JPH07287968A - Disk device - Google Patents

Abstract

PURPOSE:To improve the efficiency of a format without drastically decreasing the data transfer speed. CONSTITUTION:Each sector 102 consists of a servo region 103 and a data region 111, ID information 113 showing an address of this sector is arranged in the data region 111 with user data. In a data part 112, each region is arranged in the order of the following. That is, a gap region GAP1 absorbing rotation variation of a magnetic disk, a SYNC 1 region synchronizing a circuit, an AM1 region informing that a header indicating an address of a sector reaches, and a header 114. The header 114 is constituted of a cylinder number CYL, a head number HD, a sector number SECT, a flag FLAG showing the state of the sector. An user data region is arranged after a CRC code, and each region is arranged in the order of an ECC code, a PAD region, and a gap region GAP2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device,
In particular, the present invention relates to a disk device for recording and reproducing data on a disk in an auxiliary storage device of an electronic data processing device.

[0002]

2. Description of the Related Art SCSI (S
mall Computer System Inte
The interface is connected to the host through an interface such as rface), and the disk device is controlled by the command from the host according to the SCSI protocol. Figure 1
FIG. 1 shows a block diagram of an example of this conventional disk device.

In FIG. 1, the disk device 200 and the host computer 215 are, for example, SCSI (Small Computer) which is a standard interface.
rSystem Interface). The disk device 200 includes a magnetic disk 201, a magnetic head 101, and a voice coil motor (VCM: Voice Coil Moto) for driving the head 101.
r) 203, and a mechanical unit composed of a spindle motor 204 for rotating the magnetic disk 201, a read / write (R / W) circuit 205, and a data processing unit 206.
And a data buffer 211, a central processing unit (CPU) 209 that controls each part of the device, and a mechanism control unit (mechanical control unit) that controls this mechanism unit according to an instruction from the CPU 209 so that the data of the relevant sector can be read. Part) 214
It is composed of and.

By the way, the user's needs required for the disk device include a large capacity, a small size, a low price, and a high performance. Among them, in order to realize a large capacity, each disk device manufacturer is competing with how much data is recorded on a disk in a predetermined size. To this end, the characteristics of the magnetic disk 201 and the head 101 for recording data are improved, and PRML (Partial Response M) is used.
By adopting a new signal processing method such as the Aximum Likelihood), efforts are being made to increase the amount of data stored per unit area of the magnetic disk 201.

On the magnetic disk 201, user data, head servo information for moving the disk device, and additional information such as a sector number indicating a data management number are recorded. Therefore, after maximizing the data storage capacity per unit area with the current technology, it is a technique how to efficiently store user data on the magnetic disk 201. This is the format efficiency, which is shown by the total storage capacity of user data (= format capacity) / total storage capacity of device (= unformat capacity).

[0006] If the technologies for improving the recording density of the medium are almost the same for all manufacturers, it is significant to consider the format method as the data management method in order to realize the large capacity required by the user. There is. In today's technology for increasing the capacity of disk devices, in order to differentiate from competitors, we will consider cost increase, but we will introduce it as much as possible because it has the greatest effect on capacity increase. Go. Recently, a constant density recording method (CDR: Constant) is used to make the data recording densities on the inner and outer circumferences of the magnetic disk 201 comparable.
It is known that the storage capacity of the device is improved by about 20% by adopting Density Recording).

Here, the format pattern of the conventional magnetic disk device 200 will be described with reference to FIG. Here, a case of writing data will be described. Further, the positioning of this magnetic disk device is premised on the case where a data surface servo system recorded on a disk for recording data is adopted. First, the magnetic head 1
Consider that 01 writes data to the sector 102 on the magnetic disk 201.

The sector 102 on the magnetic disk 201 is
As shown in FIG. 12A, a servo area 103 for knowing the deviation of the magnetic head 101 from the track center and a data area 104 for storing data are arranged in this order. Further, looking at the data area 104 in detail,
An ID section 105 that indicates the address of the sector for determining whether or not the sector is to write data and a data section 106 that finally writes the data are configured in this order.

As shown in FIG. 12B, the ID section 105
The GAP1 immediately before the GAP1 and the GAP2 immediately after the data section 106 are each a 5-byte length and are gap areas for absorbing the rotational fluctuation of the magnetic disk 201. Here, a servo area which is not disclosed to the user is embedded. The ID section 105 has the following configuration. First, there is the SYNC1 area for synchronizing the circuit and the AM1 area for notifying that the header indicating the address of the sector is coming. The header 107 is composed of a cylinder number of this sector, a head number, a sector number, and a flag indicating the state of this sector. The flag indicates whether this sector can be used. Next, a CRC code for confirming whether or not the information in the header 107 has an error is attached.

In order to record data on a magnetic disk, a 01 signal (called NRZ signal in the case of serial) used for exchanging data between a host and a magnetic disk device is recorded on a medium. You need to change the code to the one that suits you. This is what is called a 1-7, 2-7, or 8-9 code. In this encoding, the circuit cannot perform code conversion unless a certain amount of signal is input. for that reason,
In addition to the header information to be recorded on the magnetic disk, it is necessary to add information to the extent that the circuit can perform code conversion. This information is slightly recorded on the magnetic disk. This is a 4-byte length PAD area as shown in FIG.

In the case of a magnetic disk device, it is known from the information in the ID area whether the sector is a target sector, and if the sector is a target sector, data is written in the next area. An area for gaining time until the preparation of the electronic circuit for writing is completed is a 6-byte long W.D. It is SPLICE.

When the above ID area ends, a data section 106 for storing user data follows. DATA part 1
06 also synchronizes with the SYNC2 area for synchronizing the circuit.
The user data area comes after the AM2 area which knows the data start timing. After the user data area, an ECC code for detecting / correcting a data reading error is attached. Further, following the data portion 106, a PAD area required for encoding suitable for recording on a magnetic disk is formed. The above is the description of the sector format.

Next, the servo area 103 will be described. Recording information (servo information) of this servo area 103
Is hidden in the GAP1 and GAP2 regions as described above and does not need to be disclosed to the user. This servo information is 61-byte-long information consisting of an area for identifying the cylinder number in the disk device, an area for identifying the subtle deviation from the head track in the disk device, and a connecting area. Is.

In the servo processing, since the control of positioning the magnetic head using the analog position signal is realized, the reproduction output value of the recorded signal of the magnetic disk is kept constant regardless of the position of the magnetic head. want you to do. Therefore, FIG.
As shown in (C), 1 at the beginning of the servo area 103
Automatic gain control (AGC: Auto Gain) so that the amplitude value of the circuit is constant in the ISG1 area of 5 bytes.
Control) fixes the amplitude value of the reproduction signal.

