JPH08138336A - Servo data writing controller and control method - Google Patents

Abstract

PURPOSE: To start the actual operation without causing a long waiting time when a servo data is written or verified. CONSTITUTION: An address generation circuit 24 counts master clocks divided by the number of blocks per single revolution to generate a memory address and a block address and processes a basic servo data of block unit, stored in a servo data storing/generating circuit 25, according to processing information corresponding to the block address. Upon receiving a write instruction from a servo write control section 21, a single track counter 26 counts the number of blocks per single revolution. During the interval for starting/ending the count operation, a write control circuit 27 transfers the servo data, processed through the servo data storing/generating circuit 25, sequentially to an HDD 22 in synchronism with a block pulse and writes the servo data on an objective track of a magnetic disc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a servo data write control device and write control method for a magnetic disk mounted on a magnetic disk device or the like.

[0002]

2. Description of the Related Art In general, a magnetic disk mounted in a magnetic disk device writes / writes data with a magnetic head.
In order to define the read position, servo data is recorded in advance at predetermined positions in the radial direction and the circumferential direction of the magnetic disk.

For example, in a sector servo type magnetic disk device, a plurality of servo areas SA and a data area DA are provided for each of a plurality of tracks which are sequentially arranged in an annular shape from the inner circumference to the outer circumference of the magnetic disk. They are arranged alternately in the circumferential direction.

FIG. 3 is a diagram showing the structure of in-track servo sectors in a sector servo type magnetic disk. A plurality of sectors SS0, SS1, SS2, ..., SSn are assigned to each track of the magnetic disk, and each sector SS0, SS1, SS2,
, SSn are composed of a servo area SA and a data area DA.

Servo data for positioning the magnetic head on the magnetic disk is recorded in the servo area SA. Based on the servo data recorded in the servo area SA, the magnetic head is recorded in a target sector. By moving and locating, the data can be written / read to / from the data area DA in the sector SS.

FIG. 4 is a diagram showing the structure of servo data SD in a certain servo area SA on the magnetic disk. Servo data SD includes front data 11a and address data 11
b, position error data 11c.

A signal indicating the start of servo data and a signal for the servo data reproducing circuit of the magnetic disk device to synchronize with the servo data are recorded in the prefix data 11a. The prefix signal is the same for each sector. Pattern.

In the address data 11b, a signal indicating that it is the first sector or not, and a signal indicating the sector number or the track number are recorded, and it is the first sector or the first sector. The signal indicating that the sector number and the signal indicating the sector number are different signals for each sector.

In the position error data 11c, a position error detection signal for recognizing the displacement amount and the displacement direction of the magnetic head from the track center and holding the magnetic head at the track center is recorded. The data 11c has the same signal pattern for each sector.

Then, the servo data SD as described above
Is recorded on a magnetic disk by using a servo data writer (servo track writer). In this case, the servo data writer is 1
The servo data SD is allocated and recorded as servo data SD0 to SDn for each sector on the basis of a master index which is a starting point of rotation and a master clock which is a large number of signals equally spaced between the master indexes.

FIG. 5 is a timing chart showing a writing operation of servo data SD by a conventional servo data writing device. That is, in the conventional servo data writing device, the servo data SD for one track is based on the master index that is the starting point of one rotation of the magnetic disk.
0 to SDn are sequentially and continuously written. In this case, the servo data SD0 to S for one track in which the address data 11b is made to correspond to the required number of sectors in a one-to-one correspondence.
Servo data SD0 to SDn are written to the magnetic disk by storing Dn in a rewritable memory in advance and sequentially addressing and reading it in synchronization with the master clock.

Here, among the address data of each of the servo data SD0 to SDn stored in advance in the memory, data different for each track is predetermined for each writing process of the servo data for a predetermined track in the servo data writing device. The entire track can be rewritten.

In the servo data writing device,
After the writing process of the servo data to the magnetic disk, a verify process is executed to inspect whether the servo data is correctly recorded. Even in this verify process, the master process is performed in the same manner as the write process. Servo data SD0 to S for one track from each of the magnetic disk and the memory based on the index
Dn are sequentially read out, and their respective servo data SD0
.About.SDn are compared and judged.

