KR100241737B1 - Disc media having servo address mark check pattern and servo pattern recording method - Google Patents

Abstract

A servo pattern recording method is disclosed that can prevent a SAM detection error informing the start of a servo area. The present invention includes the steps of recording a servo address mark pattern for synchronizing the detection timing of servo patterns recorded in the servo area, and following the servo address mark pattern, at least two or more recording states are checked for checking the detection of the servo address mark pattern. Recording the provided servo address mark check bit pattern in an alternate recording state with an adjacent servo area along a predetermined track; and writing an index pattern indicating a reference position of the track following the servo address mark check pattern; And following the index pattern, recording an address pattern indicating the track position of the servo area, and following the address pattern, recording a burst pattern for following the head on the target track of the disc recording medium. .

Description

Disc recording medium and servo pattern recording method having a servo address mark check pattern

1 is a block diagram of a general hard disk drive to help understand the present invention.

2 is a servo pattern recording state diagram according to the conventional servo pattern recording method.

3 is a recording state diagram of a servo pattern recorded on a predetermined track of a disc according to a conventional servo pattern recording method.

4 is a recording state diagram showing a servo pattern recording state showing servo pattern recording and a detection timing of some servo patterns according to a preferred embodiment of the present invention.

Fig. 5 is a recording state diagram showing the recording state of a servo pattern recorded on a predetermined track of a disc and the detection timing of some servo information according to the present invention.

6 is a recording state diagram showing in detail an example of recording of a check bit pattern shown in FIG.

7 is a state diagram of a record classification table of check bits in accordance with a preferred embodiment of the present invention.

8 is a recording state diagram showing a state in which check bit patterns according to the present invention are alternately recorded on the disc in the circumferential direction with respect to the main index area.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc drive recording apparatus, and more particularly, to a disc recording medium and a servo pattern recording method for recording respective servo patterns representing servo information of a disc for reading or writing data on a disc.

Generally, examples of the disk drive recording apparatus may include a floppy disk drive, a hard disk drive, and the like.

The disc is track-divided concentrically from the center of the disc, and each track-divided area is divided into a servo area and a data area, and servo information for reading or writing data at a desired position in the servo area of the disc recording medium. Are recorded according to the corresponding servo pattern.

1 is a block diagram of a general hard disk drive to help understand the present invention. A microprocessor (10) controls the overall operation of the hard disk drive.

The head 20 performs a horizontal motion on the disk 30 as a recording medium and detects data on the disk 30.

The actuator 40 is generally used with a voice coil motor (VCM), and is connected to the head 20 to drive the head 20 horizontally on the disk 30.

The spindle motor 50 rotates by connecting the disk 30 to the drive shaft.

A VCM driver 60 is connected to the actuator 40 and controls the driving of the actuator 40 under the control of the microprocessor 10.

The spindle motor controller 70 is connected to the spindle motor 50 and controls the driving of the spindle motor 50 under the control of the microprocessor 10.

The interface controller 80 is connected to the microprocessor 10 and transmits and receives data with an external data input device (not shown).

The read / write channel part 90 receives data to be written from the interface controller 80 under the control of the microprocessor 10 and encodes the analog data into an analog flux change signal to output the head. 20), and the analog detection signal input from the head 20 is decoded into encoded read data (hereinafter abbreviated as ERD) and output.

The gate array 100 receives an ERD from the read write channel unit 90, detects a servo pattern from the ERD, and provides a window signal or timing clock for data input / output, decoding, and encoding of each component. Create and output

2 is a servo pattern recording state diagram according to the conventional servo pattern recording method in the above-described servo area of the disk, wherein the servo area is recorded at the start point of the servo area to indicate a synchronization point of servo information detection (Servo Address Mark). (Hereinafter referred to as SAM) pattern, an index pattern for indicating the start position of the track, an address pattern for recording the position of the servo area in gray code, and following the head on the target track. It consists of a burst pattern and the like.

Among the above-described recording areas, the SAM area is generally a DC gap section, also called a servo start mark, a sector mark, or a servo gap. The above-described disk drive recording apparatus generates and outputs window signals for determining a sampling period for detecting servo patterns and data information such as index, address, and burst in synchronization with the detection time of the SAM.

3 is a recording state diagram of a servo pattern recorded on a predetermined track of a disc according to the conventional servo pattern recording method.

Hereinafter, the conventional servo pattern recording method will be described in detail with reference to the above-described configuration of FIG. 1 and the state diagrams of FIGS. 2 and 3.

