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Magnetic disc device and servo signal recording mode

The technology of a magnetic disk device and recording method is applied in the directions of magnetic recording, recording/reproducing/deleting methods, data recording, etc., and can solve problems such as inability to locate components

Inactive Publication Date: 2004-09-29
HITACHI GLOBAL STORAGE TECH JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, when recording a clock track using a recent magnetic head with a narrower element width of several hundreds of nm, there is a possibility that the element cannot be positioned on the clock track due to thermal deformation, etc. A rewrite of the action this suspense

Method used

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  • Magnetic disc device and servo signal recording mode
  • Magnetic disc device and servo signal recording mode
  • Magnetic disc device and servo signal recording mode

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Embodiment Construction

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0024] It should be noted that in all the drawings used to describe the embodiments, the same symbols are used for parts having the same functions, and repeated descriptions are omitted.

[0025] The present invention relates to a method of generating a reference clock (or a reference clock) used as a timing reference when recording a servo pattern.

[0026] figure 1 It is a perspective view showing a schematic configuration of a magnetic disk device according to an embodiment of the present invention.

[0027] It should be pointed out that in figure 1 In general, a frame cover is installed on the upper part of the frame body 101 to seal the internal components, but in figure 1 In the figure, the state with the case cover removed is shown for easy observation of the components.

[0028] The magnetic disk device of the present embodiment includ...

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PUM

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Abstract

A magnetic disk apparatus capable of generating a reference clock signal without using an external reference by writing a clock track only once using a head of the magnetic disk apparatus even if the head is of a read / write element separation type. Using the head of the magnetic disk apparatus, a clock track is recorded only once and the recorded clock track is played back to measure the total number of clock bits in one revolution. A time interval between servo sectors is determined by dividing the total number of clock bits thus measured by the number of servo sectors. By using as a timing reference the clock bits produced by playing back the clock track, the servo sectors are recorded in such a manner that they are located at the determined interval.

Description

technical field [0001] The present invention relates to a magnetic disk device and a servo signal recording method, and particularly relates to a servo writing operation for recording a reference clock signal used as a timing reference without using a dedicated clock head when recording a servo signal in a magnetic disk device such as a hard disk device. Background technique [0002] In a magnetic disk device, in order to detect the position of the magnetic head, several tens to one hundred or more servo signals (servo sectors) are arranged on the recording surface per one turn. [0003] In the usual servo writing step, for example, in JP-A-2000-123509, in order to specify the circumferential position of each servo sector, a clock track is usually recorded on the recording surface with a dedicated head called a clock head, And by reproducing it, a clock signal for detecting the rotational position of the disk is obtained (for example, refer to Patent Document 1). [0004] O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B21/10G11B5/09G11B5/596
CPCG11B5/09G11B5/59633G11B21/10
Inventor 安那啓草茅洋一山口高司堀崎誠杉山謙一郎
Owner HITACHI GLOBAL STORAGE TECH JAPAN LTD