JPH07235137A - Data-recording/reproducing apparatus and servo processing method therefor - Google Patents

Abstract

PURPOSE:To obtain a data-recording/reproducing apparatus which can correctly detect a head position of a data sector and surely make access to data without setting a specific area on a disc to record an address mark even when servo sector pulses are not continuously generated. CONSTITUTION:A servo processing circuit 11 extracts a servo sector number recorded at a predetermined position of each servo area of a disc 1 so as to identify each servo area. A sector pulse-generating circuit of the servo processing circuit generates a data sector pulse at a timing corresponding to a head position of a data sector determined based on the servo sector number.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus, such as a hard disk apparatus, for accessing a disk in sector units.

[0002]

2. Description of the Related Art Conventionally, in a data recording / reproducing apparatus such as a hard disk device (HDD), a disk 1 which is a recording medium is used.
Data is recorded and reproduced by the head on the surface of the. As shown in FIG. 26, the disk 1 has a large number of tracks formed in the radial direction, and each track is divided into a plurality of sectors DS. Normally, the disk 1 used for the HDD uses one side or both sides of a plurality of sheets as the data side, and therefore the tracks are handled by the concept that tracks in the same axial direction are called cylinders. Therefore, each track is referred to as a cylinder CL here.

Each sector DS is roughly divided into a header portion 1a including an ID area and a user data area 1b. Further, in the sector servo type HDD, a servo area SA in which servo data is recorded is provided at the beginning of the sector DS. The servo area SA is radially recorded on the disk 1 for each sector DS of all cylinders CL.

The servo area SA is data used for head positioning control, and as shown in FIG. 25, a cylinder code area 13e and a burst pattern area 13 are provided.
have g. The servo system of the HDD executes speed control for moving the head to a target cylinder (target track) based on the cylinder address reproduced from the cylinder code area 13e by the head. When the head reaches the target cylinder, position control for positioning the head at the center of the target cylinder is executed based on the burst data (position signal) reproduced from the burst pattern area 13g.

In addition to this, the servo area SA is shown in FIG.
As shown in, AGC area 13a, erase area 1
3b, 13i, reference signal areas 13c, 13f, 13
h, and sector / index pattern area 13
have d. Sector / index pattern area 1
3d is an area in which a signal pattern for generating the servo sector pulse SSP or the servo index pulse SIP is recorded. The servo sector pulse SSP is
This is a pulse output for each servo area SA. Further, the servo index pulse SIP is applied to the cylinder CL.
Is a pulse that serves as a reference point of, and is a pulse that is output only at a specific position.

The ID area of the sector DS is, as shown in FIG. 24, a PLL / SYNC area 14a, a SYNC byte area 14b, a cylinder code (upper byte) area 14c, a cylinder code (lower byte) 14d, a head number area 14e, It has a sector number area 14f, a flag byte area 14g and a CRC byte area 14h. After the data area 1b, ECC (err
or checking and correctio
n) An ECC area 1c in which a code is recorded is provided. The ECC code is used for error check and correction processing when reading data from the data area 1b.

The PLL / SYNC area 14a is an area for synchronizing the data discrimination window before reading the header portion 1a, and records a synchronization pattern of a predetermined frequency. SYNC byte area 14b
Indicates that the NRZ (non return to ton) input due to synchronization in the PLL / SYNC area 14a.
information for recording synchronization for demodulating the (zero) code signal byte by byte. In the HDD, the read data reproduced by the head is converted into NRZ code.

The cylinder code area is an area in which a cylinder address (cylinder number) corresponding to a sector is recorded. The upper 8 bits of the upper byte area 14c and the lower 8 bits of the lower byte area 14d are recorded. There is. The head number area 14e records a head number (byte) selected when accessing a sector. The sector number area 14f records a sector number (byte) for identifying a sector. The flag byte area 14g is an area for recording flag information and the like when a failure occurs in the sector data area 1b. The CRC byte area 14h is a C for verifying whether the contents are normal when the cylinder code, head number, sector number and flag information are read.
RC (Cyclic redundancy check)
k) This is an area for recording a code (byte).

By the way, in recent years, in order to increase the recording density of data, CDR (constant densi) is used.
A ty recording) HDD has been developed. In the CDR system, as shown in FIG. 23, the disk 1 is radially divided into a plurality of zones (here, six zones Z1 to Z6 for convenience), and each zone includes several tens to several hundreds of cylinders (tracks). )It is included.

The CDR system has a sector structure in which the physical circumference of a cylinder is assumed and the recording density for the circumference is made substantially constant, and the data transfer rate is different for each zone.

Servo area SA (here, SA0-SA
7) is recorded radially on the disk 1 over each zone. Therefore, the servo area SA is not always
It will not be placed at the beginning of each sector. For example,
In zone Z1, servo area SA0 is located at the beginning of data sector 0, but servo area SA1 is located in front of part of data sector 3. In other words, in the CDR method, the servo sector based on the servo area SA and the data sector included in each servo sector are treated as a concept. Normally, each servo sector includes a plurality of data sectors with consecutive sector numbers. However, as shown in FIG. 23, for example, in servo areas SA0 and SA1, the data sector (sector number 3) may be divided and included in each servo area. Further, the ID area of each data sector is arranged differently for each zone.

As described above, servo data as shown in FIG. 25 is recorded in the servo area SA. Here, for each cylinder, as shown in FIG. 22, a cylinder code and burst data are recorded as a magnetic pattern. Further, in the CDR method, as shown in FIG.
Servo sector pulse S at the timing of servo area SA
SP (or servo index pulse SIP) is generated, and the data sector pulse DSP is generated at the timing of the ID area of the data sector.

In the HDD, when the head is positioned at the target cylinder based on the servo data, a read operation of reading the ID information of the sector is executed in order to access the designated sector. In this reading operation, when the read signal from the head detects a predetermined voltage for a certain period of time, it is determined that the information "1" has been read.

Specifically, as shown in FIG.
A read signal that exceeds a predetermined slice level for a certain period of time is detected as information "1". At this time, if the data discrimination window is synchronized with the magnetic recording on the disk 1, normal information can be detected from the read signal. However, as shown in FIG. 20B, if the data discrimination window is not synchronized with the magnetic recording on the disk 1, erroneous information will be detected for the same read signal. In order to synchronize such a data discrimination window with magnetic recording, as shown in FIG.
A PLL / SYNC area 14a is provided.

Further, as shown in FIG. 24, the gain of the circuit is adjusted in the AGC area 13a of the servo area so that the amplitude of the output signal is adjusted to be constant. After that,
Reference signal area 1 after detecting erase area 13b
3c is detected, and the preparation for reading the servo data is completed. At the start of reading the servo data, a position called a start bit immediately after the erase area, specifically, a position at which the first signal is detected after detecting the erase area after the reference signal area is recognized as a start bit.
The start bit synchronizes the circuit, and the servo sector pulse SSP or the servo index pulse SIP is output according to the pattern continuous with the circuit.

The cylinder code is usually recorded by an encoding method called a gray code. The Gray code is a binary code in which, when a continuous numerical value is expressed in a binary number, adjacent numerical values are different from each other by only 1 bit. Specifically, for example, the decimal number “6, 7, 8” is the gray code “00
101,00100,01100 ". As a general formula, the i-th bit Gi of the Gray code is “Gi =
Bi XOR Bi + 1 ”. Bi is the i-th bit when a decimal number is converted into a binary number. XOR is a symbol indicating an exclusive OR operation.

By using such a gray code, the cylinder code is accessed when the head is moved to the target cylinder, but the deviation of the read data can be kept within one cylinder. As a specific example, as shown in FIG. 19A, when the head crosses the cylinder “n + 2” to the cylinder “n + 1”, the same cylinder code as when the head is located on the cylinder n is read. .

