means" and "writing means" in the scope of the request. is there.

The drive interface control unit 9 determines whether the data sector address (DSA) notified from the servo control unit 8 is the target address at that time. If it is the target address, the data 29 is converted from serial data to parallel data based on the BS 28 and transferred to the buffer control unit 12. At the same time, the converted parallel data is also transferred to the ECC controller 10. The drive interface control unit 9 (especially, an IDZD ATA comparator 62 described later) corresponds to the "second determination means" in the claims.

The ECC control unit 10 performs error correction of the DATA 29 using the ECC 30 in the read data. Thereafter, the buffer controller 12 transfers the data 29 to the host computer 15 via the data buffer 13 and further via the host interface controller 14. In this case, if an error is found by the ECC control unit 10, the DAT A 29 after error correction by the ECC control unit 10 is transferred.

This concludes the description of the reproducing operation. Note that the data recording operation is not described here because the data is transferred along a path substantially opposite to the reproduction operation.

Next, the servo control unit 8 and the drive interface control unit 9, which are the main components of the present invention, will be described in more detail.

FIG. 1 is a block diagram showing a configuration of the servo control unit 8.

The servo controller 8 receives a read data pulse (RDP) 48 from the signal processor 3. On the other hand, the servo controller 8 outputs a data sector address (DSA) 57 and various control signals to the signal processor 3 and the drive interface controller 9.

The servo control sequencer 32 is not shown for the sake of clarity of the drawing, but is connected to the components constituting the servo control unit 8 and controls the output timing of control signals generated and output by these components. are doing. Various flags, variables, and the like necessary for the control are provided inside. Further, the servo sequencer 32 outputs "End of Servo" 53 to the drive I / F control unit shown in FIG. This is the This is a control line for notifying the control unit 9 that the processing of the servo sector 16 has been completed.

The servo clock generation circuit 33 generates a clock having a frequency necessary for the operation of the servo control unit 8 itself, such as an external clock (source clock) 52 such as a transmitter.

The RDP detection circuit 34 synchronizes the read data pulse (RDP) 48 input from the signal processing device 3 with the servo clock input from the servo clock generation circuit 33, and performs various subsequent circuits 35, 36 , 37, 38.

The servo mark detection circuit 36 detects the RDP 48 force synchronized with the servo clock, and SVMK 19 (see No. 2). Similarly, from the RDP 48 synchronized to the servo clock, the index mark detection circuit 37 detects I DXM20 and the sector mark detection circuit 38 detects SCTM21 (see Fig. 2). .

The Gray code converter 35 converts the Gray code (see Fig. 2, Example 2 of SSCT) into a binary code. This gray code consists of a cylinder address (CYL) 22, a servo sector address (SSA) 23, and a head address (HD) 50 (see Fig. 5).

The current servo address latch 39 temporarily stores these addresses (CYL, HD, SSA) converted into binary codes. The servo address register 42 stores the address to be accessed at that time. Comparator 1 (41) determines whether the read address is the address to be accessed by comparing the addresses stored in current servo address latch 39 and servo address register 42 with each other. I do.

The cylinder address (CYL) 22 read from the current servo address latch 39 is also transferred to the CPU 11 in order to recognize the position of the RZW head 6 on the medium 7.

On the other hand, the next servo sector address (SSA) prediction circuit 40 reads the servo sector address (SSA) 23 from the current servo address latch 39. Then, the servo sector address (SSA) 23 to be detected next is predicted from the read servo sector address (SSA) 23. In addition, the “next-subsector address prediction circuit 40,” “prediction means” in the claims, This corresponds to "calculation means".

The prediction is performed by incrementing the read servo sector address (SSA) 23 by one. The value obtained by the increment is referred to as a predicted value (N XTS SA) 71. However, this is because the assignment of the servo sector address (SSA) 23 is such that the servo sector 16 including the index mark 20 is used as a reference (0), and the address of the subsequent servo sector 16 is incremented by one. It is assumed that Needless to say, the prediction method needs to be changed as appropriate according to the method of assigning the servo sector addresses 23.

An example of the next servo sector address (SSA) prediction circuit 40 is shown in FIG. As described above, the next sub-sector address (SSA) prediction circuit 40 of the present embodiment includes a flip-flop (FF) 66, an incrementer (INC) 67, a comparator 69, and a maximum SSA register (Ma X SSA Reg) 70 and selector 100.

The flip-flop 66 of the next SSA prediction circuit 40 asserts (enables) SADRINC73, takes in the read SSA, and generates and outputs NXTSSA71. In the maximum SSA register 70, the maximum SSA (the last number on the track, for example, n) is set in advance. As a result of the SSA comparison in the n_l-th servo sector, when the read SSA and the NXTS S71 match, the value of the NXT SSA71 is updated to “n” by the input of the SADRIC73. At this time, the comparator 69 outputs MSSAEQ75, and predicts that SSA will be the maximum value in the next servo sector. When the read SSA and the NXTS SA71 match as a result of the SSA comparison in the nth servo sector, the next SSA prediction circuit 40 asserts SARST 74 instead of SADRINC73. At the same time, the subsequent SSA, that is, "0" is compared. In this case, the selector 100 switches the output source of the NXTS S A 71 from the latter stage of the incrementer 67 to the former stage (0 output of?).

The various abbreviations used in connection with FIG. 4 are as follows.

NXTS S A71: Next servo sector address (to "CMP")

SSAI NC 73: Servo sector address increment signal (from Servo CNTL SEQ)

SARST74: Servo sector address reset siganal (from Servo

CNTL SEQ)

MS S AEQ 75: Max servo sector address equal signal (to Servo

CNTL SEQ)

The comparator 2 (43) shown in FIG. 1 compares the read SSA 23 with the NXTSSA71 obtained by the prediction based on the previously read SSA23, and checks whether there is any error in the read SSA23. I do. The comparator 2 (43) corresponds to "determination means" in the claims.

The timing of this comparison will be described with reference to FIG. In order to latch the read SSA23 (5 1), the sequencer 32 shown in FIG. 1 outputs SSALTEN77. In addition, the SSAMPEN76 is output and the comparison between SSA23 and NXTSSA71 read out is enabled.If the comparison shows that both match, the next sector is prepared for the next comparison. Predict the servo sector address (SSA) 23 to be read. That is, the SSANC 73 is output, and the servo sector address (SSA) 23 is incremented. However, if the value of the servo sector address (SSA) 23 before the increment is equal to the value of the maximum SSA register 70 (that is, when MS S AEQ 75 in FIG. 4 is active), The next predicted servo sector 16 is the servo sector 16 including the index mark 20. Therefore, in this case, SSARST74 is output to reset NXTS SA71.

The various abbreviations used in Fig. 5 are as follows.

S S A 51: Servo sector address

N X T SSA 71: Next servo sector address

SSA CMP EN 76: Servo sector address compare enable

S S ALTEN 77: Servo sector address latch enable

SSA I NC 73: Servo sector address increment signal

S S AR S T 74: Servo sector address reset signal

MSSAEQ75: Max servo sector address equal signal The above-mentioned SSA comparison operation will be described again with reference to FIG. In the example of this figure, the flag for judging comparison is used, and if the comparison result in the previous servo sector does not match, SSA comparison is not performed and access to the subsequent data sector is prohibited. It has become.

