KR100421337B1 - Recording medium which records gray code section having track information read error verifying information and reading device thereof - Google Patents

Abstract

PURPOSE: A device for reading track information read error verifying information is provided to record a gray data detect confirming area in a gray code area of a servo area, thereby improving a wrong operation caused when gray data is incorrectly read. CONSTITUTION: A CPU(32) outputs various initial values for detecting servo information and data information. A servo sector synchronous coincidence circuit(16) reads an SAM(Servo Address Mark) from encoded read data, and generates a reference pulse for generating a servo timing. A gray synchronous signal decoder(18) and a counter circuit(20) decode gray synchronous signals to output the signal, generates an FGRAY even though one of the gray synchronous signals is lost, and applies the FGRAY to the CPU(32). A gray data decoder(22) generates a gray data detect window, reads gray data to decode the gray data, and applies the gray data to the CPU(32). A gray read error verifying data decoder decodes gray read error verifying data. A comparator compares the gray data with the gray read error verifying data, generates an FGRAY(Fault Gray) if the compared data are not identical, and applies the FGRAY to the CPU(32).

Description

A recording medium in which a gray code section having track information read error verification information is recorded,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to servo detection of a hard disk drive, and more particularly, to a recording medium for improving a gray code reading apparatus in which track information is recorded in a servo area and a reading apparatus therefor.

In general, an example of a disk drive recording apparatus is a floppy disk drive, a hard disk drive, or the like. The disk is divided into tracks concentrically from the center of the disk, and each of the tracks is divided into a servo sector and a data sector. In the servo sector, servo information for reading or writing data on a target track is recorded according to the servo pattern, and the data sector represents an area in which data transmitted from the host computer is recorded. A servo address mark (hereinafter referred to as SAM) for providing a synchronization point of servo information detection is recorded at the starting point of the servo sector. In the SAM area, a unique pattern which is not normally used in the servo sector and the data sector is written. There is a gray code area behind the SAM area to inform the ID information of each track. The gray code region has a characteristic of being able to easily grasp a pattern change by a change of one bit. Finally, a track search to the target track or a burst area, which is information for tracking the head on the track when the track is tracked, is recorded.

A method of detecting the gray code will be described.

First, the hard disk driver outputs window signals for setting a sampling interval for detecting servo information and data information such as a gray code, a burst, etc. in synchronization with the detection timing of the SAM. Then, when the gray code is correctly detected in the gray code detection window area, it is converted into a binary code and transmitted to the CPU. At this time, the gray code area is recorded in the servo area as shown in FIG. The gray code area is recorded in the same format as the second code, and includes a gray-sync area for providing a sync signal for generating a detection left arrow for detecting a gray data area, (gray-date) area.

At this time, if the number of gray motions is n, and one of them is counted at the time of reading, it is determined that the gray data of the specific servo sector is defective and the FGRY (fault gray) information is transmitted to the CPU. However, the FGRY is not generated when the gray data is read out without performing the gray synchronization, but it is not possible to judge an error that occurs when defect information or a signal occurred on the disk is unstable. That is, for example, if gray data values that are not in the FGRAY but are read in the m servo areas in the track following mode on the target track are all the same, in the above case, an incorrect value, that is, ID information of another track, I will inform you. Therefore, a repetitive operation to retry the target track is performed again, resulting in a non-effective problem.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a recording medium and a reading device thereof for improving a malfunction occurring when a gray data detection confirmation information area is recorded in a gray code area in a servo area and gray data is erroneously read.

According to an aspect of the present invention, there is provided a disk recording medium for a hard disk drive having a plurality of tracks including a servo sector and a data sector,

A synchronization signal section in which a synchronization signal is recorded,

A track information section for providing information on each track in synchronization with the synchronization signal,

And a verification data recording section for verifying the presence or absence of the track information read error.

Hereinafter, a detailed description will be given with reference to FIGS. 3 and 4 of the present invention and a block diagram of a reading device of FIG. 5.

FIG. 3 is a recording format of a servo area according to an embodiment of the present invention,

A gray code having a track information section for informing the ID information of each track following the SAM band and the track information lead error verification information recording section; And a servo area having a burst information recording section, which is information for tracking the target track or tracking the head on the track when tracking the track, is provided on a single track.

FIG. 4 is a record format of a gray code section according to an embodiment of the present invention,

The track information read error verification information is obtained by adding a final exclusive-or gated value to the value of the existing gray data (3, 2, 1, 0) after the gray data Quot; 0 "and the radix track is recorded as" 1 ".