In FIG. 19A, cylinder code 1
3e is recorded by the Gray code. Further, in the burst area 13g, a position signal (burst data) for detecting a position shift amount with respect to the center of the target cylinder based on the amplitude of the output signal is recorded. Same figure (B)
Is the actual recording state of the cylinder code converted into the Gray code, and after the clock bit (CLK) is generated, in the area of the next data discrimination window,
It indicates that when a signal is output, it is recognized as information "1". In addition, it indicates that no signal is output in the area of the next data discrimination window, and when the signal is output in the area next to that, the information is recognized as information "0".

[0019]

As mentioned above, the CDR
In the conventional HDD including the system, the ID information in the ID area is first referred to when the specified data is accessed from the disk 1. When it is recognized from the ID information that the sector is an access target, an access to a data area continuous to the ID area is executed.
At this time, the ID information in the ID area cannot be read unless the access is made from the head position of the ID area. As shown in FIG. 24, when the access is started from the cylinder code area 14c, for example, PLLSYN
Since the circuit area cannot be synchronized by the C area 14a, the data discrimination window and the magnetic recording cannot be synchronized.

Therefore, as shown in FIG. 21, it is necessary to generate the data sector pulse DSP, detect the head position of the data sector, and surely access. As a method for detecting the start position of this data sector, there is a method in which specific information called an address mark is recorded in advance on the disk 1 and the start position is determined according to the detection of this specific information. However, in this method, it is necessary to prepare an area for recording the address mark on the disc 1,
There is a drawback that the data recording area is reduced by that area.

As another method, there is a method in which counting is started from the generation of a servo index pulse in the servo area, the position of the servo area is specified by the number of the count value, and the head position of the data sector is determined. .
However, with this method, accurate counting becomes impossible when the servo sector pulse does not occur continuously. Normally, if no servo sector pulse is continuously generated within a time interval 1.2 times the servo sector pulse generation interval, it is determined that there is a pulse generation omission for some reason. For example, even if a servo pulse is generated after five consecutive skips, its position cannot be accurately specified. This is because there is an error in the normal generation interval. For example, when a pulse occurs immediately after the measurement of five consecutive omissions, the number of omissions due to the actual continuous measurement time is 5, whereas the actually generated pulse starts from the position where the omission starts. Since it is the sixth, an error may occur in a simple counting operation.

Further, when the head switching operation is executed, the number of servos may be erroneously counted depending on the switching timing of the head selection. This is because the position where the servo data is recorded may not match between the front surface and the back surface of the disk 1. In particular,
As shown in FIG. 18, the front surface of the disk 1 is a data surface A and the back surface is a data surface B. In this case, for example, when the head A corresponding to the data surface A is switched to the head B corresponding to the data surface B, the count value “11” and the servo number “10” do not match.

By the way, even in the CDR system as described above, an ID area is provided in each data sector, and an ID such as a cylinder code or a sector number is provided from this ID area.
It is assumed that the information is read. On the contrary,
In order to increase the recording density, as shown in FIG. 24, ID
From area, especially from cylinder code 14c to sector number 1
A method has been proposed in which ID information up to 4f is reduced to reduce the ID area.

However, when the ID information is reduced, the data sector to be accessed cannot be specified by simply generating the data sector pulse DSP and detecting the head position of the data sector. In addition, when there is a defect in a certain data sector,
A defect processing method for executing a skip operation that does not access the defective sector is well known. In this defect processing method, a spare sector (spare data sector) prepared in advance for each track is used as a replacement sector for a defective sector. In the defect processing method, the sector number of the defective sector registered in advance and the accessed ID
The skip operation is executed by comparing the sector number of the information. However, in the method in which the ID information is reduced, the skip operation cannot be executed because there is no sector number to be compared.

It is a first object of the present invention to provide a data recording / reproducing apparatus capable of accurately detecting the head position of a data sector without providing a specific area for recording an address mark on a disc. The second object of the present invention is to
To provide a data recording / reproducing apparatus capable of accurately detecting the head position of a data sector and accurately identifying a data sector to be accessed even when a method of reducing ID information in an ID area is adopted. . A third object of the present invention is to provide a data recording / reproducing apparatus which can surely realize a defect process for a defective sector when a method in which ID information in an ID area is reduced is adopted.

[0026]

According to a first aspect of the present invention, servo sector information is recorded in each servo area in a disk having a plurality of servo areas in which servo data for positioning control of a head at a designated track position is recorded. The data recording / reproducing apparatus is provided with a disk and a data sector identifying means for identifying a data sector based on the servo sector information.

A second aspect of the present invention is a disk having a plurality of servo areas in which servo data for positioning the head at a specified track position is recorded, and a disk in which servo sector information is recorded in each servo area. The data recording / reproducing apparatus is provided with a deciding means for deciding the head position of each data sector on the basis of it and a sector pulse generating means for generating a data sector pulse at a timing according to the decided head position.

A third aspect of the present invention is a disk having a plurality of servo areas in which servo data for controlling the positioning of a head at a designated track position is recorded, and a disk in which servo sector information is recorded in each servo area. Determining means for determining the head position of each data sector based on the sector position, sector pulse generating means for generating a data sector pulse at a timing according to the determined head position, defect information storage means for storing defect information indicating a defective sector, and The data recording / reproducing apparatus is provided with a control means for stopping the generation of the sector pulse in the defective sector.

[0029]

In the first aspect of the present invention, the servo sector information recorded in the servo area is information such as a servo number for identifying the servo area. The data sector identification means identifies the data sector included in the servo area of the servo sector information based on the servo sector information reproduced by the head.

In the second aspect of the present invention, the determining means determines the head position of each data sector corresponding to the servo area of the servo sector information based on the servo sector information reproduced by the head. The sector pulse generating means generates a data sector pulse at a timing according to the head position of the data sector determined by the determining means.

In the third aspect of the present invention, the defect information storage means stores the defect information indicating a defective sector in which data cannot be recorded in the data sector. The control means controls the sector pulse generation means to generate a data sector pulse at a timing corresponding to the head position of each data sector excluding the defective sector when the data sector pulse corresponding to the servo area having the defective sector is generated. Let

[0032]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram showing a main part of a hard disk drive (HDD) according to the first embodiment, and FIGS. 2 and 3 are conceptual views showing a format of a servo area according to the first embodiment. FIG. 4 is a block diagram showing the configuration of a data sector pulse generation circuit according to the first embodiment, and FIG.
Is a timing chart for explaining the operation of the data sector pulse generating circuit, and FIG. 6 is a flowchart for explaining the operation of the first embodiment. (Structure of HDD) HDD is a disk 1 which is a recording medium.
It has a disk rotating mechanism for rotating the disk, a servo mechanism for positioning the head 2 on a target cylinder on the disk 1, and a read / write circuit system 3 for recording / reproducing data. The disk rotation mechanism is composed of a spindle motor 4, which drives the disk 1 to rotate, a motor driver 5, and a motor control circuit 6.

The servo mechanism includes a carriage mechanism 7 for holding the head 2, a voice coil motor (VCM) 8 for driving the carriage mechanism 7, a VCM driver 9, a VCM control circuit 10 and a servo processing circuit for driving the VCM 8. Have 11. The VCM control circuit 10 controls the VCM driver 9 according to the control amount output from the servo processing circuit 11, and drives and controls the VCM 8.

The carriage mechanism 7 has, for example, a rotary type actuator, and moves the head 2 held by this actuator in the radial direction of the disk 1. The actuator rotationally drives the disk 1 in the radial direction by the driving force of the VCM 8.

The servo processing circuit 11 extracts a cylinder code or burst data (position signal) from the servo data reproduced by the read / write circuit system 3 and outputs it to the CPU 12. Also, the servo processing circuit 11
Converts the digital control amount from the CPU 12 into D / A and outputs the analog control amount to the VCM control circuit 10. Further, the servo processing circuit 11 is, as described later,
Data sector pulse DS for detecting a data sector
It has a data sector pulse generation circuit for generating P.