After the start of the processing, the servo control sequencer 32 sets the internal comparison flag to 0 in order to prevent the comparison of the SSA in the first servo sector to be accessed (step 602). Subsequently, the current servo address latch 39 latches the SSA of the Mth servo sector according to the instruction from the servo control sequencer 32 (step 604). M is a variable internally provided in the servo control sequencer 32 for specifying a servo sector to be processed. When this latch is completed, the servo control sequencer 32 determines whether or not the comparison flag is 1 (step 606). If the result of this determination is that the comparison flag is 1, the flow proceeds to step 612. On the other hand, if it is not 1, the process proceeds to step 608. Since the comparison flag is set to 0 in step 602 described above, if step 606 is executed immediately after the start of the processing in FIG. Become. -In step 608, the next SSA prediction circuit 40 generates NXTSSA by adding 1 to SSA (RDSSA) read in step 604 in accordance with an instruction from the servo control sequencer 32. In the following step 61, the servo control sequencer 32 sets 1 to the comparison enable flag. Thereafter, the servo control sequencer 32 judges whether or not to terminate the access processing by judging the contents of the instruction from the CPU 11 (step 620). As a result, if the operation has not been completed yet, the servo control sequencer 32 increments M to move the next servo sector to be accessed (step 62 2). Then, the process returns to step 604, and the same processing is repeated.

By the way, if the comparison permission flag is 1 in step 606, the comparator 2 (43) compares the RDSSA and the NXTSSA to determine whether or not they are the same ( Step 6 1 2). As a result, if they match, the servo control sequencer 32 returns to the data sector after the servo sector. An instruction to permit access is output to the drive I ZF control unit 9 (step 614). Thereafter, the processing moves to steps 608 and 610. If they do not match in step 612, the servo control sequencer 32 outputs an instruction to prohibit access to the subsequent data sector to the drive IZF control unit 9 (step 616). Then, the comparison enable flag is set to 0 so that the SSA comparison is not performed in the subsequent servo sector (step 618). Thereafter, the process proceeds to step 620 to repeat the same processing.

As described above, in this embodiment, if the servo mark 19 and the sector mark 21 can be correctly detected from the previous servo sector 16, the servo sector 16 which is the target at that time can be used. It is possible to determine whether the servo sector address (SSA) 23 has been correctly detected.

As shown in Fig. 5, even if a sub-sample 19 other than the above-mentioned target is not detected, the comparison result can be ignored. There is no bottom.

The SSA 23 determined to be correctly detected by the above comparison is transferred from the current servo address latch 39 to the data sector information table 44 (see FIG. 1).

The data sector information table 44 contains the address (DSA) 57 of the data sector 17 following the servo sector 16 corresponding to each SSA 23, and the sector pulse (SCTP) 58 indicating the start position of the next data sector 17 And the start position of the next servo sector 16 are stored. These pieces of information are information unique to each recording medium, are stored in a ROM (or a recording medium), and are transferred to the servo control unit 8 as needed. The table 44 may be provided in the data buffer 13 shown in FIG. In a device in which the recording medium can be replaced, the table information may be stored on the recording medium and read when the system is started.

The generation circuit 45 generates a sector pulse (SCTP) 58 at the SCTP generation position indicated in the data sector information table 44 and outputs it to the drive interface control unit 9. The index pulse (I DXP) 59 Is generated and output to the drive I ZF control unit 9.

The data sector address generation circuit 46 outputs the DSA 57 indicated by the data sector information table 44 to the drive I / F control unit 9. The DSA 57 is incremented in response to the input of the SCTP 58. The data sector address generating circuit corresponds to "data sector address generating means" in the claims.

The split length generation circuit 47 stores the position information (SPTL) 56 for temporarily suspending data processing in the data sector 17 located immediately before the subsequent servo sector 16 to the drive IZF control unit 9. Output to

Next, details of the drive IZF control unit 9 will be described with reference to FIG.

The read / write sequencer 60 starts operating when the IDXP 59 and the SCTP 58 are input from the servo control unit 8. Then, processing for the data sector 17 and operation timing control of each circuit in the drive IZF control unit 9 are performed.

The ID / DATA comparator 62 compares the data sector address (DSA) 57 read from the data sector information table 44 with the DSA 57 requested from the host computer 15.

As a result, if they match, the data transfer unit 64 transfers the data from the signal processing device 3 to the buffer control unit 12 at the time of the data read request. In addition, at the time of a data write request, the data is transferred from the buffer control unit 12 to the signal processing device 3.

The field counter 61 counts each field of the data sector 17 (see FIG. 2) according to the instruction of the read / write sequencer 60.

In addition, the processing interruption circuit 63 includes a split length (SP TL) 56 and an end of servo (ENDS) for temporarily suspending data processing on the servo sector 16 arranged in the middle of the data sector 17. A split enable (SP TEN) 65, which is a processing interruption instruction signal, is generated from 53 and is notified to each circuit.

In the embodiment described above, the servo mark 19 (or the index mark 20) and the sector mark 2 1 read from the servo sector 16 immediately before the servo sector to be accessed (hereinafter referred to as “target servo sector”) On the basis of the, The servo sector address of the target servo sector 16 is predicted. Then, by comparing the predicted value with the servo sector address actually read from the target servo sector 16, the correctness of the read servo sector address is confirmed. Therefore, highly reliable servo address detection can be realized, and destruction of user data and transfer of erroneous data can be prevented.

The prediction circuit 40 of the present embodiment adds 1 to the read servo sector address in accordance with the method of allocating the servo sector address. However, the prediction circuit 40 may add other numerical values or the like. In such a case, the prediction result does not match the servo sector address read thereafter. However, even in such a case, there is a certain relationship between the two. For example, if the prediction circuit 40 is configured to add 2 to the read servo sector address, the prediction result should always be one greater than the subsequently read servo sector address. is there. Therefore, by comparing the two, if such a relationship is established, it can be determined that the servo sector address has been correctly read.

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

In the second embodiment, every time the presence of a servo sector is detected, the counter is incremented by a predetermined value, and the servo sector address (SSA) included in the servo sector is read. Then, the correctness of the read servo sector address is confirmed by comparing the servo sector address read at that time with the count value up to that time.

The basic device configuration of the second embodiment is the same as that of the first embodiment (see FIG. 1). However, with the adoption of the method described above, instead of the next SSA prediction circuit 40 (FIG. 4) in the first embodiment, an SSA counter circuit corresponding to the counting means in the claims is used. Is provided in the servo control unit 8 '(see Fig. 8). Here, as in the first embodiment, description will be made on the assumption that the disk format shown in FIG. 2 is used.

The SSA counter circuit 78 counts up by a predetermined value (in this case, one by one) each time the servo sector 16 is detected. The servo sector address count (SS ACNT) 85 indicating the servo sector address is generated. That is, the SSA counter circuit 78 is a counter that sets the address of the servo sector 16 including the index mark 20 to 0, and counts up one by one each time a subsequent servo sector 16 is detected. However, this means that the servo sector address 23 is assigned one by one using the servo sector 16 including the index mark 20 as a reference (0) and the address of the subsequent servo sector 16. It is assumed. If the assignment of the address is different, the counting method is changed accordingly. Alternatively, a predetermined operation may be performed on the count value. For example, if the address value is incremented by two, the counter circuit 78 counts up by two each time a servo sector is detected. Alternatively, the count value may be incremented by one each time a servo sector is detected, and thereafter, the count value may be doubled.

In this embodiment, as shown in FIG. 9, the SSA counter circuit 78 is composed of a flip-flop (FF) 79, an incrementer (INC) 80, a comparator 81, and a maximum SSA register (Max SSA Reg) 82. Make up. The SSA counter circuit 78 resets by detecting an index mark (I DXM) and increments by detecting a sector mark (SCTM).