FIG. 5 is a block diagram of an apparatus for reading track information read error verification information according to an embodiment of the present invention,

An HDA (Head Disk Assembly) 10 is composed of a head for writing or reading predetermined data on a disk and a disk used as a recording medium and rotating at a constant speed by driving a spin stone motor. The preamplifier 12 connected between the HDA 10 and the read / write channel circuit 14 amplifies the detected signal from the head and outputs the amplified signal to the preamplifier 12 and the servo sector synchronous matching circuit 16 The connected read / write channel circuit 14 receives data to be written under the control of the CPU 22, encodes the data, and outputs the encoded data to the head. Further, the read / write channel circuit 14 decodes the signal detected from the head into Encoded Read Data (ERD) and outputs the decoded signal.

The servo sector synchronizing circuit 16 detects the servo synchronizing signal in the ERD inputted from the read / write channel circuit 14 and outputs it in synchronism with the system clock. The servo synchronizing signal is supplied to the gray synchronous signal decoder 18, the gray data decoder 22), the gray lead error verification data decoder 26 is enabled.

The gray sync signal decoder 18 decodes the gray sync signal recorded on the disk and applies the decoded gray sync signal to the gray data decoder 22. The gray sync signal is counted by the sync counter 20, Disables the generation of the next gray data detection window at the time of sewing, and transmits the FGRAY to the CPU 32. [

The gray data decoder 22 generates a gray data detection window according to a sync signal supplied from the gray synchronous signal decoder 18 and generates a gray data detection window in which gray data (track information) Decodes it, converts it into a binary code, and transmits it to the CPU 32. [ At this time, the CPU 32 applies the gray data to the comparator 28 again.

The gray lead error verification data decoder 26 decodes the gray lead error verification data recorded on the disk and outputs it to the comparator 28.

The comparator 28 compares the gray data supplied from the CPU 32 with the verification data supplied from the gray lead error verifying data decoder 26 to generate FGRAY when different, send.

In conclusion, FGRAY is generated and output by the following two cases.

First, a SAM is detected through the servo sector synchronous coincidence circuit to detect on the disk when the gray synchronous signal decoder 18, the gray data decoder 22, the gray lead error verification data decoder 26 are enabled The gray sync signal read out by the gray sync signal decoder 18 is counted by the sync count 20 and the gray data is decoded by the Gray data decoder 22, And the Gray Read Error Verification Data Decoder 26, the comparator 28 compares the Gray Read Error Verification data with the Gray Read Error Verification data and generates and outputs FGRAY to the CPU 32 when the same is not the same.

According to the present invention as described above, gray data read error verification information is recorded in the gray code area in the servo area, thereby improving the malfunction caused when the gray data is erroneously read.

FIG. 1 is a format for recording a gray code section and a burst section in the conventional servo area.

Figure 2 also shows the format of a gray code recorded on a number of conventional tracks.

FIG. 3 is a recording format of a sub-area according to an embodiment of the present invention; FIG.

FIG. 4 is a recording format of a gray code section according to an embodiment of the present invention; FIG.

FIG. 5 is a block diagram of an apparatus for reading track information read error verification information according to an embodiment of the present invention; FIG.

Claims (3)

A disk recording medium of a hard disk drive having a plurality of tracks each composed of a servo sector and a data sector, A synchronization signal section in which a synchronization signal is recorded, A track information section for providing information on each track in synchronization with the synchronization signal, And a verification data recording section for verifying the presence or absence of the track information read error. 2. The data recording apparatus according to claim 1, And a " 0 "excellent track is recorded as a" 1 "odd numbered track. A reading apparatus for a recording medium in which a gray code section having track information read error verification information is recorded, A controller for sweeping an overall control operation of the disk drive and outputting various initial values for detecting servo information and data information in synchronization with the detection timing of the SAM; A servo sector synchronous matching circuit for detecting a SAM from the encoded read data synchronized with the system clock and generating a reference pulse for servo timing generation in response to the SAM, And a control unit for controlling the gray-sync signal to be applied to the control unit by generating an FGRAY when the gray-sync signal is enabled by the servo sector synchronization coincidence circuit and counting the gray-sync signal recorded on the recording medium and counting the decoded gray- A synchronous signal decoder and counter circuit, A gray data detecting window is generated by the synchronous signal applied from the gray synchronous signal decoder and the counter circuit, which is enabled by the servo sector synchronous coincidence circuit, and gray data recorded on the disk in the detection window area A gray data decoder for reading and decoded and applying the decoded data to the control unit, A gray lead error verify data decoder enabled by the servo sector sync match circuit to decode and output gray lead error verify data recorded on the recording medium; And a comparator for comparing the gray data output from the control unit with gray lead error verification data output from the gray lead error verification data decoder to generate FGRAY if the gray data is not the same and applying the same to the control unit.