The read / write circuit system 3 roughly has an encoder / decoder 3a for processing user data and a signal processing circuit 3b for processing servo data. The encoder / decoder 3 a converts the write data of the NRZ code transferred from the HDC (hard disk controller) 13 into a write signal (write current) and supplies it to the head 2. The head 2 generates a recording magnetic field corresponding to the write data by the write current and records on the disk 1. Also, the encoder / decoder 3a
Converts the read signal read from the disk 1 by the head 2 into reproduced data of NRZ code and transfers it to the HDC 13.

The signal processing circuit 3b processes the servo data including the cylinder code and burst data of the servo area read by the head 2 and outputs it to the servo processing circuit 11. The signal processing circuit 3b pulsates the cylinder code and outputs it to the servo processing circuit 11. The servo processing circuit 11 has a circuit that decodes a cylinder code from the data pulse from the signal processing circuit 3b. Further, the signal processing circuit 3b samples and holds the peak of the burst data and outputs it to the servo processing circuit 11. The servo processing circuit 11 A / B receives the burst data from the signal processing circuit 3b.
D-converts and outputs to the CPU 12.

The CPU 12 is a ROM (read only).
The speed control of the head 2 is executed by using the cylinder code from the servo processing circuit 11 based on the program stored in the y memory 14). In addition, the CPU 12
Performs the position control of the head 2 using the burst data from the servo processing circuit 11. CPU12 is RO
As will be described later, a data sector detection process for identifying a data sector is executed based on the table stored in M14 in advance.

The table stored in the ROM 14 is shown in FIG.
Servo sector information (servo sector numbers SA0 to S
A7) Sector format information of the data sector corresponding to 20. This sector format information is shown in FIG.
As shown in (4), this is information indicating the array configuration of the data sectors included in the servo sector based on the servo area SA. The sector format information includes a data sector divided into a plurality of servo sectors (sectors A and D shown in FIG. 5).
Also included is split information for identifying the.

The HDC 13 constitutes an interface between the host system (computer) 15 and the HDD and controls the transfer of read / write data. HDC13
Buffer memory 1 for read / write data in sector units
Save to 6 temporarily. The buffer memory 16 is a RAM (random access) also called a sector buffer.
ss memory).

The HDC 13 transfers the read data (reproduction data) to the host system 15 and the write data to the read / write circuit system 3. The HDC 13 executes address conversion processing for converting a logical address from the host system 15 into a physical address. The physical address is
It is an address composed of a head number, a zone number, a cylinder number, a sector number, etc. for accessing a data sector when reading / writing data from / to the disk 1. Further, as will be described later, the HDC 13 has defect information indicating a defective sector when there is a defective sector, and executes a defect process of using a spare sector as a substitute sector for the defective sector.

In such an HDD, according to the present invention,
As shown in FIG. 2, the servo area is provided with an area 20 in which servo sector information is recorded. As shown in FIG. 23, the servo sector information is code information (servo sector number) for identifying a servo sector composed of data areas included in each servo area SA0-SA7 arranged at a predetermined interval on the disk 1. is there. Here, the servo sector including the servo area SA0 that generates the servo index pulse SIP is used as the reference sector.

The servo sector information is shown in FIGS. 3 (A) and 3 (B).
As shown in (4), it is recorded in the area 20 adjacent to the cylinder address code area 13e. This area 20
The servo sector number recorded in is the cylinder code 13
Like the e, it is recorded by the Gray code. Since the Gray code is different from the usual numerical system, a predetermined conversion procedure is required to reproduce it as a continuous number. However, if the conversion method is the same system as the cylinder code 13e, there is an advantage that a circuit for demodulating a numerical value can be uniquely determined.

Further, the servo processing circuit 11 of the present invention is
As shown in FIG. 4, it has a data sector pulse generation circuit. The data sector pulse generation circuit includes first and second register groups 40 and 41, first and second selectors 42 and 43,
It has a control circuit 44, an OR circuit 45, and a timer circuit 46.

The first and second register groups 40 and 41 respectively include initial value registers 40a and 41a and reload (re).
load) registers 40b and 41b and reload count registers 40c and 41c. The initial value registers 40a and 41a are registers for storing the count value set in the timer circuit 46 at the initial stage. The reload registers 40b and 41b are registers for storing the count value set in the timer circuit 46 after the completion of the initial operation of the timer circuit 46. Reload count register 4
0c and 41c are registers for setting the contents of the reload registers 40b and 41b and storing the value of the number of repetitions when the operation of the timer circuit 46 is repeated.

Next, the operation of the first embodiment will be described. (Basic Operation of HDD) In the same embodiment, the CDR type H
The operation of the servo processing circuit 11 assuming DD will be described.
In the CDR method, as shown in FIG. 23, the disk 1 is radially divided into a plurality of zones Z1 to Z6, and each zone includes several tens to several hundreds of cylinders. Servo areas SA0-SA7 are disk 1 across each zone
Radially recorded above. Therefore, the servo area is not necessarily located at the beginning of each data sector.

As a specific example, as shown in FIG. 5, a certain servo sector based on the servo area SA includes a latter half portion of the data sector A, a plurality of data sectors B and C consecutive thereto, and a first half portion of the data sector D. A sector format in which a part is included is assumed. Further, a sector format is assumed in which a plurality of consecutive data sectors A to C and the first half of the data sector D are included (see FIG. 8).

Next, as shown in FIG. 1, when a read access request is issued from the host system 15, the CPU 12 executes a control process for positioning the head 2 on a target cylinder (target track) to be accessed. At this time, HD
C13 is the logical address from the host system 15,
The head 2 translates the physical address to be accessed.

The servo processing circuit 11 outputs the cylinder address and burst data (position signal) read from the cylinder code area 13e and the burst pattern area 13g of the servo area SA by the head 2 to the CPU 12. The CPU 12 executes speed control for moving the head 2 to the target cylinder based on the cylinder address.
Further, the position control for positioning the head 2 at the center of the target cylinder is executed based on the burst data.

Further, the servo processing circuit 11 uses the sector / index pattern area 13 of the servo area SA.
The servo sector pulse SSP or the servo index pulse SIP is generated based on the read signal from d. Based on the servo sector pulse SSP, the CPU 12 detects that the servo area SA has been read by the head 2. Also, by the servo index pulse SIP,
Detect the cylinder reference point.

When the head 2 is positioned in the target cylinder, it reads the user data from the data sector in the target cylinder and outputs it to the read / write circuit system 3. The encoder / decoder 3a of the read / write circuit system 3 converts the read signal read by the head 2 into an NRZ code and outputs it to the HDC 13. The HDC 13 temporarily stores it in the buffer RAM 16 and transfers read data in sector units to the host system 15.

When there is a write access request from the host system 15, conversely to the above, the encoder / decoder 3a of the read / write circuit system 3 writes the write data of the NRZ code transferred from the HDC 13 to the write signal ( Write current) and output to the head 2. The head 2 records the write data in the data sector of the target cylinder. (Sector pulse generation processing) In such a read / write access operation, in order to access a specified data sector to be accessed, it is necessary to detect the data sector. As shown in FIG. 24, in the method of including ID information in the ID area, the data sector to be accessed is identified by the ID information. In order to reliably access the ID area at the head position of this data sector, in the present invention, the servo processing circuit 11 generates a data sector pulse DSP indicating the position of the ID area.

When the head 2 is positioned on the target track, the servo processing circuit 11 causes the decoder circuit having the same structure as the decoder circuit for reproducing the cylinder code to perform servo sector information (FIG. 2) of the read data read by the head 2. The servo sector number is reproduced from the information recorded in the area 20 shown in FIG. 6 (step S1 in FIG. 6).