In FIG. 8, the comparator 2 (43) compares the SSA 23 read at that time with the servo sector address count SS ACNT 85 described above to determine whether the read SSA 23 has an error. Check. In other words, if they match, no error has occurred. Conversely, if the two do not match, an error (a read error in SSA23 or a detection error in servo sector 16) has occurred.

FIG. 10 shows a timing example of this comparison. I DXMF 84 in the figure is an instruction signal for resetting the SSA CNT 85. This I DXMF 84 is generated by the index mark detection circuit 37 and input to the SSA counter circuit 78. SCTMF 83 is an instruction signal for incrementing SS ACNT 85. The SCTMF 83 is generated by the sector mark detection circuit 38 and input to the SSA counter circuit 78. In the second embodiment, the servo sector 16 including the index mark 20, the servo sector 16 up to the target servo sector 16, and the servo mask 19, the index mark 20 And all sector marks 21 must be detected correctly. For example, consider the case where the target servo sector 16 is n, n + 1, as shown in FIG. If the detection of the sub mark 19 or sector mark 21 before the target servo sector 16 (SSA = 2 in the figure) fails, the value of SSA CNT85 will be the wrong value at that time. Becomes Then, the fact that a detection error has occurred is immediately clarified by comparing SSA 23 and S ACNT 85 at that time, and the comparison judgment in the target servo sector 16 does not match. Thus, embodiments of the second, the detection determination condition mono ball sector address severe, more detection of reliable mono Bosekutadoresu 23 can fi ¹ Ukoto.

The various abbreviations used in FIGS. 9 and 10 are as follows.

SSACNT85: Servo sector address count value

SSACMPEN76: Servo sector address compare enable

S S ALTEN 77: Servo sector address latch enable

S VMKF 86: Servo mark found

I DXMF 84: Index mark found

S C TMF 83: Sector mark found

MSSAEQ75: Max servo sector address equal signaKto Servo

CNTL SEQ)

As described above, according to the above-described embodiment, when performing data processing on a disk format employing the IDless format method, the user may be erroneously detected in the servo sector address 23 or may not be detected (missing). Data corruption and erroneous data transfer can be prevented, and the reliability of devices and systems can be improved. A third embodiment of the present invention will be described with reference to FIG. 11, and FIGS. 3 and 2 used in the description of the first and second embodiments.

In the third embodiment, a data sector address is obtained based on a servo sector address. The configuration of the prerequisite disk device is the same as that of Fig. 3. However, the servo control unit 8 is used instead of the servo control unit 8. First, an overview of the prerequisite disk device will be described with reference to FIG. The servo control unit 80 will be described later.

In order for the host computer 15 to perform READ / WR ITE of data to the disk device 1, first, a READZWR ITE instruction is issued to the disk device 1. This issuance is performed by writing an instruction to the register of the host I / F control unit 14. The instruction written to the register is interpreted and executed by the CPU 11.

If the instruction is a READ instruction, the CPU 11 issues an instruction to each block of the disk device 1 to execute the READ instruction. For example, the drive IZF control unit 9 sets a data sector address of data to be read.

Each unit operates as follows according to the instruction. -The servo control unit 8〃 operates the motor driver 5 to move the RZW head 6 to the cylinder address (CYL) 24 where the data to be read is recorded (seek operation). After the seek operation is completed, the RZW head 6 reads data from the data recording medium 7. The RZW amplifier 4 and the signal processing device 3 perform predetermined processing on the read data. The drive IZF control section 9 reads the processed data and causes the £ 〇〇 control section 10 to detect an error. £ (:(: The controller 10 performs error correction processing when an error occurs. The ECC controller 10 temporarily stores the corrected data in the data buffer 13 through the buffer controller 12. To be stored.

When a certain amount of data is stored in the data buffer 13 and the data is ready to be transferred to the host computer 15, the host computer 15 is notified that the transfer is ready. The host computer 15 reads out the read data stored in the data buffer 13 through the buffer control unit 12 and the host IZF control unit 14.

If the instruction from the host is a WRITE instruction, the CPU 11 issues an instruction to each block of the disk device 1 to execute the WRITE instruction. In response, each unit operates as follows.

CPU 11 interprets the WRITE instruction and sends it to host computer 15. Notification that data transfer is ready. In response, the host computer 15 transfers data to the host IZF control unit 14. The host IZF control unit 14 temporarily stores the transferred data in the data buffer 13 through the buffer control unit 12.

When the R / W head 6 completes the seek operation and reaches the head of the target data sector, the buffer control unit 12 transfers the data stored in the data buffer 13 to the drive IZF control unit 9. The ECC controller 10 adds an error detection and error correction code to the data transferred to the drive IZF controller 9. The drive I / F control unit 9 sends this to the RZW head 6 through the signal processing device 3 and the R / W amplifier 4. The RZW head 6 records this in a target data sector of the data surface recording medium 7.

In the READ / WR ITE operation described above, a cylinder address and a data sector address are required. Of these, the cylinder address is stored in servo sector 16. On the other hand, the data sector address is generated by the servo control section 8 "using the servo sector information. Hereinafter, the servo control section 8 will be described with reference to FIG. The members and operations described in Fig. 1 may not be repeatedly described.

Based on the read data pulse (RDP) 48 input from the signal processing device 3, the servo control unit 8 、 generates a cylinder address (CYL) 22, a data sector address (DSA) 57, Control signals (split length SPTL 56, sector pulse SCTP58, index pulse IDXP 59) are generated. The servo control unit 8 # outputs the generated control signals and the like to the signal processing device 3 and the drive interface control unit 9.

Further, the servo control unit 8 ″ controls the movement of the RZW head 6 and the rotation of the data surface recording medium 7 by controlling the motor driver 5 based on servo sector information.

An outline of the operation in the servo control unit 8 will be described.

A data sector 17 and a servo sector 16 are recorded on the data surface recording medium 7 (see FIG. 2). Servo sector 16 is used to move and position RZW head 6. And is used to generate the segmenter pulse (SCTP) 58.

The data read from the servo sector by the RZW head 6 is subjected to predetermined processing in the RZW amplifier 4 and the signal processing device 3, and then the read data pulse (RD

P) 48 is input to the servo controller 8〃.

The CRC152 performs an error check on IDXM20 / SCTM21, CYL22, SSA23, etc. (see SSCT example 2 in Fig. 2).

In the example shown in Fig. 2, the gray code is replaced with the cylinder address (CYL) 22.

—The head address (HD) 50 may be included as shown in FIG.

The data sector address generation circuit 46 ′ generates a data sector address (DSA) 57 based on the servo sector address (SSA) 23 captured by the current servo address latch 39 and outputs the data sector address (DSA) 57 to the drive IZF control unit 9. Also,

— Generate and output an index of the data sector information table 44 'based on the boss sector address (SSA) 23. The index is information necessary to refer to the data sector information table 44 'of the present embodiment.

The data sector information table 44 'outputs various data corresponding to the output index. Here, it is simply called “table” 44 ′, but in actuality, a memory storing information (table) that associates the index with various data, and an index input from the data sector address generation circuit 46 ′. A circuit for obtaining an address in which various data corresponding to the data is stored, and reading data from the address of the memory. However, these reading circuits and the like may be provided in the SCTP generation circuit 45. The manner of sharing these functions is not particularly limited.

