KR100255204B1 - Data Sector Split Gap Compensation Disk Device and Compensation Method of Disk Drive System - Google Patents

Abstract

Adopting the uniform high density recording method in the disk drive system improves the occurrence of data errors due to AGC malfunction due to data sector division gaps appearing between adjacent data sectors.

To this end, after setting all the sections between the servo sectors as data sectors for the disks in which the recording of the servo sectors is completed, the pseudo data is recorded in all the sections of the set data sectors in a low level format.

Therefore, normal AGC operation is performed by removing no-signal interval from data sector to prevent data error.

Description

Data Sector Split Gap Compensation Disk Device and Compensation Method of Disk Drive System

1 is a sector shape and a frame structure diagram of a multiple data recording method.

2 is a schematic configuration diagram of sector information of a multiple data recording method.

3 is a block diagram of a disk drive device for carrying out the present invention.

4 is a flowchart of one embodiment of a data sector division gap compensation function according to the present invention.

5 is a configuration diagram of sector information according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive system, and more particularly to a disk drive system that compensates for a data sector split gap (DSG) appearing between adjacent data sectors in a disk drive system of a uniform high density recording method. An apparatus and a compensation method thereof are provided.

In general, a disc drive system for recording and / or reproducing data using a disc as a recording medium is widely used as an auxiliary memory device of a computer system because it can process a large amount of data at high speed. In the disc drive system, the disc is accessed in units of sectors. The sector is roughly divided into a servo sector and a data sector for servo.

In general, the disk drive system employs a uniform high density recording method in order to increase the recording capacity of the disk. Examples of the uniform high density recording method include a multiple data rate recording method, a zone bit recording method, a constant density recording method, and the like. The uniform high density recording method realizes high recording density by making the number of data sectors different according to the position of the disk to make the BPI (Bit Per Inch) of the disk uniform.

FIG. 1 is a diagram showing a sector shape and a frame structure of a multiple data rate recording method. An example of dividing a disc's zone into three first-third areas Z1-Z3 is shown.

FIG. 2 is a diagram showing the configuration of sector information of the multiple data recording method. FIG. 1 shows the configuration of sector information in the third region Z2.

3 is a block diagram of a disk drive apparatus of a multiple data recording method, in which the read / write processing unit 20 controls the head 10 to record data on the disk or to reproduce data from the disk. At this time, the read / write processing unit 20 performs an AGC (Auto Gain Control) to stabilize the signal, thereby keeping the amplitude of the read signal constant. The DC gap detection unit 30 determines whether the servo sector starts from the output signal of the read / write processing unit 20. The DC gap detection unit 30 detects the DC gap section of FIG. 2 recorded in the servo sector area and outputs an ERD signal. The decoder 40 decodes the ERD signal to generate sector shape signal C2-CO and cylinder address signal G11-GO. The sector detection unit 50 receives the sector type signal C2-CO to determine the location of the data sectors set as shown in FIG. 1 at the location of the corresponding data sector and the index pulse IDX or data sector corresponding to each sector type. Generate a pulse STR. The controller 60 controls the overall operation of the disk drive apparatus under the control of the host computer through the host interface, and receives the data sector pulse STR or the index pulse IDX from the sector detector 50 to determine the data sector position on the disk. .

1 to 3 are disclosed in detail in patent application no. 92-0000 filed in 1992 by the same applicant as the present applicant.

The uniform high density recording method will be briefly described as an example of the multiple data rate recording method with reference to Figs. First, FIG. 1 shows an arrangement in which four servo sectors of one frame are used. The data sectors are equally divided regardless of the circumferential direction or the centrifugal direction of the disk so that the BPI is uniform during data recording. . For convenience, the first to third regions Z1 to Z3 include a second region Z2 having four data sectors equal to the number of servo sectors, a third region Z3 having five data sectors greater than the number of servo sectors, and a servo sector. An example of dividing by the first region Z1 having three data sectors less than the number is given. Therefore, each data sector has almost the same size irrespective of its position on disk, so that a uniform BPI can be obtained.

Also, in FIG. 1, TO, T1, T2, and T3 are timer signals indicating the start position of the next data sector, and are programmed in advance to the controller 60 with values corresponding to the first area Z1 to the third area Z3, respectively. . When the servo sector and the data sector are separately configured as shown in FIG. 1, the sector information code C2-CO, which is the start position information of the next data sector, is recorded in the servo sector of FIG.

Accordingly, the sector detection unit 50 receives the values of TO, T1, T2, and T3 from the control unit 60 according to the main index and each sector type using the sector type code C2-CO, and corresponds to the data sector corresponding to the corresponding area. Generate a pulse. That is, the sector detection unit 50 determines the location of the next data sector when receiving information of the servo sector, and generates a data sector pulse when the head is positioned at the location of the data sector. Therefore, the controller 60 recognizes the start of the data sector when receiving the data detection pulse, thereby controlling the write operation of the BPI at the time of data writing. As a result, the data drive can be set variably so that the BPI can be kept constant regardless of the arrangement of the servo sectors in the disk drive, and the control unit 60 decodes the sector type codes recorded at the positions of the servo sectors. It can determine the data sector according to.

