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Method and apparatus for detecting SYNC mark in a disk drive

A disc drive, a technology for detecting signals, applied in recording/reproducing/erasing methods, using detectable carrier information, disc-shaped record carriers, etc., can solve problems such as being prone to errors and difficult to improve the accuracy of sync mark position prediction, etc.

Inactive Publication Date: 2004-11-03
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] With the method of detecting the sync mark according to the above prior art document, it is difficult to improve the accuracy of the position prediction of the sync mark due to the rotation variation of the disc medium
Therefore, errors are prone to occur when detecting sync markers

Method used

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  • Method and apparatus for detecting SYNC mark in a disk drive
  • Method and apparatus for detecting SYNC mark in a disk drive
  • Method and apparatus for detecting SYNC mark in a disk drive

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Embodiment Construction

[0022] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0023] figure 1 The block diagram shows the main components of the disk drive according to this embodiment.

[0024] (Structure of readout channel)

[0025] Such as figure 1 As shown in the disk drive, a disk medium 10 as a data recording medium, a read / write head 12, and a read / write channel are provided. The disk medium 10 is rotated by a spindle motor 11. The read / write head 12 has a read head that performs data reading operations on the disk medium 10 and a write head that performs data writing operations on the disk medium 10. The read and write heads are mounted on the same slider and separated from each other.

[0026] The read / write channel is composed of a write channel that performs signal processing on the write data WD, and a read channel that processes the read signal read from the read head to restore the corresponding read data RD.

[0027] The w...

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PUM

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Abstract

A disk drive is disclosed which has a read channel reproducing user data from a data field synchronously with a sync mark detected in binary data obtained from a read signal. The read channel has a SYNC detection unit including a facility to predict the position of the sync mark utilizing the read signal. The SYNC detection unit predicts and detects the position of the sync mark in accordance with a preamble end signal.

Description

Technical field [0001] The present invention generally relates to the field of disk drives, and specifically relates to the detection of sync marks required to restore data. Background technique [0002] Generally, in a disk drive that is generally a hard disk drive, data is recorded on a rotating disk medium through a sector format in units of a data field (data recording area) called a sector. [0003] The sector format relates not only to the data area in which user data is recorded, but also to the sync mark area located near the leading part of the corresponding data area. A data pattern called a sync mark (sync pattern) is recorded in each sync mark area. The sync mark area is used to detect the leading part of the corresponding data area. [0004] In the disk drive, data encoded using a predetermined channel is recorded in each data area. If the read channel is used to restore the data read from the data area, the original user data can be restored by decoding the data whi...

Claims

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Application Information

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IPC IPC(8): G11B5/09G11B20/10G11B20/12G11B20/14G11B20/18G11B27/30
CPCG11B20/1403G11B5/09G11B20/1217G11B27/3027G11B2220/20G11B2020/1287
Inventor 冈本丰赤松学
Owner KK TOSHIBA