First, the conventional disk recording apparatus records a SAM pattern at the start position of the servo region on each track of the disc 20 as shown in FIG. 2, and writes an index pattern indicating the start position of the track after the corresponding SAM pattern. After the index pattern, an address pattern indicating the position of the servo region in gray code is recorded, and a burst pattern for following the head on a target track is recorded.

Thereafter, the SAM pattern is detected to generate a SYNC signal, which is a sampling synchronization signal of the servo region. The gate array 100 generates servo timing signals based on the SYNC signal to detect each servo pattern in the servo region. In addition, the disk drive recording apparatus detects the SAM pattern in the N servo area to generate the SYNC signal to detect the N servo area, and predicts the recording position of the SAM pattern in the N + 1 servo area located after a predetermined interval based on the N + 1 SAM. The pattern is also detected.

However, in the conventional servo information recording method, since only the SAM pattern is recorded to achieve detection synchronization of each servo pattern in the servo area, there is a problem that a SAM detection error occurs when noise occurs in the SAM pattern detected from the servo area.

In addition, when the servo information recording pattern is externally affected and a part of the pattern is damaged or a recording pattern such as SAM occurs in the data area, there is no way to check the wrong pattern.

Accordingly, an object of the present invention is to provide a servo pattern recording method capable of preventing a SAM detection error informing the start of a servo region in a disk drive recording apparatus.

Another object of the present invention is to provide a SAM pattern recording method capable of preventing a SAM detection error informing the start of a servo area in a disc drive recording apparatus.

It is still another object of the present invention to provide a disc recording medium having a SAM check pattern capable of preventing a SAM detection error informing the start of a servo area.

The present invention for achieving the above object is a servo pattern recording method on a disc recording medium divided into a servo area and a data area, the method comprising: recording a SAM pattern for synchronizing the detection timing of servo patterns recorded in the servo area; And following the SAM pattern, recording a SAM check bit pattern having at least two recording states in a recording state alternate with an adjacent servo area along a predetermined track to check detection of the SAM pattern; Recording an index pattern indicating a reference position of a corresponding track following the SAM check pattern, recording an address pattern indicating a track position of the servo area following the index pattern, and following the address pattern, Recording a burst pattern for following the head on the target track of the disc recording medium Consists of steps.

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

4 is a recording state diagram showing the servo pattern recording state showing the servo pattern recording and the detection timing of some servo patterns in the servo region on the disk, alternately with the data region on each track of the disk. The servo region divided into: a SAM pattern for synchronizing the detection timing of each servo pattern recorded in the servo region; A SAM check bit pattern having at least two bits or more check bits to check detection of the SAM pattern, recorded in a recording pattern alternating with an adjacent servo region along a predetermined track, and the SAM check bit following the SAM pattern; After the pattern, an index pattern indicating the start position of the track, an address pattern indicating the track position of the servo area following the index pattern, and a burst pattern for following the head on the target track following the address pattern. Configure.

5 is a recording state diagram showing the recording state of the servo area and the recording state of the SAM check bit recorded on a predetermined track of the disc according to the present invention.

FIG. 6 is a recording state diagram showing in detail an example of recording of the SAM bit pattern shown in FIG.

7 is a state diagram of a recording classification table of a SAM check bit pattern according to an exemplary embodiment of the present invention.

8 is a recording state diagram in which a SAM check bit pattern is recorded in a circumferential direction with respect to a servo area including a main index pattern on a disc according to an embodiment of the present invention, and is based on a servo area including a main index pattern. SAM check bit patterns of '01' and '10' are alternately recorded in each servo area.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the above-described configuration of FIG. 1 and FIGS. 4, 5, 6, 7 and 8.

First, the disc drive recording apparatus records the SAM pattern at the start position of each servo area on each track of the disc. After that, the check bit pattern of the servo area is recorded after the corresponding SAM pattern. At this time, as shown in FIG. 5, the SAM check bit pattern is alternately recorded with data of 01 and 10 after the SAM pattern of the corresponding servo area.

That is, as an example, in the recording state of FIG. 5, if the SAM check bit pattern is recorded as 10 in the N servo area, the SAM check bit pattern is recorded as 01 in the next servo area N + 1 servo area and 01 in the N + 2 servo area. The SAM check bit pattern is recorded as 10. The reason why the above-described SAM check bit pattern is alternately recorded is to detect the SAM check bit pattern of the N + 1 SAM after detecting the N SAM and before detecting the N + 1 SAM.