Therefore, in the conventional servo data writing device, the master index is recognized and the actual operation is started and the next master index is recognized in both the servo data writing process and the verifying process. Then the actual operation is completed.

Further, in the above-mentioned conventional servo data writing device, a memory capable of rewriting servo data SD0 to SDn for one track in which the address data 11b is made to correspond to the required number of sectors in a one-to-one correspondence. Stored in the memory, and the servo data SD0 to
Data different from track to track among the SDn address data are collectively rewritten for a predetermined number of tracks each time a servo data writing process for a predetermined number of tracks in the servo data writing device is performed.

[0016]

However, in the conventional servo data writing device, the servo data writing process or the verifying process is performed in track units on the basis of the master index which is the starting point of one rotation. After the servo data write command and verify command are given from the controller of the data writer,
It waits until the master index is recognized and does not actually operate. For example, when the write command or verify command is given immediately after the master index is recognized, the next master index is recognized and the actual operation is started. Until then, there is a problem that a long waiting time of about one rotation occurs.

Further, in the servo data writing process, the servo data which is the source of the writing, and in the verifying process, the servo data which is the reference for comparison are written in a rewritable memory in units of one track. Since the servo data SD0 to SDn are stored, a memory having a relatively large storage capacity is required, and when the write target track or the verify target track is switched, rewriting of different data among the address data 11b for each track. There was a problem that took a long time.

The present invention has been made in view of the above problems, and it becomes possible to start an actual operation without causing a long waiting time when performing a servo data write process or a verify process. Servo data write control device and write control that can significantly reduce the memory storage capacity and rewrite time of the servo data stored in the memory without having to store servo data in track units The purpose is to provide a method.

[0019]

That is, a first servo data write control device according to the present invention uses a master index per rotation and a preset number of master clocks to write to a magnetic disk. A servo data write control device for writing or verifying servo data, wherein the master clock is counted by a number obtained by dividing the master clock by the number of blocks per rotation of the magnetic disk. First counter means for generating each start point signal;
The start point signal for each block obtained by the first counter means should be written in the magnetic disk and second counter means for counting the number of blocks per one rotation of the magnetic disk to recognize one rotation of the magnetic disk. The servo data storage means for storing servo data in units of blocks, and the magnetic data by the servo data stored in the servo data storage means in synchronization with a start point signal for each block generated by the first counter means. Write / verify control means for starting the writing or verifying of the servo data to the disk and ending the writing or verifying of the servo data for the magnetic disk when the one rotation of the magnetic disk is recognized by the second counter means. It is configured with.

The second servo data write controller according to the present invention writes servo data to a magnetic disk by using one master index per one rotation and a preset number of master clocks. Alternatively, in a servo data write control device for verifying, the master clock is counted by a number obtained by dividing the master clock by the number of blocks per one rotation of the magnetic disk to generate a start point signal for each block. And a second counter means for recognizing one rotation of the magnetic disk by counting the start point signal for each block obtained by the first counter means for the number of blocks per one rotation of the magnetic disk. , The master point is used for the start point signal for each block obtained by the first counter means. Second counter means for obtaining a block address based on the master index by counting with reference to the master index, and servo data to be written to the magnetic disk in one block unit, and the third counter. Means for reading and processing the contents corresponding to the block address obtained by the means, and the servo data memory generator for synchronizing with the start point signal for each block generated by the first counter means. Writing or verifying of the servo data to the magnetic disk is started by the generated servo data, and writing or verifying of the servo data to the magnetic disk is performed when one rotation of the magnetic disk is recognized by the second counter means. Write / Verify to end It is constructed by a Lee control means.

A third servo data write control device according to the present invention is the first or second servo data write control device, further comprising: a first counter means and a second counter means. All of them are configured using a programmable counter.