The servo processing circuit 11 has a table that is accessed by the servo sector number in advance, and searches the table for data to be stored in the first and second register groups 40 and 41 of the data sector pulse circuit. The servo sector number is code information for identifying the servo sector as described above.

The data to be stored in the first and second register groups 40 and 41 is, as shown in FIG. 5, count data for generating the data sector pulses DSP1 to DSP3 from the data sector generating circuit. Here, the servo processing circuit 11 determines the servo sector number (for example, S, which is reproduced first) after the head 2 is positioned on the target track.
Count data for generating the data sector pulse DSP necessary for the servo sector corresponding to the next servo sector number (SA1) from A0) is set in the first register group 40. Then, the servo processing circuit 11 makes the head 2
When the next servo sector number (SA1) is reproduced by
Further, the count data for generating the data sector pulse DSP necessary for the servo sector corresponding to the next servo sector number (SA2) is set in the second register group 41.

That is, at the initial position when the head 2 is positioned, the data sector pulse DSP of the servo sector corresponding to the first reproduced servo sector number is not generated, but the data sector pulse DSP of the servo sector corresponding to the next servo sector number is generated. Prepare to generate (first
Register group 40). Then, while the data sector pulse DSP corresponding to the prepared servo sector number is being generated, preparation is made for generating the data sector pulse DSP corresponding to the next servo sector number (second register group 41). Therefore, the count data prepared to generate the data sector pulse DSP corresponding to the next servo sector number is alternately stored in the first and second register groups 40 and 41.

Here, the table is set for each zone. If the zone number of the access target has been changed since the previous access, the base address is changed and the table to be referred to is changed (Y in step S2).
ES, S3).

After reproducing the servo sector number, the servo processing circuit 11 determines the reference position of the table based on the servo sector number (step S4). The reference position (address) of the table is obtained by, for example, “servo sector number × data length + base address”.

The data sector pulse circuit is constructed so that two types of timers operate, and is called a timer system A and a timer system B for convenience. This timer system A and timer system B
Do not operate at the same time, and when one is active, the other is ready to generate the next data sector pulse.

If the timer system A is not operating,
The servo processing circuit 11 sets the count data accessed from the table in the timer circuit 46 of the timer system A (NO in step S5, S8). The timer circuit 46 starts the timer operation based on the set count data and generates the data sector pulse DSP at a predetermined interval (step S9).

Next, the operation of the data sector pulse circuit will be specifically described with reference to FIGS. 4 and 5. When operating the timer system A, the control circuit 44 outputs the selection signal SEL to activate the first selector 42, and sets the count data stored in the first register group 40 in the timer circuit 46. . As described above, the initial value register 40a, the reload register 40b, and the reload count register 40c of the first register group 40 have counts corresponding to the next servo sector number (SA1) determined from the previous servo sector number (SA0). The data is set.

The control circuit 44 controls the servo sector pulse SS
In synchronization with the generation of P, the count enable CE is output to activate the timer circuit 46. At this time, the timer circuit 4
6, the data stored in the initial value register 40a is
It is set via the first selector 42 and the OR circuit 45. As shown in FIG. 5, the timer circuit 46 performs the count operation based on the data stored in the initial value register 40a, and at the interval corresponding to the position of the ID area of the data sector B from the time when the servo sector pulse SSP is generated. The sector pulse DSP1 is generated.

At the same time when the data sector pulse DSP is generated, the control circuit 44 sets the data stored in the reload register 40b in the timer circuit 46. As a result, the timer circuit 46 generates the data sector pulse DSP2 at an interval corresponding to the position of the ID area of the data sector C, as shown in FIG. Further, the timer circuit 46
Repeats the counting operation based on the data stored in the reload register 40b to generate the data sector pulses DSP3 having the same intervals. This data sector pulse D
SP3 is a sector pulse corresponding to the position of the ID area of the data sector D. In this case, the number of times the counting operation is repeated is set by the number of times data stored in the reload number register 40c.

During the operation of the timer system A, as shown in FIG.
As shown in steps S6 and S7, the preparation process for the timer system B is executed. That is, count data for generating the data sector pulse DSP corresponding to the next servo sector number (SA2) is set in the second register group 41.

When the timer circuit B is operated, the control circuit 44 outputs the selection signal SEL to output the second selector 4
3 is activated, and the data stored in the second register group 41 is set in the timer circuit 46. Similar to the timer system A, the timer circuit 46 of the timer system B starts the timer operation based on the data set from the second register group 41, and the predetermined predetermined value determined by the corresponding servo sector number (SA2). The data sector pulse DSP having the interval of is generated.

In this way, in each servo area,
A servo sector number (servo sector information) for identifying each servo sector is provided. The servo processing circuit 11 reproduces the servo sector number and searches the table corresponding to this servo sector number for count data for generating the data sector pulse DSP. The count data is data for generating the data sector pulse DSP according to the sector format of the data sector included in the servo sector designated by the servo sector number.

As a result, the data sector pulse circuit is
Based on the count data of the table set in the timer circuit 46, the data sector pulse DSP is generated at the timing corresponding to the position of the ID area of the data sector included in the servo sector corresponding to the servo sector number. With this data sector pulse DSP, the CPU 11
Reads the ID information from the ID area of each data sector and determines whether or not the data sector is an access target.

By the method of calculating the position of the ID area of each data sector from the position of the physical servo area on the disk 1 as described above, even if a situation where the servo sector pulse does not occur continuously occurs, The position of the ID area of each data sector can be reliably detected. Further, an area for recording the servo sector number is required, but it is not as large as the area for recording the conventional address mark, and therefore the data recording area does not decrease. Further, when the position where the servo data is recorded does not match between the front surface and the back surface of the disk 1 and the head switching operation is executed, the position of the ID area of each data sector is surely detected. be able to. (Second Embodiment) FIGS. 7 to 9 are views relating to a second embodiment of the present invention. The second embodiment relates to sector defect processing when a sector has a defect by using the sector pulse generation circuit (see FIG. 4) in the first embodiment. (Structure of Sector Pulse Generating Circuit) In the same embodiment, as shown in FIG. 7, the sector pulse generating circuit of the first embodiment has the first and second pulse number registers 50a and 50a.
b and the control circuit 51 are added. Control circuit 51
Is a circuit for removing the pulse corresponding to the defective sector from the data sector pulse DSP. The first and second pulse number registers 50a and 50b are registers for holding data for designating the data sector pulse DSP corresponding to the defective sector.

The control circuit 51 determines which one of the timer systems A and B of the sector pulse generating circuit (for convenience, is set in the first embodiment) based on the output signals S1 and S2 from the selectors 42 and 43. Recognize if it is working. The control circuit 51 counts the number of occurrences of the data sector pulse DSP output from the timer circuit 46 of the timer system A or B in synchronization with the servo sector pulse SSP or the servo index pulse SIP.

On the other hand, the pulse numbers of the data sector pulse DSP corresponding to the defective sector are set in the first and second pulse number registers 50a and 50b. CPU1
2 is based on the defect information from the HDC 13,
A corresponding pulse number (described later) is set in the first or second pulse number register 50a, 50b. (Defective Sector Processing) Here, in the conventional case, as shown in FIG.
There is a defective sector processing method in which the spare sector 91 is used as a substitute sector when 0 (sector of sector number 10) exists. Normally, a spare sector 91 for one sector is prepared for each track.

In this defective sector processing method, FIG.
As shown in, the sector number is rewritten to a sector number (X in this case) that does not exist in the ID area of the defective sector 90, and the sector number 10 is moved to the sector 92 of the next sector number 11, and then the sector numbers are sequentially transferred to the spare sector 91. The process (skip process) is executed. By such processing, the sector number X of the defective sector 90 does not match the sector number of the access target, so the defective sector 90 is not accessed.