Next, as shown by "DC" in FIG. 12 (C), there is a DC erase area indicating the timing for the circuit to know the start of the position information. Next comes the AM area in which the code for generating the pulse indicating the start of the sector is recorded. With this code, a sector pulse and an index pulse are generated. After this, CYL indicating the track number
The area continues. This is recorded in gray code so that at most one cylinder will be read incorrectly.

Further, a burst field exists following the CYL area. The burst field includes four-phase patterns POSA to POSD for identifying a slight deviation from the track of the magnetic head, and an MA area before and after these signals for taking a circuit discharge time. There is. This is followed by a 2-byte long ISG2 area indicating the end of the servo area.

In the case of the data surface servo system which employs the sector servo system, the user often discloses only the format shown in FIG. 12B. This GAP2
The servo information of FIG. 12C is embedded in the 73-byte length of + GAP1. Here, the servo area must never be erased by writing user data. Therefore, an extra bit width is taken to open a gap between the servo area and the user data area. This extra bit width is 12 bytes (= 73B-61B) here, leaving 6 bytes before and after the servo.

The above is a description of the operation of each part of the conventional format pattern of the magnetic disk device.

Next, a data read operation of the conventional disk device shown in FIG. 11 will be described. First, an instruction to read data from the host computer 215 is sent to the disk device 200 according to the SCSI protocol. The SCSI command transferred to the disk device 200 is an S command in the data processing unit 206 of the disk device 200.
Received by the CSI control unit 212, the CPU I
It is sent to the CPU 209 via the / F control unit 208, and the SCSI command is interpreted. This allows
The CPU 209 starts the work of reading the data of the corresponding sector of the drive.

Next, the CPU 209 starts the read operation of the corresponding sector in response to the data read request sent from the host computer 215. That is, CPU2
09 instructs the mechanical control unit 214 to read data. Then, the mechanical control unit 214 reads out from the magnetic disk 201 having the format pattern described above by the magnetic head 101 and determines whether the track is a corresponding track based on the servo area information input via the R / W circuit 205. Is detected with a gray code and the amount of head displacement is detected with a position signal (4 phase pattern POSA to POSD).
The mechanical mechanism unit is controlled based on the detection result, and the magnetic head 101 is positioned at the center of the corresponding track of the magnetic disk 201. As a result, the magnetic head 101 is positioned at the center of the corresponding track.

Next, the magnetic head 101 enters the data area 104 of the magnetic disk 201 shown in FIG. 12A, and passes through the ID section 105 and the data section 106. First,
In the ID section 105, the header (107 in FIG. 12B) that is the address of the sector is read by the magnetic head 101, and the drive I / F is passed through the R / W circuit 205.
It is taken into the control unit 207. Where C
The PU 209 or the like sets the header information of the sector to be read in a register (not shown) in the drive I / F control unit 207, compares this value with the read header information, and determines whether the sector is the desired sector. Determine whether As a result, the data processing unit 2 determines whether the sector is a relevant one.
06 can be judged.

If the comparison result is a match, the information of the data section 106 following the ID section 105 is stored in the drive I / F control section 207-> buffer control section 210-> data buffer 211-> buffer control section 210 because it is the corresponding sector. → The target data is transferred to the host computer 215 via the SCSI control unit 212. At this time, the drive I / F control unit 20
The data read up to 7 is also transferred to the ECC processing unit 213, where it is checked whether the read data has an error.

If the ECC processing unit 213 detects an error, it normally notifies the CPU 209 that an ECC error has occurred, and the read data sent to the data buffer 211 is read by the host computer 2
The transfer is prohibited so that it is not transferred to 15. ECC on
When the fly correction is adopted, the ECC processing unit 213
The error correction calculation is performed by using the data buffer 211 to calculate the correction position and the correction position.
The contents of the data buffer 211 of the data whose transfer is prohibited are corrected by the CPU 209 or by automatic correction. As a result, the transfer of the contents of the data buffer 211 to the host computer 215 can be restarted.

In this way, each part of the format recorded on the magnetic disk 201 is stored in the disk device 20.
The disk device 200 operates corresponding to each part of the electronic circuit of 0.

By the way, as a conventional disk device other than the conventional disk device having the above-mentioned structure, a disk device having a dual head is known, and its format pattern is shown in FIG. 13, for example. In the figure, FIG.
The same symbols as 2 indicate the same functions. As shown in FIG. 13A, a plurality of sectors are recorded for each track, and one index pulse is recorded. As shown in FIG. 13B, the format of each sector is such that the writing ID area is independent of the data section, and the reading ID area is added to the beginning of the data section. Data area is provided.

Since the dual head has the read and write heads bonded to each other, there is a dedicated ID area for each of the write and the read, so that the center of the head is slightly in the circumferential direction of the disk. Deviation, which is about 1.5 μm (track spacing is 7 μm)
This is because the sector address can be read when writing or reading data. Similarly, the servo area is also shown in FIG.
As shown in (C), writing and reading are provided exclusively.

Format patterns other than those described above are known for the format patterns of magnetic disks recorded and reproduced by the above conventional disk device. For example, in the disk device disclosed in Japanese Unexamined Patent Publication No. 3-178093, by using the sector pulse or index pulse generated from the code of the AM area of the servo area 103 described above, the ID section 105 can be read from the magnetic disk. The format efficiency is improved by making the format pattern unnecessary. Specifically, the sector counter value is cleared from the index pulse existing at one position on one track, and the counter is incremented by the sector pulse generated at the beginning of each sector. This allows
This is so that it is possible to know the number of the sector of the corresponding track.

Further, today, the frequency of occurrence of data errors due to high density recording is increasing. In the past, the error occurrence frequency of the medium was about 10 ^-10 (sectors / bits), but it has deteriorated to 10 ^-7 (sectors / bits). That is, a situation has occurred in which an error occurs in a sector that is 1000 times as large as that in the related art. This is no exception because the ID part is also recorded on the same medium. However, the number of bytes in the ID part is significantly smaller than the number of bytes in the data part, so from the probability theory, the frequency of occurrence of errors decreases.

However, when the conventional format pattern as shown in FIG. 12 is adopted, when an error is detected in the ID information, the corresponding sector cannot be recognized, and
Since the ID part does not have error correction code (ECC) information, it cannot be corrected. Therefore, in this case, there is only a method such as trying a retry or estimating from the information of the ID part of the preceding and following sectors. Therefore, in the conventional disk device disclosed in Japanese Patent Laid-Open No. 63-86160, a dedicated ECC is attached to the ID section so that the error in the ID section can be corrected.

[0030]

However, in the former conventional disk device in which the format efficiency is improved by making the format pattern without the ID part, the format efficiency is improved by eliminating the ID part. However, the track number, the head number, the sector number, and the flag information contained in the ID part are not all checked by other methods. Only the means for recognizing the sector number is disclosed.