A fourth servo data write control device according to the present invention is the second servo data write control device, and in the servo data storage generation means thereof,
When processing the content of the servo data in block units to be written to the magnetic disk in correspondence with the block address obtained by the third counter means, storing and reproducing the processing information corresponding to the block address in a rewritable memory. Thus, the correspondence between the block address and the content to be processed is configured as programmable.

[0023]

That is, in the first servo data write control device, the servo data stored in the servo data storage means in units of blocks is synchronized with the start point signal for each block generated by the first counter means. Since the writing or verifying of the servo data to the magnetic disk is started by the data, and the writing or the verifying of the servo data to the magnetic disk is completed when the second counter means recognizes one rotation of the magnetic disk. Even after waiting for the master index after the servo data writing or verifying command, the servo data writing or verifying for one rotation of the magnetic disk is started from the time when the starting point signal for each block is first generated.

In the second servo data write control device, the address data in the servo data stored in block units is different for each block, corresponding to the block address obtained by the third counter means. The data is processed and generated, and writing or verification of the servo data to the magnetic disk is started by the generated servo data in synchronization with the block signal generated by the first counter means. When the one rotation of the magnetic disk is recognized by the counter means, the writing or verification of the servo data to the magnetic disk is completed, so the magnetic disk 1
The servo data for one rotation of the magnetic disk can be written or verified from the time when the first block signal is generated without storing all the servo data for the rotation or waiting for the master index after writing or verifying the servo data. Will be started.

Further, in the third servo data write controller, in the first or second servo data write controller, both the first counter means and the second counter means are programmable. Since the counter is configured using a counter, the count set value in each counter means can be arbitrarily set according to the number of master clocks and the number of blocks per one rotation of the magnetic disk.

Further, in the fourth servo data write control device, in the second servo data write control device, the servo data storage generation means stores the data in units of blocks to be written on the magnetic disk. When the data different for each block among the address data in the servo data is processed corresponding to the block address generated by the third counter means, the processing information corresponding to the block address is stored in the rewritable memory. Therefore, it is possible to arbitrarily set the correspondence between the block address and the address data in the servo data, which is different for each block.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a servo data write control device. The servo data writing control device includes a servo write control unit 21.

The servo write control unit 21 controls the operation of each part of the circuit in accordance with a servo data writing program or a verify program stored in advance and executes a servo data writing process or a verify process. The part 21 includes a magnetic disk device (HDD) 22 and a master clock reproducing circuit 2
3, an address generation circuit 24, a servo data storage generation circuit 25, a 1-track counter 26, and a write / verify control circuit 27 are connected.

The magnetic disk device 22 includes a magnetic disk (not shown), a spindle motor mechanism for rotating the magnetic disk at a constant speed, a magnetic head for writing / reading data to / from the magnetic disk, and the magnetic head. A carriage mechanism or the like for moving and positioning in the radial direction on the magnetic disk is provided, and data writing or reading operation is performed at a designated position on the magnetic disk designated by a control signal from the servo write control unit 21. The master clock is recorded in advance on the magnetic disk as a signal serving as a starting point of one rotation of the magnetic disk and as a large number of signals equally spaced between the master indexes.

The master clock reproducing circuit 23 is a clock head 23a attached to the magnetic disk device 22.
The master index and master clock pulse signals recorded in advance on the magnetic disk are read out and reproduced by the magnetic disk, and correspond to the master index and master clock reproduced by the master clock reproducing circuit 23. The pulse signal is supplied to the servo write control unit 21 and the address generation circuit 24.

The memory address counter in the address generation circuit 24 is constructed by using a programmable counter, and the master clock supplied from the master clock reproduction circuit 23 is based on the master index supplied from the master clock reproduction circuit 23. Then, the number of master clocks per one rotation of the magnetic disk is
By repeatedly counting by the number of master clocks per block divided by the number of blocks per rotation, a block pulse signal indicating the starting point of each block is generated, and a block address counter, a 1-track counter 26, and Write / verify control circuit 27
Supply to.