In such a conventional method, the defective sector 90
If the ID area is defective, the rewriting process of the sector number X cannot be performed, and the skip process as described above cannot be performed. Further, in the sector configuration in which the ID area is deleted in order to increase the recording density, it is impossible to compare the sector numbers for identifying the defective sector 90, and thus the skip processing as described above is impossible.

Therefore, according to the present invention, the sector pulse generating circuit as shown in FIG. 7 prevents the generation of the data sector pulse DSP at the sector position corresponding to the defective sector. This enables skip processing for skipping a defective sector without comparing sector numbers. (Operation of Sector Pulse Generating Circuit) The operation of the second embodiment will be described below with reference to FIGS. 7 and 8.

As shown in FIG. 8, the servo sector SA1 on a certain track is the data sector A to D (however, the sector D
Sector B is assumed to be defective sector 90 in the case of a sector configuration composed of divided parts).

The HDC 13 stores the defect information necessary for designating the defective sector 90 and using the spare sector 91 as a substitute sector for the defective sector. C
Based on the defect information from the HDC 13, the PU 12 sets a pulse number for preventing the generation of the data sector pulse DSP at the position of the defective sector 90 (sector B) in the first or second pulse number register 50a, 50b. To do.

Here, the first and second pulse number registers 50a and 50b correspond to the timer systems A and B, respectively.
That is, the timer system A includes the first register group 40 and the selector 4
2 and a timer circuit 46. The timer system B is a circuit system including a second register group 41, a selector 43 and a timer circuit 46. Timer system A and timer system B
Do not operate at the same time, and when one is active, the other is ready to generate the next data sector pulse. Both the timer systems A and B have the head 2
With respect to the servo sector number reproduced by, the preparation for generating the data sector pulse DSP of the servo sector corresponding to the next servo sector number is performed.

Here, for convenience, the CPU 12 sets the pulse number (here, 2) corresponding to the defective sector 90 (sector B) in the first pulse number register 50a corresponding to the timer system A. The timer circuit 46 of the timer system A is
As shown in FIG. 8, at the timings corresponding to the respective head positions of the data sectors A to D, the data sector pulses DSP1 to DSP1
4 is output.

The control circuit 51 controls the servo sector pulse SS
In synchronization with the input of P (or SIP), the data sector pulses DSP1 to DSP4 from the timer circuit 46 are counted, and the content (2) of the first pulse number register 50a is subtracted according to the count. At this time, the control circuit 51 confirms the content of the first pulse number register 50a after the subtraction and detects whether it is "0".

Specifically, the first data sector pulse D
When SP1 is output, the first pulse number register 50
The content of a is “2-1 = 1”. Since the content of the first pulse number register 50a is not "0", the control circuit 51 outputs the data sector pulse DSP1 as a valid data sector pulse DSP. When the next data sector pulse DSP2 is output, the first pulse number register 5
The content of 0a is “1-1 = 0”. As a result, the control circuit 51 recognizes that the data sector pulse DSP2 is an invalid data sector pulse corresponding to the defective sector and blocks the output.

Therefore, as shown in FIG. 8, the data sector pulse DSP2 corresponding to the data sector B is not generated. The control circuit 51 uses the first pulse number register 50.
Once the content of a becomes “0”, the data sector pulses DSP3 to DSP4 input thereafter are output as valid data sector pulses DSP.

In this way, when the target data sector is accessed by the head 2, the generation of an effective data sector pulse DSP2 is blocked at the position of the defective sector 90 designated by the defect information. Therefore, sector B, which is defective sector 90, is skipped without being detected. Then, at the positions of the data sectors (C, D) other than the defective sector 90, the valid data sector pulses DSP3 to DSP4 are output, and the data sectors corresponding to the sectors C and D next to the sector A continue. Access is possible.

According to the method of the second embodiment, it is unnecessary to rewrite the sector number (X) which does not exist in the ID area of the defective sector 90. Therefore, even if there is a defect in the ID area, it is possible to realize skip processing for skipping the defective sector. Further, even in the case of the sector configuration in which the ID area is deleted, it is possible to similarly implement the skip processing of skipping the defective sector. (Third Embodiment) FIGS. 10 to 13 are views relating to a third embodiment of the present invention. The third embodiment uses the servo sector information (servo area number) in the first embodiment to generate a data sector pulse DPS necessary for accessing the target sector in the sector structure in which the ID area is deleted. Concerning the method to do.

The sector structure with the ID area deleted is shown in FIG.
As shown in 0, the PLL / SYNC area 14a and SY
The ID information other than the NC byte area 14b is deleted (see FIG. 24). The PLL / SYNC area 14a is an area for synchronizing the data discrimination window before reading the header portion 1a, and records a synchronization pattern of a predetermined frequency. The SYNC byte area 14b is the NRZ (non re input) that is input when the PLL / SYNC area 14a is synchronized.
The information for synchronizing the demodulation of the turn to zero code signal in byte units is recorded.

With the sector structure in which the ID information is deleted, the recording density of the disc 1 can be increased.
However, since the ID information such as the sector number does not exist, the head 2 cannot reproduce the ID information and determine whether or not the target sector is an access target. Therefore, in the present invention, the position of the target sector is determined based on the servo sector information recorded in the servo area, and the reference pulse PS corresponding to this position is generated for access. (Structure of Reference Pulse Generation Circuit) In the same embodiment, FIG.
As shown in (A), a circuit for generating a reference pulse PS for accessing the target sector is provided. The counter number register 60 stores the number of pulses corresponding to the target sector,
That is, the count value to be counted by the counter 61 is stored. The number of pulses to be stored is calculated by the CPU 12 and set in the counter number register 60.

The counter 61 operates or stops in response to the activation signal from the CPU 12, and the servo sector pulse SS
In synchronization with the input of P, the count operation of the data sector pulse DSP is started. When the counter 61 counts the data sector pulse DSP by the number of pulses set in the counter number register 60, the reference pulse P is one pulse.
The S is output to the HDC 13. The data sector pulse DSP is output from the data sector pulse generation circuit (see FIG. 4) in the first embodiment. (Target sector access operation) In the embodiment, the CPU 1
2 uses the table stored in advance in the ROM 14 to obtain the placement information of the target sector from the sector number of the target sector to be accessed (step S10 in FIG. 13).
The target sector layout information is an array address indicating the position of the target sector in the servo sector (servo area number) in which the target sector exists. Therefore, the ROM 14 stores a table including the servo area numbers corresponding to the sector numbers and the array addresses. Here, the sector number of the target sector to be accessed is output from the HDC 13.

The CPU 12 calculates the number of pulses from the arrangement information of the target sector and sets it in the counter number register 60 (step S11). Here, as shown in FIG. 12, the target sector TS is the second area of the servo area number SA1.
Assume that it is the th data sector.

The CPU 12 controls the positioning of the head 2 on the target track on which the target sector TS exists via the servo processing circuit 11. Based on the servo sector information reproduced by the head 2 (see FIG. 2), the CPU 12 causes the servo sector (servo area number SA
1) is detected (step S12). When the target servo area number SA1 is detected (YE in step S13)
S), the CPU 12 outputs a start signal to the counter 61 to make the counter 61 operable (step S1).
4).

Here, in actuality, when the CPU 12 detects the servo area number SA0 immediately before the target servo area number SA1, it prepares to output a start signal.
Further, the HDC 13 starts preparation for executing, for example, a read operation on the target sector in synchronization with the reference pulse PS output from the reference pulse generation circuit.

The counter 61 starts the counting operation of the data sector pulse DSP in synchronization with the input of the servo sector pulse SSP corresponding to the target servo area number SA1 (step S15). That is, as shown in FIG. 11B, the counter 61 sequentially counts the data sector pulses DSP1 to DSP3 corresponding to the servo area number SA1 in synchronization with the servo sector pulse SSP. When the counter 61 counts the data sector pulse DSP by the number of pulses (here, 2) set in the counter number register 60, the counter 61 outputs one pulse of the reference pulse PS (PS1) to the HDC 13 (step S16).