Further, in this conventional disk device, since the sector number is recognized based on the index pulse, which is present only once in one track, if the index pulse is not recognized, the head moves to the corresponding track. Even if the positioning is successful, the sector number cannot be recognized immediately.

For example, the sector for reading data is
Consider a case where the head is positioned in the middle of the head sector of the track immediately after the index pulse in the last sector of the track. At this time, in order to know the sector number, the electronic circuit of the disk device waits about one rotation until the index pulse is generated. Furthermore, after the index pulse is generated, the sector number of the corresponding track can be recognized for the first time, and about one rotation is waited until the target final sector of the corresponding track is reached. Therefore, in this case, it takes about two rotations to read the corresponding sector.

Therefore, in the above conventional disk device,
The rotation waiting time may be about twice as long as that in the case where the ID part is provided, which causes the data transfer performance of the disk device to be significantly deteriorated. Also,
The above-mentioned Japanese Patent Laid-Open No. 3-178093 does not disclose means for detecting an error when positioning on a different track due to a malfunction of the mechanical control unit.

Further, the latter conventional disk device in which an error in the ID part can be corrected by attaching a dedicated ECC to the ID part is also used in the latter conventional disk device by adding a dedicated ECC to the ID part. Formatting efficiency is deteriorated, and if the strong ECC having 10 bytes or more for the data portion is added for the ID portion having only about 10 bytes at most, the formatting efficiency is also deteriorated. Further, in this conventional disk device, since the ECC circuit dedicated to the ID section is newly provided in the data processing section,
There is a problem that the circuit scale of the data processing unit is increased, which eventually leads to an increase in the cost of the circuit.

It is an object of the present invention to provide a disk device which does not significantly deteriorate the data transfer rate of the disk device and improves the format efficiency.

Another object of the present invention is to provide a disk device which improves the format efficiency and does not impair the read / write reliability of the drive device.

Another object of the present invention is to realize error correction of the ID part without degrading the format efficiency.

[0038]

In order to achieve the above object, in the present invention, a data section containing desired data is recorded on a disk-shaped recording medium by a head in sector units via a gap and reproduced. The disk device is configured to have a recording unit for recording address information indicating an address in sector units on a disk-shaped recording medium.

The recording means may be arranged to record the address information in the data section.

The recording means sequentially records the servo information used for positioning the head and the data portion in each sector on the disk-shaped recording medium, and
The address information may be arranged and recorded in the servo information.

The recording means sequentially records the servo information used for positioning the head and the data portion in each sector on the disk-shaped recording medium, and
The address information may be arranged and recorded in the data section and the servo information, respectively.

Further, according to the present invention, a data portion containing desired data is recorded in a sector unit on a disc-shaped recording medium through a gap, and a first recording area of address information in a sector unit for recording. And a second recording area of reproducing sector address information and a third recording area of a reproduced data portion by a recording head and reproducing the recorded information by the reproducing head. At
Address information indicating an address of a sector unit for reproduction is arranged in the data portion and has a recording means for recording on a disk-shaped recording medium.

Further, the recording means sequentially records the address information in each sector following the data section.

Further, the recording means adds an error detection code for detecting an error in the address information to the address information and records it.

The recording means adds the error correction code dedicated to the address information to the address information for recording.

Further, the recording means has the address information in the data portion, adds an error correction code including the address information and the data portion, and records it in the data portion.

Further, the recording means shifts the position of the address information so that the sector indicated by the address information in the data part is read out after the maximum error correction time in the error correction code in the data part. It was recorded.

[0048]

In the present invention, since the address information indicating the address in sector units is recorded on the disc-shaped recording medium, it is formed in advance so that it cannot be rewritten by ordinary data writing on the disc-shaped recording medium. The address information area can be eliminated, and the address of the sector can be immediately identified by the address information read first in the corresponding track in which the head is located.

Further, in the present invention, since the address information is arranged and recorded in the data section, the address information can be read out immediately. In the present invention, the servo information used for positioning the head and the data portion are sequentially recorded in each sector on the disk-shaped recording medium, and the address information is arranged and recorded in the servo information. Therefore, it is not rewritten at the time of recording. When the address information is arranged and recorded in the data section and the servo information, respectively,
Since the same address information can be reproduced twice when reading data, the address information can be confirmed.

Further, according to the present invention, in the disk device equipped with the integrated dual head, the address information indicating the address of the reproducing sector unit is arranged in the data section and recorded on the disk recording medium. The address information area for writing can be made independent as in the conventional case, and the address information area for reading which is previously formed so as not to be rewritten by the normal data writing on the disk-shaped recording medium can be eliminated, and the head can be eliminated. The address of the sector can be immediately identified by the address information from the above-mentioned data portion which can be read first in the corresponding track where is located.

Further, in the present invention, since the error detection code for detecting the error of the address information is added to the address information and recorded, the address information error can be detected and the error correction dedicated to the address information can be performed. By adding a code to the address information and recording the address information, an error in the address information can be corrected.

Further, according to the present invention, since the address information is included in the data portion and an error correction code including the address information and the data portion is added and recorded in the data portion,
Error correction can be performed by including address information as well as user data in the data section.

Further, in the present invention, the error correction code in the data section is set after the maximum error correction time,
Since the position of the address information is shifted and recorded so that the sector indicated by the address information in the data portion is read, on-the-fly correction due to the occurrence of the address information error can be realized.

[0054]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where the embodiment of the present invention is applied to a magnetic disk device will be described below. FIG. 1 shows a block diagram of an embodiment of a disk device of the present invention. 11, those parts that are the same as those corresponding parts in FIG. 11 are designated by the same reference numerals, and a description thereof will be omitted.
Further, in FIG. 1, for convenience of illustration, the magnetic disk 201,
VCM 203, spindle motor 204, magnetic head 1
The mechanical part 01 is not shown.

In FIG. 1, the disk device 150 includes a mechanism unit (not shown) and a read / write (R / W) circuit 20.
5, the data processing unit 151, and the data buffer 211
And a central processing unit (CPU) 2 that controls each part of the device
09 and a mechanical control unit (not shown) that controls the mechanical unit according to an instruction from the CPU 209 so that the data of the relevant sector can be read. The basic configuration itself is almost the same as that of the conventional device shown in FIG. 11, but the configuration of the drive I / F control unit 160 in the data processing unit 151, particularly the command sequencer unit 163, is different from the conventional one.