The memory address counter uses the count value itself as the SRA in the servo data generating circuit 25.
It is supplied to M1 as a memory address. The block address counter in the address generation circuit 24 is supplied with the master index and the block pulse, and sequentially generates block addresses whose starting point block is “0” when the master index is supplied, and stores the servo data. It is supplied as a memory address to the SRAM 2 in the generation circuit 25.

The 1-track counter 26 is composed of a programmable counter, and when the servo data write or verify command is given in the control signal from the servo write controller 21, the write / verify control circuit 27 is provided. In response to this instruction, counting of the block pulse signal supplied from the address generation circuit 24 is started, and the number of blocks per one rotation of the magnetic disk (one track) is counted.
Count data from the track counter 26 is supplied to the write / verify control circuit 27.

SRA in the servo data generation circuit 25
M1 is the basic servo data S per block
D (see FIG. 4) is stored, which is read according to the memory address supplied from the address generation circuit 24 and supplied to the processing circuit in the servo data generation circuit 25.

SRA in the servo data generation circuit 25
M2 stores the processing information of the servo data to be processed corresponding to the block address, is read according to the block address supplied from the address generation circuit 24, and is supplied to the processing circuit in the servo data generation circuit 25. .

This processing circuit processes the servo data data supplied from the SRAM 1 according to the processing information corresponding to the block address supplied from the SRAM 2, and then supplies it to the write / verify control circuit 27.

The write / verify control circuit 27 is
When a servo data write command is given in the control signal from the servo write control section 21, the block pulse generated by the address generation circuit 24 is recognized immediately after that and a count instruction is given to the 1-track counter 26. During the period in which the count data from the 1-track counter 26 counts the number of blocks for one rotation, the block-based servo data supplied from the servo-data storage / generation circuit 25 is transferred to the block from the address generation circuit 24. The data is supplied as write data (WRITE DATA) to the magnetic disk device 22 in synchronization with the pulse. In this case, in the magnetic disk device 22, the one track counter 26 counts the number of blocks for one rotation. At the write gate signal (WRITE GATE) , It is set to a write state of the servo data.

Further, the write / verify control circuit 2
Numeral 7 indicates that when a servo data verify command is given in the control signal from the servo write controller 21,
Immediately after that, the block pulse generated by the address generation circuit 24 is recognized, a count instruction is given to the 1-track counter 26, and the count data from the 1-track counter 26 is counted in a period for counting the number of blocks for one rotation. , The servo data in block units supplied from the servo data storage generation circuit 25 is synchronized with the block pulse from the address generation circuit 24,
This is to be compared with the servo data (READ DATA) read from the hard disk device 22.

When the write / verify control circuit 27 receives the maximum value signal of the 1-track counter 26, it instructs the 1-track counter 26 to end the counting operation.

Next, the operation of the servo data writing control device having the above-mentioned configuration will be described. FIG. 2 is a timing chart showing a servo data write operation in the write control device.

In the present embodiment, the magnetic disk device 22
The number of blocks per rotation for the magnetic disk provided in the magnetic disk is “50”, and the number of master clocks between the master indexes recorded in advance on the magnetic disk is “1”.
The number of master clocks per block is "200" (= 10,000 / 50).

Therefore, the memory address counter in the address generation circuit 24 is an 8-bit counter, receives the master index and the master clock from the master clock regeneration circuit 23, and the master clock is maximum from the initial value 56 of "200" clocks. It is set so that a block pulse is generated at the time when the master index is repeatedly supplied to the value 255 and the master index is supplied, and at the time when the counter reaches the maximum value 255, and the counter returns to the initial value 56 at the master clock next to the time.

Further, it is assumed that the initial value is set in the register in the memory address counter which is a programmable counter by the servo write control unit 21. The block address counter in the address generation circuit 24 is
With the supply of master index and block pulse,
It is cleared to "0" at the time of the master index, the block pulse is counted, and the block address is generated by repeatedly counting up from "0" to "49".

Further, the count values of the memory address counter and the block address counter are set to be supplied as memory addresses to SRAM1 and SRAM2 in the servo data storage generation circuit, respectively.