In response to the input of the reference pulse PS, the HDC 13 outputs the read gate RG to execute the read operation for the target sector, as shown in FIG. 12 (step S17). That is, the read data output from the read / write circuit system 3 is input as data from the target sector to be accessed at the timing of the read gate RG. The HDC 13 outputs the write gate in response to the input of the reference pulse PS when executing the write operation of writing the data in the target sector.

By the way, when a plurality of target sectors are continuously accessed, the counter 61 uses the data sector pulse DSP as a reference pulse because the next target sector is arranged continuously from the first target sector. Output to. That is, as shown in FIG. 11B, the counter 61 outputs the first reference pulse PS1 and then outputs the data sector pulse DSP3 as a reference pulse PS2 corresponding to the next target sector.

In this way, the target sector to be accessed is detected and the read / write operation is executed on the disk 1 having the sector structure in which the ID information is deleted, without the sector number being read by the head 2. You can (Fourth Embodiment) FIGS. 14 to 17 are diagrams relating to a fourth embodiment of the present invention. The fourth embodiment relates to a track skew method for minimizing the rotation waiting time of the disk 1 caused by the influence of the seek time of the head 2 and the head switching time when accessing the target sector.

In the HDD, when the target sector is continuously accessed over a plurality of tracks, the head 2
There is a track skew method in which the start sector of a track is delayed (skewed) in sector units in consideration of the seek time. In this method, the number of sectors corresponding to the seek time is calculated, and the position of the start sector is delayed from the reference signal (servo index pulse) by the number of sectors, which is a sector format.

In the present invention, the servo sector number (servo sector information) is recorded in order from the reference signal in each servo area for each track. As shown in FIG. 14, as shown in FIG. 14, the radial direction of the disk 1 (the seek direction of the head 2). ), The same servo sector number is recorded at the same position. When the track skew method is applied to the sector format of the present invention, the sector arrangement is delayed for each servo area number.

Specifically, as shown in FIG. 14, in the track (1) with respect to the track (0), the data sector (0) of the servo area number (1) is the start sector and the servo area number ( The last data sector of 0) is the last sector of the track. In the track (2), the track skew is set so that the data sector (0) of the servo area number (2) becomes the start sector.

Now, assume that the head 2 seeks from the track (1) to the track (2) to perform a data read operation. When the head 2 finishes the read operation of the last sector of the track (1), the seek operation to the track (2) is started.

That is, as shown in step S20 of FIG. 16, when the target address to be accessed is output from the HDC 13, the CPU 12 executes the positioning control for positioning the head 2 on the track (2) which is the target track ( Step S22). The target address is a physical address of a track (cylinder) number, a sector number, a head number, and a servo area number.

Here, depending on the relationship between the seek time of the head 2 and the rotation speed of the disk 1, in order to minimize the disk rotation waiting time, as shown in FIG. Track skew is applied to the sector structure of (2). That is, the sector configuration is such that the last sector of track (1) is continuously accessed from the start sector (sector 0) of track (2).
Therefore, the HDC 13 calculates the servo area number (here, 2) in consideration of the rotation waiting time of the disk in order to access the start sector of the track (2), and performs the process of converting the target servo area number ( Step S21).

Head 2 positioned on track (2)
When the target servo area number (2) is searched by,
The HDC 13 executes a read operation for reading data from the target sector (start sector 0) (steps S23, S).
24, S25). Then, when the last sector of the track (2) is accessed, the target track number is incremented to access the next target track (steps S26 and S27). Here, if the access to the final sector is not completed within a certain time (corresponding to the rotation time of the disk 1), it is determined that an error has occurred, and a predetermined error process is executed (step S26). NO, S28, S29).

In this way, the track skew method can be applied to the present invention by the sector configuration in which the sector arrangement is delayed for each servo area number. But,
In the above method, since the same servo area number is recorded at the same position in the radial direction of each track, the servo area number in which the start sector is arranged is different for each track. For this reason, as described above, the servo area number conversion process for obtaining the target servo area number is required each time the seek operation of the head 2 is performed (step S2).
1). If this conversion processing time is long, it will affect the access time of the target sector. (Modification of Fourth Embodiment) Therefore, a modification in which the conversion processing of the servo area number can be omitted will be described with reference to FIGS.
Will be described with reference to.

In this modified example, as shown in FIG. 15, in the continuous tracks (0), (1) and (2), the stroke (S1,
The same servo area number is recorded at a position considering the time of the track change which is S2). Further, similar to the sector structure of FIG. 14, due to the relationship between the seek time of the head 2 and the rotation speed of the disk 1, the sector structure has a track skew in order to minimize the rotation waiting time of the disk. ing.

In such a sector structure, it is assumed that the head 2 seeks from the track (1) to the track (2) to continuously perform the data read operation, as described above. First, when the head 2 finishes the read operation of the last sector of the track (1), the seek operation to the track (2) is started.

That is, as shown in step S30 of FIG. 17, when the target address to be accessed is output from the HDC 13, the CPU 12 executes the positioning control for positioning the head 2 on the target track (2) ( Step S31).

Here, in order to minimize the disk rotation waiting time by the relationship between the seek time of the head 2 and the rotation speed of the disk 1, as shown in FIG. Track skew is applied to the sector structure of (2). That is, the sector configuration is such that the last sector of track (1) is continuously accessed from the start sector (sector 0) of track (2).

In order to access the start sector (sector 0) of this track (2), the head 2 positioned on the track (2) searches for the servo area number (0) (step S32). At this time, since the servo area number (0) of the track (2) is recorded at a position in consideration of the track skew as shown in FIG. 15, the head 2 searches without waiting for the rotation of the disk. Will be done. In other words, since the servo area number (0 in this case) in which the start sector is arranged is the same for each track, the target servo area number is obtained each time the seek operation of the head 2 is performed as in the above-described embodiment. It is not necessary to perform the conversion processing of the servo area number.

When the target servo area number (0) is retrieved, the HDC 13 executes a read operation for reading data from the target sector (start sector 0) (step S3).
3, S34). When the last sector of the track (2) is accessed, the target track number is incremented to access the next target track (steps S35 and S36). Here, for a certain time (disk 1
If the access to the last sector is not completed by the elapse of (corresponding to the rotation time), it is determined that an error has occurred, and a predetermined error process is executed (NO in step S35, S37, S38).

In this way, by considering the track skew and setting the recording position of the servo area number in consideration of the track skew as well as the sector structure for delaying the sector arrangement in units of the servo area number, The track skew method can be realized without the need for conversion processing. Therefore, by eliminating the servo area number conversion processing time in the above embodiment, the access time of the target sector can be shortened.

[0108]

As described in detail above, according to the present invention, first, an address mark is recorded on a disk by a method of identifying a data sector included in a servo area based on servo sector information recorded in the servo area. The head position of the data sector can be accurately detected without providing a specific area. Secondly, by the method of identifying the data sector included in the servo area by the servo sector information recorded in the servo area, even if the ID information of the ID area is reduced from each data sector area, the head position of the data sector is accurately detected. In addition, the data sector to be accessed can be accurately identified. Thirdly, by the method of identifying the data sector included in the servo area by the servo sector information recorded in the servo area, the defect processing for the defective sector can be surely realized even when the ID information of the ID area is reduced. Fourth
In addition, by making the data sector included in the servo area a sector structure to which the track skew method is applied, it is possible to shorten the access time in the track skew method. Further, by applying the track skew method to the servo sector information recorded in the servo area, it is possible to further shorten the access time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a hard disk device (HDD) according to the first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a format of a servo area according to the first embodiment.