The drive I / F control section 160 is
The serial / parallel (S / P) conversion circuit 161, a data transfer unit 162, a command sequencer unit 163, and a pattern register 164 are included in the pattern register 164 and a CHSF (cylinder head / sector flag) is provided. ) A register 165 is provided. The data transfer unit 162 is connected to the S / P conversion circuit 161 and the buffer control unit 210 by bidirectional data buses, while data is input from the pattern register 164 via the data bus, and the ECC processing unit 213 is also provided. And the command sequencer unit 163 via a bidirectional bus. The command sequencer unit 163 also includes a pattern register 164 and an S / P conversion circuit 1.
61, ECC processing unit 213, buffer control unit 2
10 are connected to each other via bidirectional control buses.

It is assumed that the disk apparatus employs the sector servo, but it does not matter if the head positioning method is different from the servo method such as the servo surface servo and the split servo.

This drive I / F control section 160
The format pattern formed on the track on the magnetic disk will be described. FIG. 2 is a diagram showing a first embodiment of a format pattern according to the device of the present invention. The present embodiment is a format pattern of a sector having ID information in the data part.
The same reference numerals are attached.

In FIG. 2, each sector 102 is similar to the conventional one in that it is composed of a servo area 103 and a data area 111, but ID information 113 indicating the address of this sector is arranged in the data area 111 together with user data. The point is characteristic. Reference numeral 101 shown in FIG. 2A is a magnetic head (not shown in FIG. 1), which is a read / write type.

As shown in FIG. 2B, the format configuration of the data section 112 is such that a gap area GAP1 for absorbing the rotational fluctuation of the magnetic disk, a SYNC1 area for synchronizing the circuit, and a sector address. The header 114 comes after the AM1 area informing that the header indicating the is coming. The header 114 has a cylinder number CYL, a head number HD, and a sector number SEC of this sector, as in the conventional case.
T, a flag FLAG indicating the state of this sector.

Subsequently, a user data area is arranged next to the CRC code, and further each area is arranged in the order of the error correction code ECC code, PAD area, and gap area GAP2. The format pattern of the servo area 103 is the same as that of the conventional servo area 103, as shown in FIG.

Next, the recording / reproducing operation of the magnetic disk of this format pattern by the disk device shown in FIG. 1 will be described. First, the operation at the time of reading data (at the time of reading data) will be described.

In FIG. 1, when the magnetic head is positioned on the target track on the magnetic disk, the contents of the sector data section of the corresponding track are taken into the drive I / F control section 160 via the R / W circuit 205. Be done. At this time, since the read data is usually 1 or 2 bits, the S / P conversion circuit 161 performs serial-parallel conversion. As a result, the S / P conversion circuit 1
The byte data is extracted from 61 and the data transfer unit 16
Sent to 2. This data transfer unit is provided in advance in the CPU 2
In accordance with the instruction of the command sequencer unit 163 given the operation instruction by the command 09, the operation is performed according to the flowchart of FIG.

That is, first, processing is started from the start of the command (step 301), and an E having a CRC check circuit for checking a read error in the ID part and an ECC circuit for checking / correcting a read error in the data part.
The CC processing unit 213 is initialized (step 302).

Next, an index indicating the beginning of the sector /
Wait for sector pulse input (step 30)
3). When this pulse is input, in the normal case, the magnetic head, as shown in FIGS.
Since C1 is to be read, it is checked whether or not this SYNC1 is read within a predetermined time set in the CPU 209 in advance (steps 304, 305).

If the SYNC1 is not read within the predetermined time set in the CPU 209 in advance, an error will occur as a time-out, and the processing will move to error processing (step 317). On the other hand, when SYNC1 is read out within a predetermined time set in advance by the CPU 209, the SYNC information recorded on the magnetic disk normally ends for the time when it should have been recorded on the magnetic disk, and the data Part 1
It is checked whether the address mark (AM1) indicating the head of 12 is detected (steps 306 and 30).
7). When AM1 is not detected within the predetermined time, the time is over again, and the CPU 209 shifts the processing to a predetermined error processing (step 317).

When AM1 is normally detected, the byte position of the data being read can be determined, and as can be seen from FIG. 2 (B), the information of the header 114 to be reproduced subsequently is transferred to the pattern register 164 or the data buffer. Write to 211 (step 308). The data from AM1 to ECC in the data section 112 shown in FIG.
Since the data is the ECC check / correction target data, all data is sent to the ECC processing unit 213 unless error processing occurs.
At this time, in order to detect a read error in the header section 114, the header information is also sent to the CRC circuit in the ECC processing section 213 which has been initialized.

Next, the CRC for detecting the read error of the header section 114 is read and sent to the CRC circuit (step 309). As a result, when the CRC circuit detects an error, there is a high possibility that a read error has occurred somewhere in the header information and the CRC information, and therefore the header 114 indicating the address of the sector is not reliable. Therefore, again, error processing is performed (steps 310 and 31).
7).

If no CRC error has occurred, the sector number to be read (the host computer 2
CHSF register 16 showing the sector address requested by 15
5 value) and the previous register 164 or data buffer 211
It is checked whether or not the sector number in the header information stored in (3) matches. If they do not match, it is normal to move to the processing of step 302, but if the sector in question is not on the current track, the processing will continue indefinitely, so the retry processing is repeated many times. The processing is moved to the error processing 317 in order to check whether it is high.

On the other hand, when it is determined in step 311 that they match each other, the user data is read into the data buffer 211 by the set number of bytes (step 312). Then, an ECC code for checking / correcting the read error of the data section 112 is input to the ECC processing section 213 (step 313), and an ECC error check is performed (step 314). When an ECC error occurs, EC
C error processing is performed (step 316). When the ECC error does not occur, it is determined that the data has been normally read and the process proceeds to the next process (step 317).

In this way, according to this embodiment, as shown in FIG.
Data can be read from the magnetic disk having the format pattern of the first embodiment shown in FIG. Of course, since the data is continuously read, the CR in step 310 is performed.
It is not necessary to read the user data sequentially after the C error detection check and the header match detection in step 311. After the user data is temporarily stored in the data buffer 211, an error is determined, and if there is an error or a mismatch, the user data temporarily stored in the data buffer 211 is invalidated, and if the header does not match, it is used for the data in the read-ahead cache. There is no problem even if you perform the process of.

According to the present embodiment, in order for the head to know the corresponding sector number, the area of the data section is read,
The address of the sector (sector information: cylinder number, head number, sector number, flag information) added to the beginning of the data can be read, and the electronic circuit of the disk device can recognize the address of this sector. As a result, in this embodiment, the sector can be recognized after about one rotation at the maximum. This is almost the same as in the case where the conventional ID part exists.

Further, in the conventional device which knows the sector number by the method of counting the index pulse and the sector pulse, the target sector is recognized after the worst two rotations.
This embodiment is twice as fast as the data processing speed of the drive. Further, in the case of the conventional device of the index and sector pulse system, if the corresponding track is not selected due to an abnormality in the mechanical control unit, the cylinder number and head number must be entered in the sector servo information, and another There is also concern about reading and writing data. However, in this embodiment,
This is not the case because the data section 112 has a CRC code for the header.