In the SRAM 1, from the address 56 to the address 255, predetermined data is written in advance by the servo write control unit 21. It is assumed that the SRAM 2 has predetermined data written in advance from the address 0 to the address 49 by the servo write control unit 21.

When the servo data write / verify control circuit 27 receives a servo data write command or a verify command from the servo write control unit 21, the servo data write / verify control circuit 27 recognizes the block pulse generated by the address generation circuit 24 immediately thereafter. Then, the actual operation of writing or verifying is started, and an instruction to return the count value to the initial value 14 and an instruction to start the counting operation of the block pulse are given to the 1-track counter 26 by the next block pulse. I shall.

The 1-track counter 26 is an 8-bit counter and the servo data write / verify control circuit 27.
In response to this instruction, the block pulse from the initial value 14 to the maximum value 63 is counted for one rotation, and the fact that the maximum value is reached is notified to the servo data write / verify control circuit 27.

Further, it is assumed that the initial value is set in the register in the one-track counter 26 which is a programmable counter by the servo write control section 21. When the servo data write / verify control circuit 27 receives the maximum value signal of the 1-track counter 26, the actual operation of writing or verifying is completed by the next block pulse, and the counting operation of the 1-track counter 26 is completed. Shall be instructed.

That is, the master clock and the master clock prerecorded on the magnetic disk provided in the hard disk device 22 are the master clock reproducing circuit 23.
The memory address counter in the address generation circuit 24 generates a block pulse every master clock count of “200” based on the master index, and the block address counter in the address generation circuit 24 reproduces the block address. Are repeatedly counted up between "0" and "49", and the count values of the memory address counter and the block address counter are supplied as memory addresses to the SRAM1 and SRAM2 in the servo data storage generation circuit, respectively. When a servo data write command is given by the servo write control unit 21 at time t1, for example, immediately after that, a block pulse generated by the address generation circuit 24 is used for one rotation "14" by the one track counter 26. Block count operation is started - "63".

Then, in the servo data storage generation circuit 25, the data stored in the SRAM1 and SRAM2 are read out according to the memory address and the block address supplied from the address generation circuit 24 and supplied to the processing circuit.

The data read from the SRAM 1 is basic servo data in block units, and the data read from the SRAM 2 is processing information corresponding to the block address for the basic servo data.

In the processing circuit in the servo data storage generation circuit 25, the basic servo data is processed according to the processing information and then supplied to the write / verify control circuit 27. That is, different data is added to the basic servo data for each block in the address information portion.

In the timing chart of FIG. 2, the next block address at the time t1 when the write command is given is "1". At this time, the processing information of the SRAM2 indicates that the first block is different from the address information portion. It is instructed to add a signal indicating that there is no data and a block number "1", and the processing circuit adds data to the basic servo data according to the instruction and supplies it to the write / verify control circuit 27.

Next, when the block address becomes "2",
The processing information of the SRAM 2 is instructed to add a signal indicating that it is not the first block and the block number “2” to the address information portion, and the processing circuit accordingly adds data to the basic servo data. , Write / verify control circuit 27.

When the magnetic disk makes one revolution from the time t1 when the write command is given, the block address becomes "0", and the processing information of the SRAM2 indicates that it is the first block for the address information portion. It is instructed to add a signal and a signal indicating the block number "0", and the processing circuit accordingly adds data to the basic servo data and supplies it to the write / verify control circuit 27.

The write / verify control circuit 27 is shown in FIG.
In the timing chart of FIG. 5, the command for opening the WRITE GATE to the hard disk device 22 and the servo data supplied from the servo data generation circuit 25 are supplied as WRITE DATA from the next block pulse at time t1 when the write command is given.

Further, the write / verify control circuit 27
In the timing chart of FIG. 2, the 1-track counter 26 is instructed to start counting the block pulse from the block pulse next to the time t1 given by the write command.

The 1-track counter 26 starts counting the block pulse in response to the count start instruction of the write / verify control circuit 27, and when the block pulse corresponding to one rotation of the magnetic disk is counted, the value becomes the maximum value, and the maximum value. The write / verify control circuit 27 is notified that the value has been reached.