On the other hand, in FIG. 2, identification (ID) in the data sector is a sector ID or data address mark recorded in the zone bit recording method, the constant density recording method, and the like, instead of the multiple data rate recording method, and the servo information for the corresponding data sector. Becomes

When the disc is formatted in the disc drive system of the uniform high density recording method as described above, the position of the next data sector is set in advance as described above. That is, in the case of the multiple data rate method, it is set as timer signals TO, T1, T2, and T3. In addition, the data units recorded in one data sector are also preset in advance. The data unit is set to 512 bytes, for example.

As a result of the transient time, hundreds of data are not recorded immediately after the data sector is written to one data sector when the disk is formatted, and no signal is recorded between adjacent data sectors as shown in FIG. A DSG of about ns appears. However, even in this case, the AGC is operated in the read / write processing unit 20, so that the gain of the AGC is increased so that the data of the next data sector or the signal of the ID or data address mark becomes unstable. Therefore, a data error occurs.

As described above, in the conventional disk drive system of the uniform high density recording method, a data error occurs due to the DSG appearing between adjacent data sectors.

Accordingly, an object of the present invention is to provide a DSG compensation disk device and a compensation method thereof that can solve the above problems.

Another object of the present invention is to provide a DSG compensating disk device capable of preventing data errors from occurring by recording pseudo data in a DSG section.

Another object of the present invention is to provide a DSG compensation method capable of preventing a data error from occurring by recording pseudo data in a DSG section.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The block diagram of the disc drive device for carrying out the present invention is the same as in FIG. 3 and the same reference numerals are used.

4 is a flowchart of an embodiment of a DSG compensation function according to the present invention, in which all of the timer signals TO, T1, T2, and T3 indicating the start position of the next data sector are set to “O”, and the servo sector is recorded. A low level format is performed by the timer signal. The flowchart of FIG. 4 shows an example of DSG compensation for the multiple data rate recording method and is used by programming it into a host computer.

FIG. 5 is a block diagram of setter information according to the present invention. FIG. 5 (a) shows that pseudo data PD (Psuedo Data) is recorded in all the regions except for the DC gap between servo sectors. FIG. As shown in FIG. 5 (a), a normal format is performed on a disk recorded therein, indicating that PD has recorded pseudo data for gap compensation in a DSG between adjacent data sectors.

Hereinafter, with reference to FIGS. 3 to 5 attached to an operation example of the present invention will be described in detail.

First, in the disk drive system of the uniform high-density recording method, the pseudo data PD is recorded in a low level format by setting all the sections between the servo sectors as data sectors before the normal format of the disks in which the servo sectors are recorded. will be. The pseudodata PD refers to a data signal of a random random pattern. If the normal format is performed after the pseudo data PD is recorded as described above, the data setter is overwritten so that the normal format is performed and the pseudo data PD remains in the DSG section. Therefore, the no signal section disappears from the data sector, thereby preventing data errors due to malfunction of the AGC.

Compensating DSGs as described above will be described taking an example in the case of applying the multiple data rate recording method. In response to the user's input of the DSG compensation format command, the host computer storing the program according to the flowchart of FIG. 4 may include timer signals TO, T1, T2, and the like stored in the control unit 60 of FIG. 3 in step 401 of FIG. Set all T3 to "O". Next, in step 402, the low level format is performed on the disc on which the recording of the servo sector is completed. Then, under the control of the control unit 60, the read / write processing unit 20 records the pseudo data PD between all the servo sectors as shown in FIG. 5 (a).

Subsequently, if the disk recorded as shown in FIG. 5 (a) has a normal format, the data sector is overlapped as shown in FIG. 5 (b) so that a normal format is performed, and the pseudo data PD remains in the DSG section. Therefore, since no signal section disappears in the data sector, normal AGC operation is performed so that no data error occurs. In addition, in the above state, when the disk is accessed, the transient time as described above occurs, so that the pseudo data PD recorded in the DSG section is not accessed. Therefore, no data error occurs due to the pseudo data PD of the DSG interval.

As described above, the present invention has the advantage that data errors can be prevented from occurring by recording the pseudo data in the DSG section in the disk drive system of the uniform high density recording method.

Claims (4)

A disk device of a disk drive system, comprising: a plurality of areas divided according to the circumference of a disk, a track consisting of n frames, a frame consisting of m servo sectors, and data according to the size of the area to which the frame belongs. Data sectors each having a different number assigned to the corresponding frame area so that the recording intervals of the data sectors have the same size, and pseudo data intervals in which pseudo data is recorded in the data sector division gap periods between the data sectors. Sector Split Gap Compensation Disk Device. 2. The apparatus of claim 1, wherein the regions are located in an outer circumferential portion of the disk and include a first region in which more data sectors are arranged than the number of servo sectors; Data sector partitioning comprising: a second area in which the same number of data sectors is arranged; and a third area in which the number of data sectors is located in the central portion of the disc and smaller than the number of servo sectors. Gap Compensation Disk Unit. A data sector split gap compensation method of a disk drive system comprising the steps of: setting all sections between servo sectors as data sectors for a disk in which recording of the servo sectors is completed, and performing a low-level format to all sections of the set data sectors. A data sector split gap compensation method of a disk drive system, characterized by recording pseudo data. A data sector division gap compensation method of a disk drive system of a multiple data rate recording method, comprising: setting all timer signals indicating the start position of the next data sector to a "O" for a disk on which a servo sector has been recorded, and a low level; And formatting the pseudo data in all sections of the data sector set by the timer signal set to " O " to format the data sector.