Further, in this embodiment, as shown in FIG. 2, since the data portion includes the ID information 113,
Comparing the format efficiency with the format of FIG. 12, it becomes as follows.

Format efficiency of the first embodiment of FIG. 2 = (520/662) × 100 = 78.5%. ． ． (1) Conventional format efficiency of FIG. 12 = (520/718) × 100 = 72.4%. ． ． (2) Therefore, the format efficiency of this embodiment is about 6% (5
It can be seen that 6 bytes / sector is released).

Further, in the present embodiment of the format shown in FIG. 2, since the CRC is added after the header 114 representing the ID information, at the time of data reading, whether or not an error is present in the ID portion, the data of the corresponding sector is read. Even if you do not read all parts, you can see immediately after reading ID information, CR
If a C error has not occurred, it can be immediately determined whether this sector is the relevant sector. Furthermore, I
By generating / adding the ECC of the data part 112 including the D information, even if an error occurs in the ID information part, there is a possibility that it can be corrected by the ECC data.

As a result, the data processing speed is equivalent to that of the conventional format pattern, and the format efficiency is good,
Further, it is possible to instantly judge whether the ID part is correct by CRC, and further, if an error is added to the ID information, ECC correction can be realized without providing an ECC circuit dedicated to the ID information. . Of course, the ID information may be anywhere in the data section depending on the design concept of the disk device.

Next, the operation at the time of writing data (at the time of writing data) of this embodiment will be described. When writing the format pattern of FIG. 2, unlike the case of writing the format pattern shown in FIG. 12, it is necessary to read the data section 112 once to know where the corresponding sector is. In this case, reading is performed in step 3 shown in FIG.
By performing up to 11, the address of the sector where the magnetic head is currently passing can be known. From this address, the command sequencer unit 163 determines whether the next sector is a write target.

That is, at the time of data write, the CPU 209 sets the number of the sector preceding the relevant sector in the CHSF register 165 shown in FIG. 1, and if the previous sector of the relevant sector is recognized, the next Writing of data will be started from SYNC1 of the sector which comes to. At this time, AM1 and ID information must be recorded on the magnetic disk, but this may be set in the pattern register 164 in advance and the user data can be output from here. Of course, the data buffer 211
In advance, the user data may be added and stored in advance before being stored, and when the relevant sector is reached, the entire data may be output from the data buffer.

When the next sector is a write target,
The command sequencer unit 163 operates according to the flowchart of FIG. That is, first, command start processing is performed (step 401). Then, an ECC processing unit 213 having a CRC generation / check circuit for generating / checking a read error of the ID information 113 and an ECC circuit for checking / correcting a read error of the data information is initialized (step 402). Next, it is detected whether the index / sector pulse indicating the beginning of the sector is input (step 403).

When this pulse is detected, the magnetic head starts recording in the format shown in FIG. 2 (steps 404 to 410). That is, first, SYNC1 shown in FIG. 2B is written (step 404), and then the address mark AM1 is written (step 405).
Then, the header 114 indicating the sector address or the like is written (step 406), and then the CRC code, the user data, the ECC code, and the PAD are sequentially written (steps 407 to 410). After this processing, the next command processing is performed (step 411).

As a result, the data format pattern shown in FIG. 2 having the ID information in the data section is written at the desired position on the magnetic disk.

By the way, in the above description, the ID information 11
3 has been described in the case of entering the number of the sector in which the ID information 113 exists, but of course, according to the format pattern of FIG.
Since it is configured to include the CC code, the ECC correction of the ID information 113 is possible, so that the data part that precedes the relevant sector and the maximum value of the ECC correction operation time does not reach the relevant sector Alternatively, the ID information 113 may be recorded. As a result, even if an error occurs in the ID information 113, the correction calculation of the ID information 113 is performed,
After repairing, the head can reach the target sector. Therefore, of course, there is no problem even if the on-the-fly correction of the ID information is realized.

On-the-fly correction of this ID information will be described with reference to FIG. 2, those parts which are the same as those corresponding parts in FIG. 2 are designated by the same reference numerals, and a description thereof will be omitted. Figure 5 (A)
It is assumed that the ID information is contained in the sectors preceding the actual sector in each of the sectors 501 to 503 shown in FIG. If the number of preceding sectors is E of the ID information 113,
Even if a CC error occurs, the number of sectors is farther than the maximum time required for the ECC correction operation to end, which is the sector passing time.

Now, let us consider a case where the disk device reads data in sector n + 2. First, the magnetic head 101
As shown in FIG. 5A, it passes through the servo area 103 of the nth sector 501 (hereinafter, also referred to as sector n). This makes it possible to know how far the magnetic head 101 is from the corresponding track. Than this,
The mechanical control unit positions the magnetic head 101 at the target track center.

Next, the magnetic head 101 reads the data area 111 of the sector n, that is, the data section 112. Here, since the data section 112 applies the ECC code to the data section including the ID information 113, the first ECC processing circuit in the ECC processing section 213 in FIG. 1 is activated, and the data has no error. Check

Here, consider a case where an error occurs in the ID information 113. Also, the ID information 113 of the sector n
Indicates the ID number of sector n + 2 (503). When this ID information 113 is read, an error occurs in the ID information, so a CRC error occurs. Therefore, the first ECC processing circuit described above starts correction processing in response to the occurrence of an ECC error, as schematically shown in FIG. 5B, after reading the entire data area of the sector n. . However, since the ID information is being searched at this point, the ID information that has just been read must be stored in the data buffer 211 or stored in the pattern register 164 or the like.

Next, the magnetic head moves to sector n + 1 (50
The data of 2) will be read. At this point in time, since the ECC correction of the ID information of the previous sector n is in progress, the ID information of the sector n + 1 is compared with the expected value n + 2 prepared in advance in the drive I / F control unit 160, and there is no match. Recognize. Of course, sector n + 1 also has ID
ECC of FIG. 1 to check the ECC error of some parts.
The data section check is performed in the unused second ECC processing circuit in the processing section 213.

Here, since an ECC error occurs in the data of sector n + 1 as well, after reading sector n + 1,
Although the ECC error of the ID information is not detected by the ECC processing unit 213, it can be considered as a CRC check miss. Therefore, as schematically shown in FIG. 5D, the ECC correction processing is performed by the second ECC processing circuit described above. I do. This sector n
When +1 is read, the ID information in sector n is n + 2 because the correction of the ID information in sector n by the first ECC processing circuit is completed, as schematically shown in FIG. I know.