The SCTP generation circuit 45 generates a sector pulse (SCTP) 58 and an index pulse (IDXP) 59 based on the data output from the data sector information table 44 ', and outputs them to the drive IZF control unit 9. SCT P 58 is a signal indicating the head position of data sector 18.

The split length generation circuit 47 generates a split length (SPTL) 56. Generate and output to drive I ZF controller 9. The split length (SPTL) is a value indicating the length of the data of the first DATA 1 (29) included in the data sector (DSCTB) 17-2.

The main feature of the present embodiment is the generation of the data sector address by the data sector address generation circuit 46 '. It also features a data sector information table 44 ', a SCPP generation circuit 45, and a split length generation circuit 47. Accordingly, these are described in more detail below.

Before describing the specific configuration of each unit, first, a method of calculating a data sector address and a method of calculating an index in the present embodiment will be described.

First, the periodicity of the arrangement of the sectors used by the calculation method according to the present invention will be described.

FIG. 12 shows the positional relationship between the servo sector and the data sector on the cylinder of the data surface recording medium 7.

As can be seen from Fig. 12, servo sectors are recorded at regular intervals in all cylinders. The servo sector address (SSA) starts from "0". The servo sector (S SCTB 16-2) of servo sector address (S S A) = 1 and 2 divides the data sector (DSCTB 17—2). The servo sector (SSCTA 16-1) with servo sector address (SSA) = 3 is exactly between the data sector (DSA = = 7) and the data sector (DSA = 8). Therefore, the arrangement pattern of servo sectors and data sectors on each cylinder is obtained by repeating three servo sectors (SSPB = 3) and eight data sectors (DSPB = 8) as one cycle. It has become. Hereinafter, the unit of the repetition is referred to as “Boundary” 640.

A method for calculating the data sector address will be described.

To calculate the data sector address (DSA), first, the operation of the following equation (3) is performed. Equation (3) is the same as equation (1).

SSA · DSPB / SSPB (3)

However, SSA: Servo sector address

DSPB: Number of data sectors included in one Boundary 3.1

S SPB: The number of servo sectors included in one Boundary. The remainder (decimal part) of the calculation result of this equation (3) is carried forward to obtain the data sector address (DSA). For example, the calculation result of equation (3) is

If 2.3, DS A is 3.

Next, a method of calculating the index will be described.

The data sector information table 44 'stores data sector information (for example, Split Time. Split length, Split sector offset) which is difficult to calculate from the servo sector address (SSA) 23. Conventionally, it is necessary to prepare this data sector information for the number of servo sectors included in one round of the track. However, in the present invention, the number is reduced by utilizing the property of Boundary 640 described above. That is, the arrangement pattern of the data sector and servo sector in one Boundary is the same for all Boundaries. Therefore, it is sufficient to prepare data sector information for the number of servo sectors included in the Boundary.

However, in this case, in order to refer to the data sector information table 44 ', information (index) indicating the number of the servo sector from the beginning in the Boundary is required.

The index is obtained as a remainder obtained by dividing the servo sector address (SSA) 23 by SSPB as shown in the following equation (4).

Vector No. = S S A mod SSPB (4)

Vector No .: Index

S S A: Servo sector address

S SPB: Number of servo sectors included in one Boundary Next, the data sector address circuit 46 'to execute the data sector address calculation method and index calculation method described above, and the data sector info menu The specific configurations of the input table 44 ′, the SCPP generation circuit 45, and the split length generation circuit 47 will be described with reference to FIG.

In FIG. 13, the data sector address generation circuit 46 ′ includes a DSPB register 165, a multiplier 166, a selector 166, an SSPB register 168, and a divider 1. 69, consists of a Vector No. register 171, and a data sector address DSA counter 170. These are connected so that the operations of the above equations (3) and (4) can be performed. The DSPB register 165 pre-stores the number of data sectors (DSPB) contained in the Boundary. In the SSPB register 168, the number of servo sectors (SSPB) included in the Boundary is stored in advance.

The data sector information table 44 ′ stores a Split Time 173, a Split Length (SPTL) 56, and a Split Sector Offset (SPS 0) 172. The Split Time 73 is information indicating the time required from the rear end position of the servo sector to the head position of the first data sector after the servo sector. This is used when the SCTP generation circuit 45 generates the SCT P 58. Split sector offset (SPSO) 1

72 is information indicating the number of the data sector after the servo sector, the split data sector (DSCTB). As described above, the split length (SPTL) is the first DATA 1 (29) of the data sector (split data sector DS CTB 17-2) divided by the servo sector following the servo sector. ) Is the value indicating the data length (bytes) (see Fig. 2).

The 'ft' amount of the data sector information table 44 'is at least (the number of servo sectors included in one Boundary) x (the amount of information prepared for one servo sector). Actually, the Split Time can be configured as 12 bits, the split length can be configured as 1 Obit, and the split sector offset can be configured as 3 bits. In addition, the number of servo sectors included in one Boundary is 16 at most. Therefore, the data sector information table 44 ′ can be configured as information of 40 Obit (= (1 2 + 10 + 3) × 16).

The SCTP generation circuit 45 generates the IDXP 59 and the SCTP 58 using the Split Time 73. Although not shown, SCTP 58 is also output to DSA counter 170. As described above, SCTP 58 is information indicating the start position of the data sector 17-1. The split length generation circuit 150 outputs SPTL 56 to the drive IZF control unit 9. The split length generation circuit 150 includes an SPSO counter 174 and an SPTL output control circuit 175. These functions will be described later together with the operation.

In the present embodiment, the “sector arrangement” in the claims corresponds to an arrangement of servo sectors and data sectors on a cylinder (track). The "calculating means" and "further calculating means" correspond to the servo control unit 8 (in particular, the data sector address generation circuit 46 '). “Predetermined range” corresponds to the above-mentioned Boundary. The “specific arrangement pattern” corresponds to the arrangement pattern of the servo sector and the data sector in the boundary. The "table" and the storage means for storing the "table" correspond to the data sector information table 44 '. In this embodiment, the “data sector information” corresponds to the Spilit time, the split length (SPTL), and the SPSO. The “control signal generating means” includes the SCTP generating circuit 45 and the split strength generating circuit 150. "Reading means" corresponds to the signal processing device 3, the R / W amplifier 4, and the like. “Writing means” corresponds to all parts that function to write data to the recording medium 7. The above-described units operate in cooperation with each other, and the correspondence described here is not strict. In particular, the function of reading information from the data sector information table 44 'may be provided in the SCTP generation circuit 45 or the like.

The operation of the data sector address generation circuit 46 'shown in FIG. 13 will be described with reference to FIG.

Here, it is assumed that SSA = n, DSPB = B, and SSPB = A.

The servo sector address (SSA) 23 read from the current servo address latch 39 is input to a multiplier 166 and a selector 167.

The multiplier 166 calculates η · B. Then, the calculation result is output to the selector 167.

The selector 1 67 first outputs the SSA (here, n) to the divider 69. The _c divider 69 calculates n mod A (see equation (4)), and sets the remainder to the Vector No. Stored in register 171.

Next, the selector 167 outputs the multiplication result (η · B) of the multiplier 166 to the divider 169. The divider 169 calculates (n · B) ZA, and outputs the operation result (quotient and remainder) to the DSA counter 170.

The DSA counter 170 captures the result of the divider 169 in synchronization with the first STCP 58 after the servo sector 16-1 has been completed. If there is a surplus in the operation result input from the divider 169, the 03-octagon counter 170 adds one to the count value of the quotient. The count value thus obtained is output to the drive I / F control unit 9 as a data sector address (DSA) 57.