FIG. 3 is a conceptual diagram showing a format of a servo area according to the first embodiment.

FIG. 4 is a block diagram showing a configuration of a data sector pulse generation circuit according to the first embodiment.

FIG. 5 is a timing chart for explaining the operation of the data sector pulse generation circuit according to the first embodiment.

FIG. 6 is a flowchart for explaining the operation of the first embodiment.

FIG. 7 is a block diagram showing a configuration of a data sector pulse generation circuit according to a second embodiment of the present invention.

FIG. 8 is a timing chart for explaining the operation of the data sector pulse generation circuit according to the second embodiment.

FIG. 9 is a conceptual diagram for explaining the configuration of a data sector according to the second embodiment.

FIG. 10 is a conceptual diagram showing a format of a data area according to the third embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of a pulse generation circuit according to a third embodiment.

FIG. 12 is a timing chart for explaining the operation of the third embodiment.

FIG. 13 is a flowchart for explaining the operation of the third embodiment.

FIG. 14 is a conceptual diagram for explaining a sector configuration according to a fourth embodiment of the present invention.

FIG. 15 is a conceptual diagram for explaining a sector configuration according to the fourth embodiment.

FIG. 16 is a flowchart for explaining the operation of the fourth embodiment.

FIG. 17 is a flowchart for explaining the operation of the fourth embodiment.

FIG. 18 is a conceptual diagram for explaining a conventional head switching operation.

FIG. 19 is a conceptual diagram for explaining the configuration of a conventional servo area.

FIG. 20 is a signal waveform diagram for explaining a conventional data reproducing operation.

FIG. 21 is a conceptual diagram for explaining a conventional CDR disc format.

FIG. 22 is a conceptual diagram for explaining the configuration of a conventional servo area.

FIG. 23 is a conceptual diagram for explaining a conventional CDR disc format.

FIG. 24 is a conceptual diagram for explaining the configuration of a conventional ID area.

FIG. 25 is a conceptual diagram for explaining the configuration of a conventional servo area.

FIG. 26 is a conceptual diagram for explaining a conventional disc format.

[Explanation of symbols]

1 ... Disk, 2 ... Head, 3 ... Read / write circuit system, 11 ... Servo processing circuit, 12 ... CPU, 13 ... HD
C, 15 ... Host system.

Claims (19)