The write / verify control circuit 27 receives the maximum value signal of the 1-track counter 26 and stops the supply of the WRITE GATE command and the WRITE DATA to the hard disk device 22.

Further, the write / verify control circuit 27 instructs the 1-track counter 26 to end the counting operation. In this way, the servo data to which the necessary data is added corresponding to the block address is written to the hard disk device 22 for one rotation.

When the writing of the servo data for one rotation is completed, the magnetic head of the hard disk device 22 moves (seeks) to the next track according to the control signal of the servo write controller 21.

Further, the servo write control unit 21 causes the SRAM 1 in the servo data generation circuit 25 to correspond to the next write target track different data in the address information portion of the stored basic servo data depending on the track. And rewrite.

When the seek and the rewriting of the SRAM 1 are completed, the servo write control section 21 issues a write command.
When the time of this write command is the time when the block address is “1” in the timing chart of FIG. 2, the servo data generation circuit 25 corresponds to the basic servo data from the block address “2” to the block address. Then, the write / verify control circuit 27 starts writing to the hard disk device 22 from the next block address "2" and finishes writing at the block address "1" after one rotation. To do.

Therefore, according to the servo data writing control device having the above structure, the master clock reproduced by the master clock reproducing circuit 23 is used as a reference, and the master clock is divided by the number of blocks per rotation in the address generating circuit 24. A memory address and a block address are generated by counting with the number of clocks, and the block address is generated to process the basic servo data in block units stored in the SRAM1 in the servo data generation circuit 25 for each block recorded in the SRAM2. When the servo data is generated by processing according to the information and the servo data write command is given from the servo write control unit 21, the 1-track counter 26 counts the number of blocks for one rotation from the next next block pulse. , This block During the period when the one track counting operation of the pulse is started / finished, the servo data supplied from the servo data generation circuit 25 is sequentially supplied to the magnetic disk device 22 by the write / verify control circuit 27 in synchronization with the block pulse. Since one rotation is written to the write target track of the disk, the actual servo data write operation is performed from the time when the first block pulse is generated after the servo data write command is given from the servo write control unit 21. It can be started, and the maximum waiting time can be shortened to one-half of the number of blocks per one rotation of the magnetic disk.

Further, the memory for storing servo data is
Since only one block of servo data needs to be stored, the memory capacity can be significantly reduced, and the rewriting time of the address information that is different for each write target track can be significantly reduced.

When performing a verify process after writing the servo data, when a servo data verify command is given from the servo write control unit 21, a master clock recovery circuit 23, an address generation circuit 24, and a servo data generation circuit. 25, the operation of each of the 1-track counters 26 is exactly the same as the servo data writing process. The write / verify control circuit 2 determines whether the data matches the servo data read from the disk.
It is only the operation of comparing and judging in 7.

Therefore, even when this verify operation is performed, as in the case of performing the write operation, after the servo data verify command is given from the servo write control unit 21, until the actual verify operation is started. The maximum waiting time can be reduced to one-half of the number of blocks per rotation of the magnetic disk.

In the above embodiment, the number of master clocks per rotation is set to "10,000", the number of blocks per track is set to "50", and the number of master clocks per block is set to "200". The memory address counter is an 8-bit counter, and "56" to "255"
Up to 200 counts, a block pulse is generated every 200 counts, the 1-track counter is a 6-bit counter, and the count operation is performed from "14" to "63" to recognize one rotation. The 1-track counter is a counter having a sufficient number of bits, and since it is a programmable counter, an initial value can be arbitrarily set, so that the number of master clocks per rotation that changes according to the specifications of servo data, 1 track The number of blocks per block and the number of master clocks per block can be arbitrarily set.