Thereafter, each time the SCTP 58 is output, the DSA counter 170 counts up by one. As a result, the drive IZF control unit 9 can determine whether or not the read sector address capability matches the data sector address of the target data sector.

The SCTP generation circuit 45 generates the IDXP 59 and the SCTP 58 using the Split Time 173.

As shown in FIG. 14, the SPSO counter 174 of the split length generation circuit 150 fetches the split sector offset (SPSO) 172 in synchronization with the first SCTP 58 after the servo sector 16-1 has finished. . Thereafter, each time SCTP 58 is output, the countdown is performed. When the value of the SPSO counter 174 becomes "0", the SPTL output control circuit 175 converts the split length input from the data sector information table 44 'into the split length (SPTL) 56 to the I / F control unit 9. Output. Normally, when the data sector is split by the servo sector, the split strength (SPTL) 56 output to the drive IZF control unit 9 cannot be “0”. Therefore, in this embodiment, the split strength (SPTL) 56 is “0”. "" Indicates that the data sector is not split by servo sectors. Therefore, as shown in FIG. 14, the split length (SPTL) 56 outputs “0” from the data sector “m” to “j−1”, and outputs the data when the data sector is “j”. Split length output from the sector information table 44 ' Is output. The output of the split length (SPTL) 56 is controlled by the split generation circuit 150 composed of the SPSO counter 174 and the SPTL output control circuit 175 shown in FIG. 13 as described above. As described above, when the value of the split strength (SPTL) 56 is "0", it indicates that the corresponding data sector is not split by the servo sector, and therefore the corresponding data sector in the data sector information table 44 'is included. By setting the value of the split length to "0", it is possible to handle the case where the data sector is not split in the next servo sector.

As described above, in this embodiment, the presence or absence of a split in the data sector is determined based on whether the value of the split strength (SPTL) 56 is not “0” or a value other than “0”, so that the data sector information table 44 ′ is used. In addition, the addition of a flag indicating whether the data sector is split in the next servo sector is omitted.

As described above, in the present embodiment, since the information amount of the data sector information table 44 'can be reduced, the scale of a circuit that holds and uses the data sector information table 44' can be reduced.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.

FIG. 15 is a block diagram showing the configuration of the data sector generation circuit 46 # and its peripheral circuits.

The fourth embodiment differs from the third embodiment (FIG. 13) in the control method of SPTL 56 (that is, the data sector DSCTB determination method). In this embodiment, instead of SPSO, SPTL 56 is controlled by comparing a predetermined calculation result described later with DSA 57.

Corresponding to this difference in the judgment method, the specific circuit configuration is also different (see Fig. 15). That is, the data SPSO 172 is not stored in the data sector information table 44 '. Also, the split-length generation circuit 150 ′ has a comparator 177 instead of the SPSO counter 174 in the third embodiment. The split-length generation circuit 150 ′ controls the SPTL 56 by comparing the result of the operation (described later) by the divider 169 with the DSA 5.7 by the comparator 177. ing. To calculate the data sector address (j) of the next split data sector (DSCTB), first, the following equation (5) is used. And it is obtained by truncating the remainder (decimal part) of the operation result. Equation (5) is the same as equation (2).

(SSA + 1)-DSPB / SSPB (5)

S S A: Servo sector address

SSPB: Number of servo sectors included in one Boundary DSPB: Number of data sectors included in one Boundary Equation (5) If the result of 5 is an integer, the next data sector is It is located between the overnight sector and the data sector, and means that the data sector is not divided.

The method and operation for obtaining the data sector address 57 and the index (Vector No.) from the servo sector address (SSA) 23 are the same as in the third embodiment.

The "second operation means" in the claims corresponds to the servo controller 8 (in particular, the data sector address generation circuit 46).

The operation of this embodiment will be described with reference to FIG.

Here, SSA = n, DSPB = B, and SSPB-2A.

The multiplier 166 and the divider 169 perform the operations of Expressions (3), (4), and (5). That is, the multiplier 166 multiplies the subsector address (SSA) by the DSPB (η · B). Then, (η + 1) · B is calculated. However, since multiplier 1666 has already performed (η · B), it is only necessary to add B to this calculation result (η · B). After that, the divider 169 obtains the vector number by performing the operation of equation (4), and stores this in the vector number register 171. Further, the divider 169 divides η · B previously obtained by the multiplier 166 by A (see equation (3)). Then, the calculation result is output to the DSA counter 170. In addition, divider 1 69

(n + 1) · Divide B by A (see equation (5)). For this operation result (quotient and remainder (decimal part)), the remainder (decimal part) is truncated and the value is retained. This value is the address of the split data sector (DSCTB 17-2). 03 Eight counter 170 captures the operation result (quotient and remainder) input from divider 169. In this case, if there is a surplus in this operation result, "1" is held as the count enable 178. If there is no remainder, the count enable 1 78 holds "0". Then, if the count is enabled, the count is incremented by one. Count enable 1 78 When the value is "0", the captured value is retained without counting up.

Thereafter, the count enable 1 78 is set to "1" by SCTP 58. Thereafter, each time the SCTP 58 is input, the DSA counter 170 counts up by one.

The comparator 177 compares the DSA57 output from the DSA counter 170 with the address of the split data sector (DSCTB) held by the divider 169, and compares the result with the SPTL output control circuit. Output to 1 75. The SPTL output control circuit 175 causes the drive IZF control unit 9 to output SPTL 56 when the comparison result of the comparator 177 is "match".

As described above, the data sector information table 44 'of this embodiment does not need to store the SPSO. Therefore, the data amount can be further reduced as compared with the third embodiment. Therefore, the circuit scale can be further reduced.

The servo sector address input to the data sector address generation circuit 46 ′ may not be the servo sector address read from the storage medium 7. The servo sector address read from the data recording medium 7 may be wrong due to the influence of noise or the like. Therefore, the servo sector address is predicted by the method described with reference to FIG. 4 or FIG. 9, and the predicted servo sector address is compared with the read servo sector address. If the results match, you can use the prediction results. Such an example will be described below as a fifth embodiment.

A fifth embodiment of the present invention will be described with reference to FIG.

FIG. 17 is a block diagram showing the configuration of the servo control unit 8 "'.

In the fifth embodiment, as shown in FIG.

Next S S A prediction circuit between 39 and data sector address generation circuit 46 ′ 1

43 are arranged. The next SSA prediction circuit 143 predicts the The robot sector address is input to the data sector address generation circuit 46 '. The next SSA prediction circuit 40 'is a counter that counts up with servo mark (SVMK) 19, index mark (I DXM) 20 and sector mark (SCTM) 21 (see Fig. 9) or When the servo sector address (SSA) continuously changes in a fixed relationship with 0, 1, 2, and 3, the servo sector address is predicted using the immediately preceding servo sector information, that is, in this case, The circuit uses the value obtained by adding 1 to the immediately preceding servo sector address as the predicted value (see Fig. 4). The "prediction means" in the claims is realized by the next SSA prediction circuit 144 and each unit operating in cooperation with the circuit.

The comparator 146 confirms the prediction result by comparing the value of the servo sector address SSA read from the data surface recording medium 7 with the value of the next SSA prediction circuit 144.

As described above, in the fifth embodiment, since the next SSA prediction circuit 144 is provided, an error in reading the servo sector address from the data surface recording medium 7 can be detected. Also, since the servo sector address is predicted in advance, there is sufficient time for calculating the data sector address (DSA).