Therefore, it is found that the sector to be read next by the magnetic head 101 is n + 2, and the reading process of the corresponding sector is executed. Here, since the first ECC processing circuit is free, the ECC check of the read data of the sector n + 2 can be performed by utilizing this. At this time, the second
The ECC processing circuit of is performing the ECC error correction calculation of the sector n + 1. 5 (C) and (E),
The operation of the first and second ECC processing circuits described above is schematically shown when no error occurs in each read sector.

In this way, the on-the-fly correction by the error occurrence of the ID information of the first embodiment of the format pattern of FIG. 2 in which the ID information is arranged in the data section can be realized. Therefore, according to the present embodiment, the ID that is important in the disk device without causing the deterioration of the data processing speed.
ECC correction can be performed on information, and the reliability of the disk device is improved. Here, it is assumed that the ECC correction operation can be corrected at most half the sector transit time of the head after the end of reading the relevant sector. Of course, it is necessary to increase the number of ECC processing units according to the maximum ECC correction time. Further, it goes without saying that it is necessary to store the read ID information in the required number for ECC correction.

Next, a second embodiment of the format pattern according to the device of the present invention will be described. FIG. 6 is a diagram showing a second embodiment of the format pattern according to the device of the present invention.
The same components as those in FIG. 2 are designated by the same reference numerals. The format pattern of this embodiment is the servo area 60 of each sector.
1 is characterized in that it has ID information and information indicating the address of the sector is put in the servo area 601.

In FIG. 6, each sector 102 comprises a servo area 601 and a data area 602. The servo area 601 contains ID information 603, and the data area 6
No header and CRC are included in 02. That is,
As shown in FIG. 6B, the data portion 604 in the data area 602 is SY for synchronizing the circuit following the gap area GAP1 for absorbing the rotational fluctuation of the magnetic disk.
NC1 area, AM1 area, user data area and EC
It consists of C area. Subsequent to the data portion 604, PAD areas and gap areas GAP2 are arranged in this order.

As described above, the servo area 601 is hidden in the GAP1 and GAP2 areas, and it is not necessary for the user to disclose it. Servo information in the servo area 601 is, as shown in FIG. 6C, an ISG1 area for fixing the amplitude value of the reproduction signal by the AGC, and a DC for indicating the timing for the circuit to know the start of the position information. Era
Area, an AM area in which a code for generating a pulse indicating the start of a sector is recorded, and a 10-byte long area in which the cylinder number CYL, head number HD, and sector number SECT of this sector are arranged. Has been. The data in this area is recorded in gray code having the structure shown in FIG. 6D so that at most one cylinder will be read even if it is misread.

Following this, there is a burst field. This burst field has the same structure as the conventional one, and has four-phase patterns POSA to POSD for identifying a slight deviation from the track of the magnetic head.
There is an MA area before and after these signals for taking a discharge time of the circuit. This is followed by a 2-byte long ISG2 area indicating the end of the servo area.

The format pattern of this embodiment is shown in FIG.
Similarly to the format pattern of the first embodiment shown in
Since the information for identifying the sector is recorded, the data processing speed does not deteriorate, and it is possible to prevent the data destruction of another sector due to the abnormality of the mechanical control unit. Further, in this embodiment, FIG.
As shown in (C), since the servo area 601 includes ID information (CYL, HD, SECT), the format efficiency is compared with the format of FIG.
It looks like this:

Formatting efficiency of the second embodiment of FIG. 6 = (520/665) × 100 = 78.2%. ． ． (3) Conventional format efficiency of FIG. 12 = (520/718) × 100 = 72.4%. ． ． (4) Therefore, it is understood that the present embodiment improves the format efficiency by about 6% (53 bytes / sector is released) as compared with the prior art.

Further, in this embodiment, since the sector information exists in the servo area 601, a value exists regardless of whether the data is read or written. Especially when writing data in multiple sectors continuously (this is called multi-sector write), when the sector servo system is adopted as described above, sector information can be confirmed for each sector.
Therefore, the same reliability as that of the conventional format having the ID part can be obtained.

As a result, according to this embodiment, although the data processing speed is equivalent to that of the conventional format pattern, the format efficiency can be improved, and the sector information can be stored even in the multi-sector write. Since data can be written while checking, a highly reliable disk device adopting a format method can be realized.

Incidentally, in the split servo system, which is often used at present in small disk devices of 2.5 ″ or less, sectors and servo areas do not have a one-to-one correspondence.
In this case, when the head of the next sector (index pulse, sector pulse) is recognized, the method of associating with the ID information recorded in the servo area may be adopted. Alternatively, a method of recording the number of distances (good byte clock) to the beginning of the next sector together with the ID information in the servo area may of course be used.

Further, in the present embodiment, as shown in FIG. 6C, 3 bytes of AM in the servo area 601 are prepared, but 1 byte out of this is whether an index pulse or a sector pulse is output. Used for the code to determine. Here, by expanding this area so that the sector number can be generated, it is not necessary to record the sector number in a gray code in the servo area.

Next, a third embodiment of the format pattern according to the device of the present invention will be described. FIG. 7 is a diagram showing a third embodiment of the format pattern according to the device of the present invention.
The same components as those in FIG. 6 are designated by the same reference numerals. The format pattern of the present embodiment is characterized in that it has ID information in both the servo area 601 and the data area 701 of each sector 102, and information indicating the address of the sector is put in both the servo area 601 and the data area 701. is there.

As shown in FIG. 7A, each sector 102
Consists of a servo area 601 and a data area 701,
Servo area 601 includes ID information 603.
Similar to the second embodiment in FIG. 6, in this embodiment, the data area 701 further includes ID information. That is, the data portion 702 in the data area 701 is
As shown in (B), following the gap area GAP1 for absorbing the rotation fluctuation of the magnetic disk, the SYNC1 area, the AM1 area for synchronizing the circuit, the header 704, and CR.
It consists of a C area, a user data area and an ECC area.
Subsequent to the data portion 702, the PAD area and the gap area GAP2 are arranged in this order.

That is, the present embodiment is a format in which the formats of both the embodiments of FIG. 2 and FIG. 6 are combined, and the effect of the first embodiment that the ECC correction of the ID part is possible and the multi-sector write are confirmed. It is possible to have the effect of the second embodiment that can be done while doing so.

In this embodiment, the ID information is the servo area 601.
And the data area 701, the format efficiency is as follows when compared with the format of FIG.

Format efficiency of the third embodiment of FIG. 7 = (520/672) × 100 = 77.3%. ． ． (5) Conventional format efficiency of FIG. 12 = (520/718) × 100 = 72.4%. ． ． (6) Therefore, it is understood that the format efficiency of the present embodiment is improved by about 5% (46 bytes / sector is released) as compared with the prior art.