[Claims] 1. A head for recording / reproducing data, and a plurality of areas arranged at predetermined intervals on a track formed on a disk surface for recording the data, the head being located at a designated track position. A disk having a plurality of servo areas in which servo data for positioning control and servo sector information for identifying each area are recorded, and a predetermined number of data sectors are formed between the servo areas; A data recording / reproducing apparatus comprising: data sector identification means for identifying the data sector for recording / reproducing data by the head based on the servo sector information reproduced from the disk by the head. 2. A head for recording / reproducing data, and a plurality of areas arranged at predetermined intervals on a track formed on a disk surface for recording the data, the head being located at a designated track position. A disk having a plurality of servo areas in which servo data for positioning control and servo sector information for identifying each area are recorded, and a predetermined number of data sectors are formed between the servo areas; A data recording / reproducing apparatus comprising: a detecting unit that detects each of the data sectors corresponding to the servo area based on the servo sector information reproduced from the disk by the head. 3. A head for recording / reproducing data, and a plurality of areas arranged at predetermined intervals on tracks formed on a disk surface for recording the data, the head being located at a designated track position. A disk having a plurality of servo areas in which servo data for positioning control and servo sector information for identifying each area are recorded, and a predetermined number of data sectors are formed between the servo areas; A data recording / reproducing apparatus comprising: a determining unit that determines a head position of each data sector corresponding to the servo area based on the servo sector information reproduced from the disk by the head. 4. A head for recording / reproducing data, and a plurality of areas arranged at predetermined intervals on a track formed on a disk surface for recording the data, the head being located at a designated track position. A disk having a plurality of servo areas in which servo data for positioning control and servo sector information for identifying each area are recorded, and a predetermined number of data sectors are formed between the servo areas; Determining means for determining the head position of each data sector corresponding to the servo area based on the servo sector information reproduced from the disk by the head, and the head position of the data sector determined by the determining means. And a sector pulse generating means for generating a data sector pulse at a predetermined timing. Characteristic data recording / reproducing apparatus. 5. A head for recording / reproducing data, and a plurality of areas arranged at predetermined intervals on a track formed on a disk surface for recording the data, the head being located at a designated track position. A disk having a plurality of servo areas in which servo data for positioning control and servo sector information for identifying each area are recorded, and a predetermined number of data sectors are formed between the servo areas; Table means storing format information indicating the format contents of the data sector corresponding to each servo area, and the format information corresponding to the servo sector information reproduced from the disk by the head from the table means, and the format information Each corresponding to the servo area based on A data recording / reproducing apparatus comprising: a detecting unit for detecting a data sector. 6. A head for recording / reproducing data, and a plurality of areas arranged at predetermined intervals on tracks formed on a disk surface for recording the data, the head being located at a designated track position. A disk having a plurality of servo areas in which servo data for positioning control and servo sector information for identifying each area are recorded, and a predetermined number of data sectors are formed between the servo areas; Based on the format contents of the data sector corresponding to each servo area, it comprises count data for generating a data sector pulse at a timing corresponding to the head position of each data sector, and the count data is generated based on the servo sector information. Table means configured to search, and positioned at the designated track position Count data for storing the count data retrieved from the table means in preparation for generating a data sector pulse corresponding to the next servo sector information based on the servo sector information reproduced from the disk by the arranged head. Storage means, and sector pulse generation means for generating a data sector pulse at a timing corresponding to a head position of the data sector corresponding to the next servo sector information based on the count data stored in the count data storage means. A data recording / reproducing apparatus comprising: 7. A head for recording / reproducing data, and a CDR system which is divided into a plurality of zones in a radial direction, and each zone includes a plurality of tracks, wherein the zone extends in the radial direction. Of the servo areas which are arranged in the same direction, and servo data for positioning control of the head at a designated track position and servo sector information for identifying each area are recorded at predetermined intervals in the circumferential direction. Has multiple servo areas,
A disk in which a predetermined number of data sectors are formed between the servo areas, table means for storing format information indicating the format contents of the data sectors corresponding to the servo areas for each zone, and the head for storing the format information. And a detecting means for reading the format information corresponding to the servo sector information reproduced from the disc from the table means and detecting each data sector corresponding to the servo area for each zone based on the format information. A data recording / reproducing device characterized by the above. 8. A CDR system in which a head for recording / reproducing data and a plurality of zones are divided in a radial direction, and each zone includes a plurality of tracks. Servo areas that are arranged in the same manner, and servo data for positioning control of the head at a designated track position and servo sector information for identifying each area are recorded at predetermined intervals in the circumferential direction. A disk having a plurality of servo areas, in which a predetermined number of data sectors are formed between the servo areas, and format information indicating the format contents of the data sectors corresponding to the servo areas for each zone. Table means stored, and the former corresponding to the servo sector information reproduced from the disk by the head Read out from the table means and determine the head position of each data sector corresponding to the servo area for each zone based on the format information; and the data determined by this determining means. A data recording / reproducing apparatus comprising: sector pulse generating means for generating a data sector pulse at a timing corresponding to a head position of a sector. 9. A head for recording / reproducing data, and a plurality of areas arranged at predetermined intervals on a track formed on a disk surface for recording the data, the head being located at a designated track position. A disk having a plurality of servo areas in which servo data for positioning control and servo sector information for identifying each area are recorded, and a predetermined number of data sectors are formed between each servo area is provided. In the data recording / reproducing apparatus, a step of determining a head position of each of the data sectors corresponding to the servo area identified based on the servo sector information reproduced from the disk by the head; For example, a step of generating a data sector pulse at a timing according to the start position Servo processing method characterized by comprising. 10. A CDR system in which a head for recording / reproducing data and a plurality of zones are divided in a radial direction, and each zone includes a plurality of tracks. Servo areas that are arranged in the same manner, and servo data for positioning control of the head at a designated track position and servo sector information for identifying each area are recorded at predetermined intervals in the circumferential direction. Have multiple servo areas,
In a data recording / reproducing apparatus provided with a disk having a predetermined number of data sectors formed between the servo areas, a table storing format information indicating the format contents of the data sectors corresponding to the servo areas for each zone. Means for reading the format information corresponding to the servo sector information reproduced from the disk by the head from the table means, and the servo area for each zone based on the read format information. And a step of generating a data sector pulse at a timing corresponding to the determined start position of the data sector, the servo processing method. 11. A head for recording / reproducing data, and a plurality of areas arranged at predetermined intervals on a track formed on a disk surface for recording the data, the head being located at a designated track position. A disk having a plurality of servo areas in which servo data for positioning control and servo sector information for identifying each area are recorded, and a predetermined number of data sectors are formed between the servo areas; Determining means for determining the starting position of each data sector corresponding to the servo area identified based on the servo sector information reproduced from the disk by the head, and the starting position of the data sector determined by this determining means Sector pulse generating means for generating a data sector pulse at a timing according to Defect information storage means storing defect information indicating a defective sector in which data cannot be recorded, and the data sector pulse corresponding to the servo area having the defective sector is generated based on the defect information. At this time, the data recording is characterized by comprising control means for controlling the sector pulse generating means so as to generate the data sector pulse at a timing according to the head position of each data sector excluding the defective sector. Playback device. 12. A head for recording / reproducing data, and a plurality of areas arranged at predetermined intervals on a track formed on a disk surface for recording the data, the head being located at a designated track position. A disk having a plurality of servo areas in which servo data for positioning control and servo sector information for identifying each area are recorded, and a predetermined number of data sectors are formed between the servo areas; Determining means for determining the starting position of each data sector corresponding to the servo area identified based on the servo sector information reproduced from the disk by the head, and the starting position of the data sector determined by this determining means Sector pulse generating means for generating a data sector pulse at a timing according to Defect information storage means storing defect information indicating a defective sector in which data cannot be recorded, and the data sector pulse corresponding to the servo area having the defective sector is generated based on the defect information. When the data sector pulse is generated at a timing corresponding to the head position of each data sector excluding the defective sector, and the data sector pulse corresponding to the servo area including a spare sector prepared in advance is generated. And a control means for controlling the sector pulse generating means so as to generate the data sector pulse at a timing corresponding to the head position of the spare sector as a data sector for replacing the defective sector. Data recording / reproducing device. 13. A head for recording and reproducing data, and a plurality of areas arranged at predetermined intervals on a track formed on a disk surface for recording the data, the head being located at a designated track position. A disk having a plurality of servo areas in which servo data for positioning control and servo sector information for identifying each area are recorded, and a predetermined number of data sectors are formed between each servo area is provided. In the data recording / reproducing apparatus, a step of determining a head position of each of the data sectors corresponding to the servo area identified based on the servo sector information reproduced from the disk by the head; When the data sector pulse is generated at the timing according to A step of generating the data sector pulse at a timing corresponding to the head position of each of the data sectors excluding the defective sector, based on the defect information indicating a defective sector in which data cannot be recorded in the data sector. When generating the data sector pulse corresponding to the servo area including a spare sector, generating the data sector pulse at a timing according to the head position of the spare sector as a data sector for replacing the defective sector. And a servo processing method. 14. A head for recording / reproducing data and a plurality of servo areas in which servo sector information for identifying areas is recorded, and a predetermined number of data sectors are arranged between the servo areas. Depending on the sector configuration disk and the sector number of the target data sector to be accessed,
A means for obtaining arrangement information composed of a position of the servo area corresponding to the target data sector and the servo sector information, and a head position of each data sector corresponding to the servo area identified based on the servo sector information. Sector pulse generating means for generating a data sector pulse at a timing; and detecting the data sector pulse corresponding to the head position of the target data sector based on the arrangement information and synchronizing with the detected data sector pulse. A reference pulse generating means for generating a reference pulse necessary for accessing the target data sector; and an access executing means for executing a data read / write operation on the target data sector in synchronization with the reference pulse. A data recording / reproducing apparatus characterized by: 15. A head for recording / reproducing data and a plurality of servo areas in which servo sector information for identifying areas is recorded, and a predetermined number of data sectors are arranged between the servo areas. Depending on the sector configuration disk and the sector number of the target data sector to be accessed,
A means for obtaining arrangement information composed of a position of the servo area corresponding to the target data sector and the servo sector information, and a head position of each data sector corresponding to the servo area identified based on the servo sector information. Sector pulse generating means for generating a data sector pulse at a timing; calculating means for calculating the pulse number of the data sector pulse corresponding to the position of the target data sector based on the arrangement information; and corresponding to the target data sector. When the counting operation of the data sector pulse is started in synchronization with the detection of the servo sector information of the servo area and the number of pulses corresponding to the target data sector is counted, a reference necessary for accessing the target data sector. A reference pulse generating means for outputting a pulse, and A data recording / reproducing apparatus comprising: an access executing unit that executes a data read / write operation with respect to the target data sector in synchronization with a reference pulse. 16. A plurality of servo areas in which servo sector information for identifying a head and an area for recording / reproducing data is recorded, and a predetermined number of data sectors are arranged between the servo areas. In a data recording / reproducing apparatus equipped with a sector-structured disk, depending on the sector number of the target data sector to be accessed,
A step of obtaining arrangement information composed of a position of the servo area corresponding to the target data sector and the servo sector information; and a step of determining a position of the head of each data sector corresponding to the servo area identified based on the servo sector information. Generating a data sector pulse at a timing; calculating a pulse number of the data sector pulse corresponding to the position of the target data sector based on the arrangement information; and a servo area corresponding to the target data sector. The counting operation of the data sector pulse is started in synchronization with the detection of the servo sector information, and when the number of pulses corresponding to the target data sector is counted, a reference pulse necessary for accessing the target data sector is output. Characterized by consisting of steps and Target sector access method. 17. A head for recording / reproducing data and a plurality of servo areas in which servo sector information for identifying areas is recorded, and a predetermined number of data sectors are arranged between the servo areas. A disk having a sector configuration in consideration of track skew, and a detecting means for detecting the specified data sector based on the servo sector information when recording / reproducing data to / from the specified data sector at a specified track position by the head. And when the recording / reproducing is performed on the specified data sector corresponding to continuous data over a plurality of adjacent tracks, the servo sector information of the track to be moved by the head is converted in consideration of the track skew. A data recording / reproducing apparatus comprising: servo sector information converting means. 18. A plurality of servo areas in which servo sector information for identifying a head and an area for recording / reproducing data is recorded, and a predetermined number of data sectors are arranged between the servo areas. A data recording / reproducing apparatus having a disk having a sector structure, wherein the servo sector information considering track skew is recorded in each servo area, and each data sector corresponding to each servo sector information considers track skew. A data recording / reproducing apparatus comprising a disk having a sector structure arranged at a position. 19. A head for recording / reproducing data and a plurality of servo areas in which servo sector information for identifying areas is recorded, and a predetermined number of data sectors are arranged between the servo areas. , A sector structure considering track skew, wherein the servo sector information considering track skew is recorded in each servo area, and data is recorded by the head in a designated data sector at a designated track position. Detecting means for detecting the specified data sector based on the servo sector information when executing reproduction, and recording / reproducing executing means for executing recording / reproduction of data by the head on the specified data sector detected by the detecting means. A data recording / reproducing apparatus comprising: