JP2823615B2 - Disk storage device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage device using a storage disk such as a magnetic disk, an optical disk, and a magneto-optical disk, and more particularly, to a disk control LSI.

[Prior Art] FIG. 7 shows a configuration of a conventional storage device using a storage disk (hereinafter, referred to as a disk device).

1, the disk device 10 includes a disk control device 8 and a disk drive device.

The disk drive device includes an encoding / decoding circuit 6 for encoding data into a storage code on the disk and decoding the storage code, and a recording / reproduction circuit 7 for recording / reproducing to / from the storage disk. Are a host interface circuit 2 for interfacing with the host computer, a disk control LSI 3 for controlling the transfer of data accessed by the host computer, a buffer memory 4 for holding data to be transmitted to and received from the host computer, and a microprocessor 5 for controlling the entire system. It has.

In the disk device described above, data transmission / reception between the disk control device and the disk drive device has been performed by two serial data of read and write.

Therefore, the disk control LSI used in the disk control device has one serial data interface for each of read and write, and handles each data as serial data.

[Problems to be Solved by the Invention] However, in recent years, disk devices adopting the parallel recording method have been developed in order to increase the data transfer speed.

In this disk drive, if the control is to be realized with only one conventional disk control LSI, the data between the disk control LSI and the disk drive must be serial data, and the data transfer is sufficient. The speed could not be increased.

Further, if an attempt is made to use a plurality of disk control LSIs, the processing of the microprocessor that controls the disk control LSIs becomes excessively large, and the hardware becomes large-scale. There has been a problem that it becomes difficult and the cost increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk control LSI for a disk device adopting a parallel recording method, which can increase the data transfer speed of the disk device with one LSI.

In addition, another object of the present invention is to provide a disk device capable of increasing the data transfer speed, and an information processing system using the disk device.

Means for Solving the Problems To achieve the above object, the present invention provides a host interface for inputting / outputting data accessed by a host device, and a disk for inputting / outputting storage data to / from a storage disk in parallel. There is provided a first disk control LSI, comprising: an interface; and means for controlling data transfer between the two interfaces.

In order to achieve the above object, a host interface for performing input / output of data accessed by a host device in parallel, a disk interface for performing input / output of storage data to / from a storage disk in parallel, and a data interface between the two interfaces are provided. A means for controlling the parallel transfer and a code for detecting an error in the transfer data are obtained in units of parallel data, parallelized to the same number of bits as the transfer parallel data, and added to the transfer parallel data from the host interface to the disk interface. Means for detecting an error in the transfer data from a code for detecting an error in the transfer data added to the parallel data transferred from the disk interface to the host interface. Provide a disk control LSI.

In particular, the present invention provides a disk control LSI characterized by using a Reed-Solomon code as a code for detecting an error in the transfer data in the second disk control LSI. In addition, each disk control L
It is preferable that the SI includes means for outputting sector management information of the storage disk to be written to the storage disk in parallel with the number of bits of the transfer parallel data from the disk interface.

In addition, the present invention provides a first disk device comprising a storage disk and the disk control LSI for controlling the parallel transfer of data to and from the storage disk.

In order to achieve the above object, the present invention provides a buffer memory for holding parallel data accessed by a host device, a disk control circuit for controlling parallel transfer of data between the buffer memory and the storage disk, and a storage device for the storage disk. An encoding / decoding circuit for encoding data to a recording code on a storage disk and decoding from the recording code;
And a storage disk for storing storage data in parallel.

In addition, the present invention also provides an information processing system including the disk device and a host device accessing the disk device.

As described above, in the present invention, the data lines between the disk control device and the disk drive device are parallelized. In addition, when there is a circuit that handles data serially even at one place in the LSI, all of these internal circuits have a parallel configuration with respect to the data lines in order to impair the high-speed operation.

Regardless of the LSI, if the characteristics of the hardware configuration of the disk device are expressed, it is possible to encode a recording code to a disk drive device or to perform a decoding operation when reading data (a host computer and a disk). This is equivalent to the fact that all of the data lines are implemented by a circuit having a parallel configuration.

[Operation] According to the first disk control LSI of the present invention, input / output of storage data of the storage disk is performed as parallel data by the disk interface. Data transfer between the host interface and the disk interface is performed.

According to the second disk control LSI of the present invention, data accessed by the host device is input / output in parallel at the host interface, and storage parallel data of the storage disk is input / output in parallel at the disk interface. The data between the two interfaces is transferred in parallel. On the other hand, a code for detecting an error in the transfer data is obtained in units of parallel data, parallelized to the same number of bits as the transfer parallel data, and added to the transfer parallel data from the host interface to the disk interface.

Further, an error of the transfer data is detected from a code for detecting an error of the transfer data added to the parallel data transferred from the disk interface to the host interface.

In the second disk control LSI, it is preferable to use a Reed-Solomon code as a code for detecting an erroneous drop of the transfer data.

Further, it is preferable that each of the disk control LSIs outputs the sector management information of the storage disk to be written to the storage disk in parallel with the number of bits of the transfer parallel data from the disk interface.

According to the first disk device of the present invention, the disk control LSI controls the parallel transfer of data to and from the storage disk.

According to the second disk device of the present invention, the buffer memory holds the parallel data accessed by the host device. Further, the data transfer between the buffer memory and the storage disk is performed as parallel data by the disk control circuit. The encoding / decoding circuit encodes data stored in the storage disk into a recording code on the storage disk and decodes the data from the recording code.

According to the information processing system of the present invention, the host device accesses the disk device and performs the processing.

[Embodiment] An embodiment of the present invention will be described below using an information processing system including a magnetic disk storage device as an example.

First, a storage format of the disk device according to the present embodiment will be described.

First, FIG. 8 shows a storage format of a conventional disk device for serially recording data.

As shown in the figure, the disk device records data in units of sectors 17 on the magnetic disk. Each sector 17 includes data (DATA FIELD) 29 sent from the host computer 1 and error correction. Sign (DATA CHECK BYT
ES) In addition to 30, information for managing the sector 17 must be written. This information includes ISG (inter-sector gap) inserted between each sector,
There are an address 18, a synchronization pattern 28, and the like for each sector. Writing this information is called formatting.

As described above, in the conventional case where data is serially recorded, a sector having a certain sector number exists as a continuous area on the disk, but in the present embodiment, the data is recorded in parallel. A plurality of sectors having sector numbers exist on the disk at a distance. Since these sectors must be accessed simultaneously as one sector for management, this must be taken into account when formatting.

FIG. 5 shows a storage format of a disk device for recording parallel data according to the present embodiment.

In the present embodiment, as shown in the figure, the data field 29 and the ECC bytes 30a to 30c are written separately into a plurality of sectors 17a, b, and c having the same sector number. Is a signal used for synchronizing data reading at the time of recording / reproducing, and if it is written separately, data cannot be read. In addition, ISC (inter-sector gap) 20a ~
c is necessary for each sector according to the sector length.
Therefore, these pieces of information are independently added to each sector on the disk.

According to the above configuration, data can be correctly reproduced even in storing data patterns.

As described above, in the configuration shown in FIG.
Although only the data field 29 and the ECC byte 30 are written separately to b and c, the address field 23 and the address check byte 24 (see FIG. 8) in the address area are also written in each sector 17a, b, You may make it distribute and write to c.

Configuration of Disk Device Next, the configuration of the disk device according to the present embodiment will be described.

FIG. 1 shows a configuration of a disk device according to the present embodiment.

The disk device 10 includes a disk control device 8 and a disk drive device.

The disk drive device includes an encoding / decoding circuit 6 for encoding data into a storage code on the disk and decoding the storage code, and recording / reproduction circuits 7a, 7b,... For recording / reproduction on / from the magnetic disk. I have. A magnetic head is connected to each recording / reproducing circuit, and each magnetic head accesses the same or different magnetic disks in parallel.

The disk control device 8 includes a host interface circuit 2 serving as an interface with a host computer, a disk control LSI 3 described later, a buffer memory 4 holding data to be transmitted / received to / from the host computer, and a microprocessor 5 controlling overall control. .

At the time of normal data writing, the disk drive 9 transfers the pattern data received from the disk control LSI 3 to a plurality of sectors 17 on the formatted disk.
Recording is performed in parallel on a, b, and c (sectors having the same sector number, see FIG. 5).

At this time, it is necessary to encode / decode the data into a recording code for recording on the disk. In this embodiment, the encoding / decoding circuit 6 uses the disk control LSI to keep the data parallel. Receiving and encoding / decoding processing in parallel (2-7 RLL code, 1-
There are many known recording codes, such as 7RLL codes, which make the circuit configuration simpler when converting parallel data).

However, the encoding / decoding circuit 6 may include encoding / decoding circuits for the number of output data lines of the disk control LSI.

As described above, the disk device according to the present embodiment stores data in parallel on a magnetic disk.
Unlike the conventional disk device 8 that stores data serially (see FIG. 6), a bus is connected between the encoding / decoding circuit 6 and the disk control LSI 3 to transmit and receive data in parallel.

Internal Configuration of Disk Control LSI Next, a disk control LSI according to the present embodiment will be described.

FIG. 2 shows the configuration of the disk control LSI according to this embodiment.

The disk control LSI includes a CPU interface unit 12, a buffer controller unit 13, a host interface unit 11, a drive interface unit 15, a format control unit 50, an EC
It comprises a C section 14.

The CPU interface unit 12 includes the attached microprocessor 5 for controlling the entire disk controller 8 and the present LSI.
Interface circuit with microprocessor 5 and book
Controls the transfer of data and addresses to and from the LSI.

The buffer controller 13 is a circuit that controls a buffer memory provided to absorb a difference in data transfer speed between the disk drive 3 and the host computer 1. All data transfer between the disk drive 3 and the host computer 1 is performed via the buffer memory 4. Therefore, data transfer controlled by the buffer control unit 13 is performed by the disk drive device 13.
-A buffer memory 4 and a buffer memory 4-At least two systems of the host computer 1 are required, and the microprocessor 5 and the buffer memory 4 may be present in some cases.

The host interface controller 11 is a disk control LSI 3
And a circuit for controlling data transfer of the host interface control circuit 2 and handles signals between the host interface control circuit 2 and the disk control LSI 3.

The ECC unit is a circuit that generates and decodes an error correction code for correcting data errors caused by noise, defects in a recording medium, and the like when recording and reproducing data sent from the host computer 1 to a disk device. is there. Conventionally, a fire code is usually used as an error correction code of a hard disk device. However, in the case of a fire code, when a decoding circuit is realized by hard logic, it is necessary to store the data as serial data, so that a parallel configuration cannot be used. Therefore, in the present invention, data is handled in a parallel configuration using, for example, a Reed-Solomon code described in JP-A-63-91418 as an error correction method.

The drive control unit 15 is a circuit that controls the transfer between the disk control LSI 3 and the encoding / decoding circuit 6, and includes a format control unit 50.

The format control unit 50 is a circuit that controls a format in which sector management information necessary for writing and reading data and a synchronization signal used in a recording / reproducing circuit when reading data are written. The disk device must perform this format when used for the first time. Since the data to be written at this time is not data sent from the host computer, the microprocessor 5 and the format control unit 50 generate data according to the storage format described above (see FIG. 5) for each sector, and Write.

When writing the data sent from the host computer 1 to the disk device, the data 29 sent from the host computer is added to the information (26) of the error correction code 3 generated by the ECC unit and the other data area 19. , 27, 2
8, 31) must be added. The format control unit 50 also adds the information.

Next, a disk control LSI according to the present embodiment is compared with a conventional disk control LSI that stores data serially.
The features of the configuration of FIG.

 FIG. 7 shows a conventional disk control LSI configuration.

As shown, the conventional CPU interface unit 12
The data was handled in parallel in the buffer control unit 13. However, since the ECC part is a circuit configured to handle serial data, the parallel-serial conversion part 16 converts the data to serial, then the ECC part generates an error correction code and sends it to the drive control part .

On the other hand, the disk control LSI according to the present embodiment employs the Reed-Solomon code in the ECC unit and handles data in parallel.

In addition, the drive control section has a parallel configuration and LS
I treat the data as parallel.

The ECC unit has a parallel-serial conversion circuit in the drive control unit as a conventional configuration,
The output of the drive control unit can achieve a constant high speed even when the data is configured to be parallel. Regarding the data transfer inside the LSI, even by serial transfer,
This is because while a certain degree of speed can be obtained by increasing the transfer rate, it is difficult to increase the transfer rate with respect to data transfer with the outside of the LSI. That is, LS
This is because it is highly probable that data transfer with the outside of the I will be the rate-determining step of processing, and therefore, by parallelizing the data transfer with the outside of the LSI, the overall processing can be speeded up.

Format Control Unit Next, the internal configuration of the format control unit 50 (see FIG. 2) will be described.

 FIG. 3 shows the configuration of the format control unit 50.

In the figure, reference numeral 51 denotes a sequencer which decodes a command from the microprocessor 5 (see FIG. 1) and controls each section, and 53 denotes ISG data 20a to c for format and various synchronization patterns 28a.
And a register 54 for storing a data pattern / serial conversion and output based on an instruction from the sequencer 51.

FIG. 4 shows the configuration of the drive interface unit 54.

In the figure, 55a, 55b,... Are registers for storing write data, 56 is a selector for performing parallel / serial conversion of the write data, and 57 is a buffer for outputting the data selected by the selector 56.

Hereinafter, the operation of the format control unit 50 during formatting will be described.

First, the microprocessor 5 instructs the sequencer to that effect, and stores the format ISG data 20a to 20c, addresses, various synchronization patterns 28a to 28c, and the like in the register 53. Next, the microprocessor 5 instructs the sequencer 51 to execute the format.

In response, the sequencer 51 sequentially reads IS
G data 20a-c, addresses and various synchronization patterns 28a-c
Etc. to the dry interface unit.

The drive interface unit outputs this to the disk drive unit. However, since it is necessary to add the ISG data 20a to c and various synchronization patterns 28a to c to each sector as described above, each bit of the selector 56 By sequentially selecting and outputting the bits of the input data, the selector 53 serializes and outputs the data from the register 53.

With the above operation, the ISG data 20a to 20c and various synchronization patterns 28a to 28c can be added to each sector. Also, normal storage data and the like can be stored in parallel by outputting without serialization.

Instead of the parallel / serial conversion, the microprocessor 5 may store in advance the negative data in the register 53 such that the bit string of each digit forms desired data.

Hereinafter, the normal operation of the disk device will be described.

When writing data, the host computer 1 uses SCSI (Small Computer Syste
m Interface) to host interface control circuit 2
Sends a write command to the

The disk drive 9 positions the magnetic head at the target sector 17 according to the command received via the host interface control circuit 2.

Thereafter, the host computer sends the stored data. This data is parallel data of 1 byte width.
The stored data is transferred from the host interface control circuit 2 to the buffer memory 4 by the buffer control unit 13 of the disk control LSI.
Is forwarded to

The ECC unit 14 inside the disk control LSI adds 12 bytes of Reed-Solomon code, which is an error correction code, to this data, and transfers it to the encoding / decoding circuit 6 via the drive control unit 15 as parallel data of 1 byte width. I do.

The encoding / decoding circuit 6 converts the recording code into a 1-7 PLL code or the like, and converts the data into the sectors 17a, b, and c corresponding to the addresses specified by the write command on the disk by the recording / reproducing circuits 7a, b having a plurality of systems. Write each bit.

At the time of reading data The host computer 1 sends a read command to the host interface control circuit 2 from SCSI or the like. The disk drive device 9 stores the magnetic heads (plurality) in sectors (plurality) 17a, b, and c corresponding to the address of the data specified by this command received via the host interface control circuit 2.
Position.

The recording / reproducing circuits 7 corresponding to these magnetic heads simultaneously read data from a plurality of sectors 17a, 17b, 17c, and the encoding / decoding circuit 6 corrects data skew between the recording / reproducing circuits. Decode to a parallel NRZ signal. The disk control LSI 3 receives this data, performs error detection in the ECC unit 14, and if there is an error, performs error correction in the microprocessor 5 based on error information from the ECC unit 14. If there is no error, the data is transferred to the buffer memory 4 and further transferred to the host computer 1 via the host interface control circuit 2.

As described above, according to the present embodiment, in the disk device, the data lines of the entire disk control device can be configured in parallel. Only speed up.

Further, according to this embodiment, only one LSI for disk control is required, which is a great advantage in terms of cost and mounting area. Also, microprocessor processing is not complicated.

In the above embodiment, the information processing serial having the magnetic disk storage device has been described as an example.
Not only the magnetic disk storage device but also an information processing system including an optical disk or a magneto-optical disk storage device can be similarly realized.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a disk control LSI of a disk device adopting a parallel recording method, which can achieve a high data transfer speed with one LSI.

Further, according to the present invention, it is possible to provide a disk device capable of increasing the data transfer speed, and an information processing system using the disk device.

[Brief description of the drawings]

1 is a block diagram showing a configuration of a disk device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a disk control LSI, FIG. 3 is a block diagram showing a configuration of a format control unit, FIG. 4 is a block diagram showing a configuration of a drive interface unit, FIG. 5 is an explanatory diagram showing a storage format on a disk, FIG. 6 is a block diagram showing a configuration of a conventional disk device, and FIG. FIG. 2 is a block diagram showing a configuration of a disk control LSI according to the related art;
FIG. 8 is an explanatory diagram showing a storage format on a disk according to the prior art. DESCRIPTION OF SYMBOLS 1 ... Host computer, 2 ... Host interface control circuit, 3 ... Disk control LSI, 4 ... Buffer memory, 5 ... Microprocessor, 6 ... Encoding / decoding circuit, 7 ... Recording / reproducing circuit, 8 ... Disk control device, 9 ... Disk drive device, 10 ... Disk device, 11 ... Host interface control unit, 12 ...
... CPU interface section, 13 ... Buffer control section, 14 ... ECC section, 15 ... Drive control section, 16
… Parallel-to-serial converter, 17… Sector, 18… Address area, 19… Data area, 20… ISG (inter-sector gap), 27… Prosync byte, 28…
Sync pattern byte, 29 ... data field, 31 ...
Data pad, 50: Format control unit, 51: Sequencer, 53: Register, 54: Drive interface unit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toru Toru Karasawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Video Engineering Co., Ltd. (72) Inventor Yukito Takada 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi Video Inside Engineering Co., Ltd. (72) Inventor Tetsushi Kawamura 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Microelectronics Equipment Development Laboratory, Hitachi, Ltd. (72) Inventor Yoshio Yukawa 2880 Kozu, Kozu, Odawara-shi, Kanagawa Hitachi, Ltd. Odawara Plant (56) References JP-A-1-91375 (JP, A) JP-A-1-133270 (JP, A) JP-A-1-171160 (JP, A) JP-A-1-85964 (JP, A) U) (58) Fields surveyed (Int.Cl. ⁶ , DB name) G11B 20/10

Claims (31)

(57) [Claims] 1. A disk storage device, comprising: a disk having at least one recording surface; and recording data on the recording surface during a data write operation, wherein the recording is performed during a data read operation. A head that reproduces data from a surface, a disk control unit that outputs parallel data during a data write operation, and receives parallel data during a data read operation; and a head that receives parallel data from the disk control unit during a data write operation. Output encoded data to be recorded on the recording surface by
A disk storage device comprising: an encoding / decoding circuit that receives encoded data reproduced from a recording surface by the head during a data read operation, and outputs the parallel data to the disk control unit. . 2. The disk storage device according to claim 1, wherein said encoding / decoding circuit encodes data using a code requiring at least 2 bits of parallel data for encoding / decoding. / Disk storage device for performing decryption. 3. The disk storage device according to claim 1, wherein said control unit outputs said parallel data to a single path during said data write operation, and said encoding / decoding circuit comprises: A disk storage device for receiving parallel data from said single path. 4. The disk storage device according to claim 1, wherein said disk control unit generates an error correction code as parallel data output from the disk control unit during a part of a data write operation period. The error correction code is used to detect and correct an error in data recorded on the recording surface, and the error correction circuit detects and corrects an error in the parallel data during a data read operation. A disk storage device, characterized in that: 5. The disk storage device according to claim 1, wherein in a data write operation, encoded data is received from said encoding / decoding circuit and encoded data is output to said head, and a data read operation is performed. A disk storage device comprising a circuit for receiving encoded data from the head and outputting encoded data to the encoding / decoding circuit. 6. The disk storage device according to claim 4, wherein said error correction code is generated based on a Reed-Solomon code. 7. The disk storage device according to claim 4, further comprising a buffer memory, wherein said disk control unit reads recording data from said buffer memory for use in generating an error correction code during a data write operation. And a buffer memory control circuit for outputting data to a buffer memory during a data read operation. 8. A disk storage device, comprising: a disk having at least one recording surface; a serial data path; recording data on the recording surface during a data write operation; A head for reproducing data, connected to the recording path and connected to the serial path, a parallel data path, connected to the parallel data path, outputting parallel data to the parallel data path during a data write operation, and reading data; A disk control unit for receiving parallel data from the parallel data path during operation; connecting to the parallel data path; receiving data from the parallel data path during data write operation; An encoding / decoding circuit for outputting encoded data to be recorded, receiving encoded data reproduced from the recording surface by the head during a data read operation, and outputting the parallel data to the parallel data path. The disk storage device according to claim 1, wherein the encoded data passes through a serial data path connected to the head during a data write operation and a data read operation. 9. The disk storage device according to claim 8, wherein said encoding / decoding circuit encodes using a code requiring at least 2 bits of parallel data for encoding / decoding. / Disk storage device for performing decryption. 10. The disk storage device according to claim 8, wherein said parallel data path is a single path for parallel data. 11. The disk storage device according to claim 8, wherein said disk control unit generates an error correction code as parallel data output from the disk control unit during a part of a data write operation period. The error correction code is used to detect and correct an error in data recorded on the recording surface, and the error correction circuit detects and corrects an error in the parallel data during a data read operation. A disk storage device, characterized in that: 12. The disk storage device according to claim 8, wherein said parallel data path has a width of 8 bits. 13. The disk storage device according to claim 8, wherein at the time of a data write operation, encoded data is received from said encoding / decoding circuit and said encoded data is transmitted to said head via said serial data path. And a circuit for receiving encoded data from the head via the serial data path and outputting encoded data to the encoding / decoding circuit during a data read operation. apparatus. 14. The disk storage device according to claim 8, comprising at least one disk having a plurality of recording surfaces, a plurality of serial data paths, and a plurality of recording surfaces respectively associated with the plurality of recording surfaces. A plurality of heads connected to each of the serial data paths, each of which simultaneously records data on a recording surface during a data write operation and simultaneously reproduces data from the recording surface during a data read operation; The decoding circuit receives data from the parallel data path during a data write operation, receives coded data for simultaneous recording on a plurality of recording surfaces by a plurality of heads, and receives a plurality of data by the plurality of heads during a read operation. Coded data simultaneously reproduced from the recording surface of A disk storage device for outputting to a real data path, wherein encoded data passes through the plurality of serial data paths during the write operation and the read operation. 15. The disk storage device according to claim 9, wherein a code used in said encoding / decoding circuit is 1-7RLL.
A disk storage device, which is a code. 16. The disk storage device according to claim 11, wherein said error correction code is generated based on a Reed-Solomon code. 17. The disk storage device according to claim 12, comprising: a buffer memory bus; and a buffer memory connected to the buffer memory bus, wherein the disk controller unit generates an error correction code at the time of a data write operation. A buffer memory control circuit for reading out the recording data used for the reading from the buffer memory via the buffer memory bus and outputting data to the buffer memory via the buffer memory bus at the time of a read operation. A disk storage device, characterized in that: 18. A disk storage device according to claim 17, wherein said disk storage device is connected to an information processing device and said buffer memory bus, receives recording data from said information processing device, and stores said recording data in said buffer memory. And a host interface control circuit for receiving data from a buffer memory via a buffer memory bus and outputting the data to the information processing device. 19. A disk storage device, comprising: at least one disk having a plurality of recording surfaces; a plurality of serial data paths; and a plurality of recording surfaces, each of which is simultaneously recorded during a data write operation. A plurality of heads connected to each of the serial data paths, a plurality of heads connected to each of the serial data paths, and a data line connected to the parallel data path, for simultaneously reproducing data from the recording surface during a data read operation. A disk control unit that outputs parallel data to the parallel data path during a write operation and receives parallel data from the parallel data path during a data read operation; and a disk control unit that is connected to the parallel data path and outputs data from the parallel data path during a data write operation. Receiving encoded data for simultaneous recording on a plurality of recording surfaces by a plurality of heads, and receiving encoded data simultaneously reproduced from a plurality of recording surfaces by the plurality of heads during a read operation. An encoding / decoding circuit for outputting parallel data to the parallel data path, wherein the encoded data is transmitted through a plurality of serial data paths connected to the plurality of heads during a data write operation and a data read operation. A disk storage device characterized by passing through. 20. A disk storage device, comprising: a disk having at least one recording surface; a serial data path; recording data on the recording surface during a data write operation; A head for reproducing data, connected to the recording surface and connected to the serial path, a parallel data path, connected to the parallel data path, and outputting parallel data to the parallel data path during a data write operation; A disk control unit that receives parallel data from a parallel data path during a read operation; and a disk control unit that is connected to the parallel data path and receives parallel data from the parallel data path during a data write operation. An encoding / decoding circuit for outputting data to be recorded on a recording surface, receiving data reproduced from the recording surface by the head during a data read operation, and outputting the parallel data to the parallel data path; The disk storage device according to claim 1, wherein the data passes through a serial data path connected to the head during a data write operation and a data read operation. 21. An error correction circuit according to claim 20, wherein said disk control unit generates an error correction code as parallel data output from the disk control unit during a part of a data write operation period. The error correction code is used to detect and correct an error in data recorded on the recording surface, and the error correction circuit detects and corrects an error in the parallel data during a data read operation. A disk storage device, characterized in that: 22. The disk storage device according to claim 20, wherein said encoding / decoding circuit encodes / decodes using a code requiring at least 2 bits of parallel data for encoding / decoding. / Disk storage device for performing decryption. 23. The disk storage device according to claim 20, wherein said parallel data path is a single path for parallel data. 24. The disk storage device according to claim 20, wherein said parallel data path has a width of 8 bits. 25. The disk storage device according to claim 20, wherein during a data write operation, data is received from said encoding / decoding circuit and data is output to said head via said serial data path; A disk storage device comprising: a circuit that receives data from the head via the serial data path and outputs the data to the encoding / decoding circuit during a data read operation. 26. The disk storage device according to claim 20, comprising at least one disk having a plurality of recording surfaces, a plurality of serial data paths, and a plurality of serial data paths associated with each of the plurality of recording surfaces. A plurality of heads connected to each of the serial data paths, each of which simultaneously records data on a recording surface during a data write operation and simultaneously reproduces data from the recording surface during a data read operation; The decoding circuit receives data from the parallel data path during a data write operation, outputs data for simultaneous recording by a plurality of heads on a plurality of recording surfaces, and performs a plurality of recordings by the plurality of heads during a read operation. Data that has been simultaneously reproduced from the Output to, when the time of the read operation the write operation, the data is a disk storage apparatus characterized by passing said plurality of serial data paths. 27. The disk storage device according to claim 21, further comprising: a buffer memory bus; and a buffer memory connected to the buffer memory bus, wherein the disk controller unit generates an error correction code at the time of a data write operation. A buffer memory control circuit for reading data used for performing the read operation from the buffer memory via the buffer memory bus and outputting data to the buffer memory via the buffer memory bus during a read operation. A disk storage device characterized by the above-mentioned. 28. The disk storage device according to claim 21, wherein the error correction code is generated based on a Reed-Solomon code. 29. The disk storage device according to claim 27, wherein the disk storage device is connected to the information processing device and the buffer memory bus, receives data from the information processing device, and transfers the data to the buffer memory via the buffer memory bus. Output
A disk storage device comprising: a host interface control circuit that receives data from a buffer memory via a buffer memory and outputs the data to the information processing device. 30. The disk storage device according to claim 22, wherein a code used in said decoding / decoding circuit is 1-7RLL.
A disk storage device, which is a code. 31. A disk storage device, comprising: at least one disk having a plurality of recording surfaces; a plurality of serial data paths; and a plurality of recording surfaces, each of which is simultaneously recorded during a data write operation. A plurality of heads respectively connected to each of the serial data paths, a plurality of heads connected to each of the serial data paths, and a data line connected to the parallel data path; A disk control unit that outputs parallel data to the parallel data path during a write operation and receives parallel data from the parallel data path during a data read operation; and a disk control unit that is connected to the parallel data path and outputs data from the parallel data path during a data write operation. Receives, outputs the data to be recorded simultaneously by a plurality of heads in a plurality of recording surfaces, during a read operation,
An encoding / decoding circuit for receiving data simultaneously reproduced from a plurality of recording surfaces by the plurality of heads and outputting parallel data to the parallel data path; A disk storage device, which passes through a plurality of serial data paths connected to the plurality of heads during operation.