As a result, according to the present embodiment, the data processing speed is equivalent to that of the conventional format pattern, the format efficiency is improved, and the data writing is performed while confirming the sector information even in the multi-sector write. Since it is possible to correct the ECC of the ID part,
It is possible to realize a disk device that adopts a highly reliable format system. In addition, it goes without saying that the content of each sector information in this embodiment can be freely selected depending on the design policy of the disk device.

Next, a fourth embodiment of the format pattern according to the device of the present invention will be described. FIG. 8 is a diagram showing a fourth embodiment of the format pattern according to the device of the present invention.
The same components as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. The format pattern of the present embodiment is a data surface servo system and is a format pattern that can be applied to a disk device when the split data surface servo system is adopted. Of the servo area 301 of each sector 102 and the data area 801, the format pattern of the header The feature is that an ECC code area is provided immediately after.

As shown in FIG. 8A, each sector 102
Is composed of a servo area 301 and a data area 801.
As shown in FIG. 8C, the servo area 301 has the same structure as that of the first embodiment shown in FIG.

On the other hand, in the data area 801, as shown in FIG. 8B, the data section 802 includes ID information 803, and the ID information 803 includes a header 804.
A first ECC code area is provided immediately after the header 804, and a second ECC code area is provided immediately after the user data area. Accordingly, when an error occurs in the read information of the header 804, the header information can be corrected by the first ECC code reproduced from the first ECC code area. Therefore, according to the present embodiment, it is possible to avoid the worst case in which the user data cannot be read normally because the header information cannot be read.

Further, since an error has occurred in the header information despite the reading of the relevant sector, the method of reading the sector again after waiting for one rotation after confirming the address of the header after the correction is completed, results in a transfer efficiency. bad. However, in the present embodiment, in the case of a hardware configuration capable of on-the-fly correction of header information, even if an error is added to the header information at the time of data reading, the user data is read and temporarily stored in the buffer. The sector address can be specified, and the transfer efficiency can be improved.

Note that unlike the present embodiment, E is added to the header information.
Even if the CC code is not added, when the error of the header information occurs at the time of data reading, it is possible to predict the sector address of the header in which the error occurred from the normal header information of the sector before the corresponding sector. .

However, since it is meaningful to confirm the final address by reading the header information from the magnetic disk, if the header value is not confirmed as the read value of the magnetic disk as described above, all the header information is removed and the data surface is deleted. It is better to include the following sector information in the servo information. This is because there is a sector pulse at the beginning of the sector, which is called the hard sector system, and is common nowadays as high-density recording advances.

Here, since the sector pulse is made from the data surface servo information and the split servo system is adopted, the distance between the head of the sector and the servo information on the magnetic disk is not constant.

Therefore, in order to recognize where the head of the sector is from the servo information, a means for recognizing on the circuit is required. That is, the fact that the head of the next sector is known from the servo information makes it easy to specify the number of the next sector. Of course, the sector address may be specified by this method. In this method, the address of the next sector is obtained from the servo information by the CPU, and information such as normality, failure, and alternation of this sector is read out from the memory and judged, and it is possible to judge what state the next sector is. It will be one solution.

Next explained is a fifth embodiment of the format pattern according to the device of the present invention. FIG. 9 is a diagram showing a fifth embodiment of the format pattern according to the device of the present invention.
The same components as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. The format pattern of this embodiment is a format pattern that can be applied to a disk device when the split data surface servo system is adopted, and of the servo area 301 and the data area 901 of each sector 102, the user data area in the data area 901. The feature is that a header 904 is provided immediately after.

As shown in FIG. 9A, each sector 102
Is composed of a servo area 301 and a data area 901.
The servo area 301 has the same configuration as that of the first embodiment shown in FIG. 2, as shown in FIG. On the other hand, the data area 90
1 has an ID in the data portion 902, as shown in FIG.
Information 903 is included.

The above-mentioned ID information 903 includes a header 904 as shown in FIG. 9 (B). The header 904 is provided immediately after the user data area provided subsequent to the SYNC1 area and the AM1 area.

As a result, in the present embodiment, it is possible to determine whether or not an error has occurred in the header information from the header 904 at the end when the data read from the user data area is stored in the data buffer 211 at the time of data reading. it can. As a result, even if the header information is added to the data buffer 211 at the end of the user data, the next user data overwrites the previous header information if the confirmation of the header is completed before the reading of the next sector. By controlling so that the data can be properly arranged in the data buffer 211, it becomes easy to transfer the data to the host computer 215.

Alternatively, the user data may be stored in the buffer and the header information may be stored in the register of the data processing unit 151. According to the present embodiment, the operation sequence at the time of reading data does not become the processing of reading data while determining the header as described with reference to FIG. 3, so the design of the command sequencer unit 163 is simplified. There is an effect.

By the way, the above is an example of a disk device having a single magnetic head, but the present invention can be applied to a disk device having a dual head. FIG. 10 is a format pattern diagram of an embodiment of a disk device of the present invention equipped with a dual head.

As described with reference to FIG. 13, the format pattern of the disk device equipped with the dual head has the read ID part and the write ID part independently, so that the ID can be confirmed even during multi-sector write. Can write data. Here, in this embodiment,
The structure of the servo area shown in FIG. 10 (C) is the same as the conventional one, but the sector format is as shown in FIG. 10 (B).
By arranging 01, the user data area having a length of 520 bytes is not changed and the entire length is made 725 bytes.

As a result, as compared with the conventional case, the read ID
It is possible to reduce the number of copies and to perform the ECC correction of the read ID information. Further, in this embodiment, since the read ID portion does not exist, the format efficiency is as follows when compared with the conventional format pattern of 1 sector 848 bytes long shown in FIG.

Format efficiency of the embodiment of FIG. 10 = (520/725) × 100 = 71.7%. ． ． (7) Conventional format efficiency of FIG. 13 = (520/848) × 100 = 61.3%. ． ． (8) Therefore, it is understood that the present embodiment improves the format efficiency by about 10% (relatively releasing 123 bytes / sector) as compared with the prior art.

As a result, similarly to the other embodiments, the data processing speed of this embodiment is equivalent to that of the conventional format pattern, the format efficiency is also improved, and multi-sector write and ECC correction of ID information are possible. A disk device equipped with a dual head can be realized.

The present invention is not limited to the above embodiments, but controls peripheral devices such as a floppy disk device and an optical disk device, or a connection cable between a host computer and a drive, or a peripheral device. It can also be applied in a controller such as a host computer for doing so. That is, the present invention can be applied to an optimum location of each system in a series of data processing systems from the host computer to the peripheral device. And
Needless to say, the functions may be incorporated in the LSI to realize the above functions.