Further, in the above-described embodiment, in the servo data storage generation circuit 25, the processing corresponding to the block address for the basic servo data is processed by the signal indicating the first block at the block address "0" and the block number "0". ", And the block address" 1 "is set to add the signal indicating that the block is not the first block and the block number" 1 ". However, since the processing information corresponding to the block address is stored in the SRAM 2, By changing the processing information stored in the SRAM 2, for example, a signal indicating that the block address "0" is not the first block and a block number "49" are added, and the block address "1" is the first block. Signal and a block number "0" are added according to the specifications of the servo data. It can be set to.

In the above embodiment, the SR in the servo data storage generation circuit 25 is changed every time the track to be written changes.
Although it has been described that the servo write control unit 21 rewrites different data for each track in the address information portion of the basic servo data stored in the AM1, a multi-bit type SRAM is used as the SRAM1 and selectively according to the track. By performing the reading, the frequency of rewriting by the servo write control unit 21 can be reduced.

For example, the frequency of rewriting can be reduced to once per 8 tracks by using the SRAM of 8 bit structure. Further, in the above embodiment, the writing of the sector servo data is described as an example. However, by changing the setting of the servo data stored in the SRAM 1, the number of blocks per track, and the number of master clocks per block, the servo surface servo is changed. Data can also be written.

[0072]

As described above, according to the first servo data write control device of the present invention, the servo data storage generation means is synchronized with the start point signal for each block generated by the first counter means. The servo data stored in one unit of block starts writing or verifying the servo data to the magnetic disk, and
When the second counter means recognizes one rotation of the magnetic disk, the writing or verifying of the servo data for the magnetic disk is completed. Therefore, after the servo data writing or verifying command, the master index can be read first without waiting for the master index. The writing or verification of the servo data for one rotation of the magnetic disk is started from the time when the starting point signal for each block is generated.

Further, according to the second servo data write control device of the present invention, among the address data in the servo data stored in block units, corresponding to the block address obtained by the third counter means. Different data is processed and generated for each block, and writing or verification of the servo data to the magnetic disk is started by the generated servo data in synchronization with the block signal generated by the first counter means. At the same time, when one rotation of the magnetic disk is recognized by the second counter means, the writing or verification of the servo data for the magnetic disk is completed, so that it is not necessary to store all the servo data for one rotation of the magnetic disk. ,
Further, after the servo data write or verify command, without waiting for the master index, the servo data write or verify for one rotation of the magnetic disk is started from the time when the first block signal is generated.

Further, according to the third servo data write controller of the present invention, in the first or second servo data write controller, the first counter means and the second counter means are provided. Since each of them is configured by using a programmable counter, the count set value in each counter means can be arbitrarily set according to the number of master clocks and the number of blocks per one rotation of the magnetic disk.

Further, according to the fourth servo data write control device of the present invention, in the second servo data write control device, the servo data storage generation means thereof is
When processing different data among the address data in the servo data stored in one unit of the block to be written on the magnetic disk in correspondence with the block address generated by the third counter means, the block address Since the processing information corresponding to is stored in the rewritable memory, it is possible to arbitrarily set the correspondence between the block address and the address data in the servo data, which is different for each block.

Therefore, according to the present invention, it becomes possible to start the actual operation without causing a long waiting time when performing the servo data writing process or the verify process, and at the same time, the servo data is track-by-track unit. Since it is not necessary to store the data, the storage capacity of the memory can be significantly reduced, and the rewriting time of the servo data stored in the memory can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a servo data write control device according to an embodiment of the present invention.

FIG. 2 is a timing chart showing a servo data write operation in the servo data write control device.

FIG. 3 is a diagram showing a structure of a servo sector in a track in a sector servo type magnetic disk.

FIG. 4 is a diagram showing a configuration of servo data SD in a servo area SA on a magnetic disk.

FIG. 5 is a timing chart showing a writing operation of servo data SD by a conventional servo data writing device.

[Explanation of symbols]

SD ... Servo data, 11a ... Prefix data, 11b ... Address data, 11c ... Position error detection data, 21 ... Servo write controller, 22 ... Magnetic disk device, 23 ... Master clock reproducing circuit, 23a ... Clock head, 24
... address generation circuit, 25 ... servo data storage generation circuit, 26 ... 1 track counter, 27 ... write / verify control circuit.