The CPU 11 may calculate the data sector address (DSA) 57 and the index (Vector No.) 171. In this way, the multiplier 166 and the divider 169 can be eliminated, and the circuit size can be further reduced. However, since the calculation of the data sector address (DSA) 57 and index (Vector No.) 17 1 must be completed before the servo sector ends, the processing capacity is high and the CPU must be used. There is.

A processing device such as a DSP may be used for the calculation of the data sector address (DSA) 57 and the index (Vector No.) 171.

The calculation of data sector address (DSA) 57 and index (Vector No.) 17 1 can be calculated only by integer operation. Some microprocessors (microcontrollers) for embedded applications have integer multiplication instructions and integer division instructions. Using such a microprocessor can reduce the overhead required for calculations. Data Sector Address (DSA) 57 and microprocessor If the calculation of the index (Vector No.) 171 is performed, it is not necessary to provide the data sector address generation circuit 46 'for exclusive use, so that the circuit size can be further reduced. As described above, the above embodiment does not use the conversion table when obtaining the data sector address from the servo sector address. Further, the table, one may _c only comprises only the If report number fraction of mono- Bosekuta contained within Boundary Therefore, the size of the table used in this embodiment is significantly over conventional Can be smaller. For example, conventional conversion that generates data sector address (DSA) Obit). Split length (10 bit), split sector offset (3 bit) and split time (12 bit) from servo sector address (SSA) The table is 4352 bits (= (9 + 10 + 3 + 12) X 128), where the number of servo sectors is 128. On the other hand, the table when the present invention is applied is 400 bits (= (10 + 3 + 12) × 16), which is about one tenth of the conventional value.

Since the table can be reduced in this way, the circuit size of the disk device can be reduced. In particular, it is possible to suppress the cost in the case of achieving IC.

Claims

The scope of the claims

1. A disk-type storage medium that has a data sector and a servo sector and is formatted in a format in which a servo sector address indicating at least the address of the servo sector is written in the servo sector. A disk storage device that reads and / or writes data from at least one of the following:

Reading means for reading a servo sector address from the servo sector and reading data from the data sector;

Prediction means for predicting a servo sector address of a subsequent servo sector based on the servo sector address read by the reading means;

The servo sector address read by the reading means is compared with the servo sector address predicted by the prediction means based on the servo sector address read immediately before by the reading means. As a result of the comparison, A determination means for determining that the readout of the servo sector address by the readout means has been performed correctly if the values match;

If the determination means determines that the servo sector address has been read correctly, the data sector address generation means for determining the address of the data sector located after the servo sector located in the servo sector address is used. Disk storage device equipped.

2. The reading means reads data from the data sector of the address obtained by the data sector address generating means.

The disk-type storage device according to claim 1.

3. When the assignment of the servo sector address is performed in such a manner that a predetermined value is added to the address of the immediately preceding servo sector,

The prediction by the prediction means is performed by adding the predetermined value to the sub-sector address read immediately before by the reading means.

The disk-type storage device according to claim 1.

4. It has a data sector and a servo sector, and the servo sector has at least the servo sector. — A disk storage device that performs at least one of reading and writing desired data from a disk-type storage medium formatted in a format in which a servo sector address is written to Z. And

Calculating means for performing a predetermined calculation predetermined on the servo sector address read by the reading means in accordance with a servo sector address allocation method;

A comparison is made between the servo sector address read by the reading means and a result obtained by the arithmetic means performing the predetermined calculation based on the servo sector address read immediately before by the reading means, and a result of the comparison Judging means for judging that the reading of the servo sector address by the reading means has been correctly performed when the two have a predetermined relationship; and

Data sector address generation means for obtaining an address of a data sector located after a servo sector located in the servo sector address when the determination means determines that the reading of the servo sector address has been correctly performed. Disk type storage device.

5. The reading means reads data from the data sector of the address obtained by the data sector address generating means.

5. The disk storage device according to claim 4.

6. In the case where the servo sector address is assigned by adding a predetermined value to the address of the immediately preceding servo sector,

The calculation by the calculation means is to add the predetermined value to the sub-sector address read immediately before by the reading means.

5. The disk storage device according to claim 4.

7. A disk-type storage medium having a data sector and a servo sector, and the servo sector address indicating the address of the servo sector at least in the servo sector. data from A disk storage device that performs at least one of reading and writing of:

When the start mark of a track composed of a plurality of data sectors and a plurality of servo sectors is detected, the count value is reset, and each time a servo sector is detected, the count value is incremented by a predetermined value. Counting means; and comparing the servo sector address read by the reading means with the count value of the counting means. As a result of the comparison, if the two have a predetermined relationship, the data is read by the reading means. Determination means for determining that the readability of the boss sector address has been correctly performed; and

When the determining means determines that the reading of the servo sector address has been correctly performed, the data sector address generating means obtains the address of the data sector arranged following the servo sector located in the servo sector address. A disk storage device comprising:

8. The reading means reads data from the data sector of the address obtained by the data sector address generating means.

The disk storage device according to claim 7.

9. Further comprising a second determination means for determining whether or not the address obtained by the data sector address generation means and the address of the data sector to be accessed at that time match each other,

8. The disk-type storage device according to claim 1, wherein the read means reads data from a data sector located at the address when the two values match as a result of the determination by the second determination means. apparatus.

10. writing means for writing data to be written into the data sector;

At the time of data writing, a second determining means for determining whether or not the address obtained by the data sector address generating means matches the address of the data sector to be accessed at that time; 8. The disk-type storage device according to claim 1, wherein the writing means writes data to the data sector in the writing means when the results of the determination by the second determination means match. .

11. From a disk-type storage medium that has a data sector and a servo sector and is formatted in a format in which a servo sector address indicating at least the servo sector address is written in the servo sector, A control device used in a disk storage device that performs at least one of reading and writing of desired data according to the following:

Predicting means for predicting a servo sector address of a subsequent servo section based on the servo sector address read by the head;

The servo sector address read by the head is compared with the servo sector address previously predicted by the prediction means. If the two match, the servo sector address is compared. Means for determining that is correct,

A control device for a disk-type storage device having:

12. A disk-type storage medium that has a data sector and a servo sector and is formatted in a format in which at least a servo sector address indicating the address of the servo sector is written in the servo sector. A control device used in a disk storage device that performs at least one of reading and writing of desired data, and includes:

When a start mark of a track composed of a plurality of data sectors and a plurality of servo sectors is detected in the signal read by the head, the count value is reset, and the servo sector is detected. Counting means for incrementing the count value by a predetermined value each time the count is performed; and

The servo sector address read from the storage medium by the head is compared with the count value of the counting means. If the comparison shows that the two have a predetermined relationship, the head is used. Determining means for determining that the servo sector address read from the storage medium is correct;

A control device for a disk-type storage device having:

13. Judgment of servo sector address read from servo sector of recording medium The method is:

Predicting the servo sector address of the next servo sector based on the servo sector address read from the servo sector; and

The predicted servo sector address is compared with the servo sector address read from the next servo sector. If the two match, the read servo sector address is correct. judge,

A correct / incorrect determination method of servo sector address having steps.

14. A true / false determination method of a servo sector address read from a servo sector of a recording medium, comprising:

When the start mark of the track is detected, the count value is reset, and each time a servo sector is detected, the count value is incremented by a predetermined value; and

The servo sector address read from the servo sector is compared with the above count value. If the comparison shows that the two have a predetermined relationship, the servo sector address read at this time is correct. judge,

A correct / incorrect determination method for servo sector addresses having steps.