[0127]

As described above, according to the present invention,
The address information area that was previously formed on the disk-shaped recording medium so that it cannot be rewritten by normal data writing is eliminated, and the address of the sector is read by the address information that can be read first in the corresponding track where the head is located. Since it is possible to identify immediately, it is possible to prevent the deterioration of the data transfer rate such as one track waiting for an index pulse in the worst case, and it is possible to improve the format efficiency by about 5%.

Further, according to the present invention, the address information can be read out immediately by arranging and recording the address information in the data section, so that the data transfer efficiency is improved as compared with the conventional case. It is possible to improve the format efficiency.

Further, according to the present invention, the address information is arranged and recorded in the servo information servo information used for positioning the head on the disk-shaped recording medium so that the address information cannot be rewritten at the time of recording. Even when writing, user data can be written while checking the address of the sector. Furthermore, since the recording area of the address information can be eliminated, the format efficiency can be improved.

Further, according to the present invention, the address information is arranged and recorded in each of the data section and the servo information, and the same address information is reproduced twice when the data is read, so that the address information is reproduced. Since it is possible to check the address information, it is possible to improve the reliability of reading the address information, and it is possible to eliminate the address information area that was previously formed so that it could not be rewritten. It can be further improved.

Further, according to the present invention, in the disk device equipped with the integrated dual head, the address information area for writing is made independent as in the conventional case, and cannot be rewritten by normal data writing on the disk-shaped recording medium. In order to eliminate the previously formed read address information area as described above, the address of the sector can be immediately identified by the address information from the data section that can be read first in the corresponding track in which the head is located. When writing data, check the sector number as before,
Multi-sector write can be realized, and deterioration of the data transfer rate can be prevented when reading data.

Further, according to the present invention, the address information area for reading which has been previously formed so as not to be rewritten can be eliminated, so that the format efficiency can be improved by about 10% as compared with the conventional case. .

Further, according to the present invention, an error detection code for detecting an error in the address information is added to the address information and recorded so that the error in the address information can be detected, or the address information is exclusively used. Since the error correction code of No. 1 is added to the address information and recorded to enable error correction of the address information, the reliability of the read address information can be ensured.

Further, according to the present invention, by having the address information in the data part, adding an error correction code including the address information and the data part, and recording in the data part,
Since error correction can be performed by including the address information as well as the user data in the data part, the address information can be judged after storing the read user data in the buffer, and the next user data is overwritten with the address information in the buffer. This allows the user data to be stored and arranged in the buffer cleanly, which is suitable for data transfer to the host computer.

Furthermore, according to the present invention, the position of the address information is shifted so that the sector indicated by the address information in the data part is read out after the maximum error correction time in the error correction code in the data part. Since the on-the-fly correction due to the occurrence of an error in the address information is realized by recording the address information, it is possible to correct the error in the address information without degrading the data processing speed. Can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a disk device according to the present invention.

FIG. 2 is a first format pattern according to the device of the present invention.
It is a figure which shows an Example.

FIG. 3 is a flow chart for explaining an operation when reading the data of the format pattern of FIG. 2 by the device of the present invention.

FIG. 4 is a flowchart for explaining an operation when writing data of the format pattern of FIG. 2 by the device of the present invention.

5 is an explanatory diagram of the operation of the device of the present invention when the format pattern of FIG. 2 is corrected on-the-fly.

FIG. 6 is a second format pattern according to the device of the present invention.
It is a figure which shows an Example.

FIG. 7 is a third format pattern according to the device of the present invention.
It is a figure which shows an Example.

FIG. 8 is a fourth format pattern according to the device of the present invention.
It is a figure which shows an Example.

FIG. 9 is a fifth format pattern according to the device of the present invention.
It is a figure which shows an Example.

FIG. 10 is a format pattern diagram of an embodiment of a disk device equipped with the dual head of the present invention.

FIG. 11 is a block diagram of an example of a conventional disk device.

FIG. 12 is a diagram showing an example of a format pattern by a conventional device.

FIG. 13 is a format pattern diagram of an example of a disk device equipped with a conventional dual head.

[Explanation of symbols]

101 ... Magnetic head, 102 ... Sector, 103, 601
... Servo area, 111, 602, 701, 801, 90
1, 1000 ... Data area, 112, 604, 702,
802, 902 ... Data section, 113, 603, 703,
803, 903, 1001 ... ID information, 114, 70
4, 804, 904 ... Header, 150 ... Disk device,
151 ... Data processing unit, 160 ... Drive I / F control unit, 162 ... Data transfer unit, 163 ... Command sequencer unit, 164 ... Pattern register, 165 ... CHS
F (cylinder head sector flag) register, 2
09 ... Central processing unit (CPU), 211 ... Data buffer, 213 ... ECC processing unit, 215 ... Host computer.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masatoshi Nishina 2880 Kozu, Odawara, Kanagawa Stock Company Hitachi Storage Systems Division (72) Inventor Shoichi Miyazawa 1099 Ozenji, Aso-ku, Kawasaki, Kanagawa Hitachi, Ltd. Manufacturing Systems Development Laboratory

Claims (10)

[Claims] 1. A disk device for recording and reproducing a data portion containing desired data on a disk-shaped recording medium by a head in units of sectors through a gap, and reproducing the address information indicating the addresses in units of the sectors. A disk device comprising recording means for recording on a disk-shaped recording medium. 2. The recording means arranges and records the address information in the data section.
The disk device described. 3. The recording means sequentially records servo information used for positioning the head and the data portion in each sector on the disk-shaped recording medium, and records the address information in the servo information. The disk device according to claim 1, wherein the disk device is arranged and recorded. 4. The recording means sequentially records servo information used for positioning the head and the data section in each sector on the disk-shaped recording medium, and records the address information in the data section and in the data section. 2. The disk device according to claim 1, wherein the disk information is arranged and recorded in each of the servo information. 5. A data section containing desired data is recorded on a disk-shaped recording medium in a sector unit via a gap, and a first recording area of address information in a sector unit for recording and for reproduction. In the disk device, the second recording area of the address information of each sector and the third recording area of the reproduced data portion are recorded by the recording head and the recording information is reproduced by the reproducing head. A disk device comprising recording means for arranging address information indicating an address in sector units for use in a disk-shaped recording medium by arranging the address information in the data part. 6. The disk device according to claim 1, wherein the recording means sequentially records the address information in each sector following the data section. 7. The recording means adds the error detection code for error detection of the address information to the address information and records the address information.
The disk device according to any one of the above. 8. The disk device according to claim 1, wherein the recording means adds an error correction code dedicated to the address information to the address information for recording. 9. The recording means has the address information in the data part, adds an error correction code including the address information and the data part, and records in the data part. Item 1. The disk device according to item 1. 10. The recording means shifts the position of the error correction code in the data section so that the sector indicated by the address information in the data section is read after the maximum error correction time. The disk device according to claim 1, wherein the disk device records.