Claims (6)

[Claims] 1. A servo data write controller for writing or verifying servo data on a magnetic disk using one master index per one rotation and a preset number of master clocks, wherein the master index Is obtained by dividing the master clock by a number obtained by dividing the master clock by the number of blocks per one rotation of the magnetic disk, and generating a start point signal for each block, and the first counter means. Second counter means for recognizing one rotation of the magnetic disk by counting the start point signal for each block for the number of blocks per one rotation of the magnetic disk, and storing servo data to be written on the magnetic disk in one block unit Generated by the servo data storage means and the first counter means. Writing or verifying of the servo data to the magnetic disk is started by the servo data stored in the servo data storage means in synchronization with the start point signal of each block. A servo data write control device, comprising: a write / verify control means for terminating the write or verify of servo data to the magnetic disk when rotation is recognized. 2. A servo data write control device for writing or verifying servo data on a magnetic disk using one master index per rotation and a preset number of master clocks, wherein the master index Is obtained by dividing the master clock by a number obtained by dividing the master clock by the number of blocks per one rotation of the magnetic disk, and generating a start point signal for each block, and the first counter means. Second counter means for counting the number of blocks per block of one rotation of the magnetic disk for recognizing one rotation of the magnetic disk, and the start point signal for each block obtained by the first counter means By counting based on the master index, the master index Third counter means for obtaining a block address with reference to the memory, servo data to be written on the magnetic disk is stored in one block unit, and read out in correspondence with the block address obtained by the third counter means. Servo data storage generation means for processing and generating the contents, and servo for the magnetic disk by the servo data generated by the servo data storage generation means in synchronization with the start point signal for each block generated by the first counter means. Write / verify control means for starting writing or verifying of data and ending servo data writing or verify for the magnetic disk when the second counter means recognizes one revolution of the magnetic disk. Servo data characterized by Write control unit. 3. The servo data write control device according to claim 1, wherein each of the first counter means and the second counter means is configured by using a programmable counter. 4. The servo data storage generation means corresponds to a block address when processing the contents of the block-unit servo data to be written to the magnetic disk in correspondence with the block address obtained by the third counter means. 3. The servo data write control device according to claim 2, wherein the correspondence between the block address and the content to be processed is programmable by storing and reproducing the processing information to be processed in a rewritable memory. 5. A servo data write control method for writing or verifying servo data on a magnetic disk using one master index per revolution and a preset number of master clocks, wherein the master index The master clock is divided by the number of blocks per revolution of the magnetic disk to generate a start point signal for each block, and the start point signal for each block is per revolution of the magnetic disk. A step of counting the number of blocks for recognizing one rotation of the magnetic disk;
A step of starting writing or verifying of servo data to the magnetic disk by the servo data stored in units; and a start point signal for each block is counted by the number of blocks per one rotation of the magnetic disk to make one rotation of the magnetic disk. Recognizing one revolution of the magnetic disk by the step of recognizing the above-mentioned step, the step of terminating the writing or verifying of the servo data for the magnetic disk is carried out. 6. A servo data write control method for writing or verifying servo data on a magnetic disk using one master index per revolution and a preset number of master clocks, wherein the master index The master clock is divided by the number of blocks per one rotation of the magnetic disk to generate a starting point signal for each block, and the starting point signal for each block is counted based on the master index. Generating a block address with the master index as a reference, and recognizing one rotation of the magnetic disk by counting the start point signal for each block for the number of blocks per one rotation of the magnetic disk, You should write to the magnetic disk. A step of processing and generating the content of the servo data stored in advance in one unit of the lock corresponding to the block address; and the magnetic field generated by the servo data generated in synchronization with the start point signal of each block. One rotation of the magnetic disk is performed by starting the writing or verification of servo data to the disk, and by counting the start point signal for each block for the number of blocks per one rotation of the magnetic disk and recognizing one rotation of the magnetic disk. And a step of terminating the writing or verifying of the servo data with respect to the magnetic disk when the above is recognized, the servo data writing control method.