The structure of the SAM check bit pattern is as shown in FIG. 6, and the SAM check bit pattern includes a first sync bit S-bit1 for detecting successively written check bit 1 CB1, and the check. Bit 1 (CB1), a second synchronization bit (S-bit2) for detecting successively written check bit 0 (CB0), and the check bit 0 (CB0).

The above-described SAM check bit pattern is composed of two bits of data. For example, 01 represents an odd sector, and 10 represents an even sector, as in the record classification table of the check bit shown in FIG. ). In addition, as shown in FIG. 8, the SAM check bit pattern is alternately recorded in adjacent servo regions based on the main index servo region including the main index pattern.

When the SAM of the N + 1 servo area according to the present invention recorded as described above is detected and compared with the SAM check bit pattern of the N servo area predicted, the SAM is regarded as normally detected.

In each servo area, the recording state of the SAM check bit pattern should be recorded alternately as shown in FIG. 5, and if it is not alternately recorded, the SAM pattern of the N + 1 servo area cannot be considered valid.

In addition, the SAM check bit pattern is preferably used as a recording pattern of '01' and '10', and does not use '00' and '11' recording patterns. Therefore, when the normal SAM pattern is detected, the '00' and '11' recording patterns are not detected as the SAM check bit pattern. If the '00' and '11' recording patterns are detected, the SAM pattern is erased or the SAM It can be seen that a detection error occurs because noise occurs in the pattern recording portion or when AGC adjustment is poor.

Therefore, as described above, the present invention records the SAM check bit pattern in each servo region, and predicts the SAM check bit pattern of the next servo region in advance from the SAM check bit pattern detected in the current servo region, and then SAM pattern of the next servo region. After detection, the SAM check bit pattern of the corresponding servo area can be compared to increase the reliability of SAM detection.

Claims (6)

A servo pattern recording method on a disc recording medium divided into a servo area and a data area, comprising the steps of: recording a servo address mark pattern for synchronizing the detection timing of servo patterns recorded in the servo area; Subsequent to the servo address mark pattern, a servo address mark check bit pattern having at least two recording states for recording the detection of the servo address mark pattern is recorded as a recording pattern alternate with an adjacent servo area along a predetermined track. Steps; Recording an index pattern indicating a reference position of a corresponding track, following the servo address mark check pattern; Subsequent to the index pattern, recording an address pattern representing a track position of the servo area; And recording a burst pattern for following the head on a target track of the disc recording medium, following the address pattern. 2. The method of claim 1, wherein the recording state of the servo address mark check bit pattern is a pattern writing state indicating an odd-numbered servo region with respect to the predetermined servo region, and an even-numbered servo region with reference to the predetermined servo region. A servo pattern recording method of a disc drive recording apparatus, characterized by comprising a pattern recording state. A servo address mark recording method for synchronizing the detection of a servo pattern in a servo area on a disc recording medium divided into a servo area and a data area, the method comprising: recording a servo address mark pattern for synchronizing the detection timing of servo patterns recorded in the servo area Making a step; Subsequent to the servo address mark pattern, a servo address mark check bit pattern having at least two recording states for recording the detection of the servo address mark pattern is recorded as a recording pattern alternate with an adjacent servo area along a predetermined track. A servo address mark pattern recording method of a disc drive recording apparatus, characterized by comprising a step. 4. The method of claim 3, wherein the recording state of the servo address mark check bit pattern is a pattern writing state indicating an odd-numbered servo area with respect to the predetermined servo area, and an even-numbered servo area with respect to the predetermined servo area. A servo address mark pattern recording method of a disc drive recording apparatus, characterized by comprising a pattern recording state. A disc recording medium divided into a servo area and a data area, comprising: a servo address mark pattern for synchronizing detection timing of respective servo patterns recorded in the servo area; Subsequent to the servo address mark pattern, an address mark check bit pattern having at least two recording states for checking the detection of the servo address mark pattern is recorded in an alternate recording pattern with an adjacent servo area along a predetermined track. And a disc recording medium of the disc drive recording apparatus. 6. The method according to claim 5, wherein the recording state of the servo address mark check bit pattern is a pattern writing state indicating an odd-numbered servo region with respect to the predetermined servo region, and an even-numbered servo region with reference to the predetermined servo region. A disc recording medium of a disc drive recording apparatus, characterized by comprising a pattern recording state.