15. The storage medium is formed of a predetermined sector arrangement with the servo sector and the data sector, and the data address generation means is included in a predetermined range on the sector arrangement. And information indicating the number of servo sectors included in a predetermined range on the sector array. The servo sector address read by the reading means is expressed by the following equation. Is calculated, and the decimal part of the calculation result is rounded up, so that the “data sector” indicating the address of the first data sector starting from the servo sector indicated by the servo sector address used in the calculation of the above formula in the sector array is obtained. Having computing means for determining the stigmatic address;

S S A · D S P B / S S P B

However, SSA: servo sector address

DSPB: Number of data sectors included in the above-mentioned predetermined range in the above-mentioned sector arrangement SSPB: Number of servo sectors included in the above-mentioned predetermined range in the above-mentioned sector arrangement

The disk-type storage device according to claim 1.

16. The sector array allows the servo sector to be positioned so as to divide the data sector at an intermediate position of the data sector, and uses the servo sector address read by the reading means. By performing the operation of the following expression and rounding down the decimal point of the operation result, the address of the data sector divided by the servo sector next to the servo sector indicated by the servo sector address used in the operation of the expression in the above-mentioned sector arrangement is obtained. Further comprising a second calculating means for obtaining

(S S A + 1) DS PB / S S PB

The disk-type storage device according to claim 15.

17. The storage medium is formed with the servo sector and the data sector force, a predetermined sector arrangement,

The sector array allows the servo sector to be located so as to divide the data sector at an intermediate position of the data sector, and the address generation means is arranged in a predetermined range on the sector array. Information indicating the number of included data sectors and information indicating the number of servo sectors included in a predetermined range in the sector arrangement, and a sub-sector address of the servo sector read by the reading means. By performing the operation of the following expression and truncating the decimal part of the operation result, the data is divided by the servo sector next to the servo sector indicated by the servo sector address used in the operation of the expression on the sector array. (SS A + 1) · DS PB / SS PB

However, SSA: servo sector address

DSPB: Number of data sectors included in the above-mentioned predetermined range in the above-mentioned sector arrangement

S SPB: Number of servo sectors included in the above-mentioned predetermined range in the above-mentioned sector arrangement The disk-type storage device according to claim 1.

18. storage means for storing a table in which data sector information prepared for each servo sector and an index indicating the position of the servo sector within the predetermined range are stored;

A further calculating means for obtaining the index based on the servo sector address;

Control signal generating means for acquiring the data sector information corresponding to the index obtained by the further arithmetic means from the table, and generating and outputting a control signal according to the acquired data sector information;

The disk-type memory device according to claim 15, further comprising:

19. The further calculating means finds the index as a remainder obtained by dividing the S S A by the S S P B,

19. The disk storage device according to claim 18.

20. The sector array is a repetition of a specific array pattern. The predetermined range is the specific array pattern. The table has the index and the corresponding data sector information. Are stored for only one of the predetermined ranges,

19. The disk storage device according to claim 18.

21. At least one of the calculating means and the second calculating means performs a corresponding calculation using the servo sector address predicted by the predicting means.

The disk-type storage device according to claim 15, 16, or 17.

22. Further comprising a writing means for writing data to the storage medium

A disk-type storage device according to claim 15 or 17.

23. The storage medium is formed of the servo sector, the data sector and a predetermined sector array, and the data address generating means is included in a predetermined range on the sector array. And information indicating the number of servo sectors included in a predetermined range on the sector arrangement.The following equation is calculated using the servo sector address read by the reading means. And cut off the decimal part of the operation result. The arithmetic means for obtaining a data sector address indicating the address of the first data sector starting after the servo sector indicated by the servo sector address used in the calculation of the above formula in the sector array,

S S A · D S P B / S S P B

However, SSA: Servo sector address

D SP B: Number of data sectors included in the above-mentioned predetermined range in the above-mentioned sector arrangement

S SP B: Number of servo sectors included in the above-mentioned predetermined range in the above-mentioned sector arrangement

5. The disk storage device according to claim 4.

24. The sector arrangement allows the servo sector to be located so as to divide the data sector at an intermediate position in the data sector, and stores the servo sector address read by the reading means. By performing the operation of the following expression and rounding down the decimal point of the operation result, the above sector arrangement is divided by the servo sector next to the servo sector indicated by the servo sector address used in the operation of the expression. Further comprising a second operation means for determining the address of the data sector being read.

(S S A + 1) D S P B / S S P B

The disk storage device according to claim 23.

25. The storage medium, wherein the servo sector and the data sector are formed in a predetermined sector arrangement,

The sector array allows the servo section to be positioned so as to divide the data sector at an intermediate position in the data sector, and the address generation means includes the servo sector in a predetermined range on the sector array. Information indicating the number of data sectors and the information indicating the number of servo sectors included in a predetermined range in the sector arrangement, and the servo sector address of the servo sector read by the reading means. By performing the operation of the following expression using, and cutting off the decimal part of the operation result, the next sub-sector of the sub-sector indicated by the sub-sector address used in the operation of the above-described sector array is obtained. Having arithmetic means for calculating the address of the data sector divided by the sector;

(S SA + 1) DSPB / S SPB

However, SSA: Servo sector address

SSPB: Number of servo sectors included in the above-mentioned predetermined range in the above-mentioned sector arrangement

The disk-type storage device according to claim 4.

26. storage means for storing a table in which data sector information prepared for each of the servo sectors and an index indicating the position of the servo sector within the predetermined range are stored;

Control signal generating means for acquiring the data sector information corresponding to the index obtained by the further calculating means from the table, and generating and outputting a control signal according to the acquired data sector information;

26. The disk storage device according to claim 23, further comprising:

27. The further calculating means calculates the index as a remainder obtained by dividing the SSA by SSPB.

26. The disk storage device according to claim 26.

28. The sector arrangement is a repetition of a specific arrangement pattern. The predetermined range is the specific arrangement pattern. The table includes the index and the corresponding data sector information. Are stored for only one of the predetermined ranges,

26. The disk storage device according to claim 25.

29. At least one of the calculating means and the second calculating means performs a corresponding calculation using the servo sector address predicted by the predicting means.

The storage device according to claim 23, 24, or 25.

30. Further comprising a writing means for writing data to the storage medium

26. The disk storage device according to claim 23.

31. The storage medium, the servo sector and the data sector are formed in a predetermined sector arrangement, and the data address generation means is included in a predetermined range on the sector line. Information indicating the number of data sectors and the information indicating the number of servo sectors included in a predetermined range on the sector arrangement. By using the following formula to calculate the result and rounding up the decimal part of the calculation result, the address of the first data sector starting from the servo sector indicated by the servo sector address used in the calculation of the above formula in the sector array is indicated. Having arithmetic means for determining a data sector address;

S SA · DSPB S SPB

However, SSA: Servo sector address

DS PB: Number of data sectors included in the above-mentioned predetermined range in the above-mentioned sector arrangement

The disk storage device according to claim 7.

32. The sector array allows the servo sector to be located so as to divide the data sector at an intermediate position in the data sector, and uses the servo sector address read by the reading means. By performing the operation of the following expression and truncating the decimal point of the operation result, the data divided by the next servo sector of the servo sector indicated by the servo sector address used in the operation of the above expression in the sector array. Further comprising second calculating means for obtaining an address of the sector,

(S SA + 1) DSPB / S SPB

31. The disk storage device according to claim 31.

33. The storage medium, wherein the servo sector and the data sector are formed in a predetermined sector arrangement, The sector arrangement allows the servo sector to be located so as to divide the data sector at an intermediate position in the data sector, and the address generation means is predetermined on the sector arrangement. Information indicating the number of data sectors included in the range and information indicating the number of servo sectors included in the predetermined range in the sector arrangement, and read by the read means. By using the servo sector address of the servo sector and performing the operation of the following expression and truncating the decimal point of the operation result, the sub-sector indicated by the servo sector address used in the operation of the expression in the sector array is obtained. Second arithmetic means for determining the address of the data sector divided by the next servo sector of

(S SA + 1) DSPB / SSPB

However, SSA: Servo sector address

S SPB: Number of servo sectors included in the above-mentioned predetermined range in the above-mentioned sector arrangement

The disk storage device according to claim 7.

34. storage means for storing a table in which data sector information prepared for each servo sector and an index indicating the position of the servo sector within the predetermined range are associated with each other;

Control signal generating means for acquiring the data sector information corresponding to the index obtained by the further calculating means from the table, and generating and outputting a control signal according to the acquired data sector information; and ,

34. The disk-type storage device according to claim 31, further comprising:

35. The third computing means obtains the index as a remainder obtained by dividing the SSA by SSPB.

The disk storage device according to claim 34.

36. The sector arrangement is a repetition of a specific arrangement pattern. The predetermined range is the specific arrangement pattern. The table includes the index and the corresponding data sector. Information is stored for only one of the above-mentioned predetermined ranges,

The disk storage device according to claim 34.

37. At least one of the calculating means and the second calculating means performs a corresponding calculation using the servo sector address predicted by the predicting means.

The disk storage device according to claim 31, 32, or 33.

38. The apparatus further includes a writing unit that writes data to the storage medium.

The disk storage device according to claim 31 or 33.

39. A control used in a storage device for reading information from a storage medium having at least a servo sector storing its own address and a data sector for storing data in a predetermined sector array. With the device:

The information includes information indicating the number of data sectors included in a predetermined range on the sector array and information indicating the number of servo sectors included in a predetermined range on the sector array. Using the servo sector address indicating the address of the servo sector obtained, the following equation is calculated, and the result of the calculation is rounded up to the nearest decimal point, so that the servo sector address used in the calculation of the equation is calculated on the sector array. Computing means for determining a data sector address indicating the address of the first data sector starting after the indicated servo sector;

S S A · D S P B / S S P B

However, SSA: servo sector address

Control device for disk storage devices.

40. The sector arrangement allows the servo section to be positioned so as to divide the data sector at an intermediate position in the data sector. By using the read servo sector address and performing the operation of the following expression and truncating the decimal point of the operation result, the servo array address indicated by the servo sector address used in the operation of the expression is obtained on the sector array. A second calculating means for determining an address of a data sector divided by a servo sector next to the servo sector;

(SSA + 1) DSPB / SSPB

40. The control device for a disk storage device according to claim 39.

41. A control device for a storage device that reads information from a storage medium formed of a servo sector in which at least its own address is stored, a data sector for storing data, and a power supply for storing data in a predetermined sector arrangement,

The sector array allows the servo sector to be located so as to divide the data sector at an intermediate position of the data sector. It has information indicating the number of included data sectors and information indicating the number of servo sectors included in a predetermined range in the above-mentioned sector arrangement, and has a signal indicating the address of the read servo sector. By performing the operation of the following equation using the sector address and rounding down the decimal point of the operation result, the above sector array is divided by the servo sector next to the servo sector indicated by the servo sector address used in the operation of the equation. Computing means for determining the address of the data sector being

(SSA + 1) DSPB / S S PB

However, S SA: Servo sector address

Control device for disk storage devices.

42. Storage means for storing a table in which data sector information prepared for each servo sector and an index indicating the position of the servo sector within the predetermined range are stored.

Further calculating means for obtaining the index based on the servo sector address Dan and.

The control of the disk storage device according to claim 39, further comprising:

43. The control device for a disk-type storage device according to claim 42, wherein said further arithmetic means obtains said index as a remainder obtained by dividing said SSA by SSPB.

44. The sector array is a repetition of a specific array pattern, the predetermined range is the specific array pattern, and the table includes the index and the corresponding data sector. Information is stored for one of the above-mentioned predetermined ranges.

A control device for a disk storage device according to claim 42.

45. It further comprises a prediction means for predicting the next servo sector address,

At least one of the operation means and the second operation means performs a corresponding operation using the servo sector address predicted by the prediction means.

A control device for a disk-type storage device according to claim 39, 40 or 41.

46. A storage device for reading information from a storage medium in which at least a servo sector storing its own address and a data sector for storing data are formed in a predetermined section arrangement:

Reading means for reading information stored in the storage medium; information indicating the number of data sectors included in the predetermined range on the sector array; and information included in the predetermined range on the sector array. By using the servo sector address indicating the number of servo sectors read by the read means, the following equation is performed using information indicating the number of servo sectors that have been read out by the reading means. A control device having an operation means for obtaining a data sector address indicating an address of a first data sector starting from a servo sector indicated by the servo sector address used in the operation of the equation on the sector array; SSADS PB SS PB

However, SSA: servo sector address

Disk type storage device having the same.

47. The sector array allows the servo sector to be located so as to divide the data sector at an intermediate position in the data sector, and the control device reads the servo sector read by the reading means. Using the one-sector address, the following operation is performed, and the decimal part of the operation result is truncated, thereby dividing the sector array by the servo sector next to the servo sector indicated by the servo sector address used in the operation of the expression. Further comprising second calculating means for determining the address of the data sector

(SSA + 1). DSPB / SSPB

47. The disk storage device according to claim 46.

48. A storage device for reading information from a storage medium having at least a servo sector storing its own address and a data sector for storing data in a predetermined sector arrangement:

Reading means for reading information stored in the storage medium, wherein the sector array allows the servo sector to be located at an intermediate position of the data sector so as to divide the data sector; and

Information indicating the number of data sectors included in a predetermined range on the sector array and information indicating the number of servo sectors included in a predetermined range on the sector array; Using the servo sector address indicating the address of the read servo sector, the following equation is calculated, and the decimal part of the calculation result is truncated to obtain the servo sector address used for the calculation of the equation in the sector array. Control having second arithmetic means for determining the address of a data sector divided by the servo sector following the servo sector to be pointed Means,

(S SA + 1) DSPB / S SPB

However, SSA: Servo sector address

Disk type storage device having the same.

49. The control device is:

Storage means for storing a table in which the data sector information prepared for each servo sector and an index indicating a position in the above-mentioned predetermined range of the servo sector are stored;

Further computing means for determining said index based on said servo sector address;

Control signal generating means for obtaining the data sector information corresponding to the index obtained by the further calculating means from the table, and generating and outputting a control signal according to the obtained data sector information;

The disk storage device according to claim 46, further comprising:

50. The disk-type storage device according to claim 49, wherein said further calculating means obtains said index as a remainder obtained by dividing said SSA by SSPB.

51. The sector arrangement is a repetition of a specific arrangement pattern, the predetermined range is the specific arrangement pattern, and the table includes the index and the data sector corresponding to the index. The disk-type storage device according to claim 49, wherein the ft information is stored for only one of the predetermined ranges.

52. The control device comprises:

Equipped with a prediction means for predicting the next servo sector address,

At least one of the calculation means and the second calculation means performs a corresponding calculation using the servo sector address predicted by the prediction means. The disk storage device according to claim 46, 47, or 48.

53. The disk storage device according to claim 46, further comprising a writing unit that writes data to the storage medium.