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Clock extraction method for patterned medium, clock extraction circuit for patterned medium and patterned medium

A clock extraction and patterning technology, applied in recording/reproducing/deleting methods, patterned record carriers, different record carrier forms, etc., to solve problems such as matching, not realizing the location of clock signals and magnetic dots, etc.

Inactive Publication Date: 2008-03-26
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In general, however, for disk devices utilizing patterned media, no method of matching the clock signal to the location of the magnetic dots has been implemented.

Method used

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  • Clock extraction method for patterned medium, clock extraction circuit for patterned medium and patterned medium
  • Clock extraction method for patterned medium, clock extraction circuit for patterned medium and patterned medium
  • Clock extraction method for patterned medium, clock extraction circuit for patterned medium and patterned medium

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Embodiment Construction

[0041] Preferred embodiments of the present invention are described below by referring to the accompanying drawings. FIG. 1 is a diagram showing the structure of a patterned medium 11 according to a first embodiment.

[0042] Figure 1 shows a patterned medium 11 and its partial enlarged views 11a and 11b. The patterned medium 11 is characterized in that it has: a plurality of tracks 12 in the form of a plurality of concentric circular patterns, each of which is arranged at constant intervals; data for writing and reading locations; and data area 14 .

[0043] The data area 14 is characterized by a magnetic portion 16 in which a plurality of magnetic dots 15 for recording magnetic signals are arranged at certain intervals, and a nonmagnetic portion 17 in which no magnetic dots 15 exist ( That is, no magnetic signal is recorded in this nonmagnetic portion 17). The method of manufacturing the patterned medium 11 can utilize conventional manufacturing methods.

[0044] The pat...

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Abstract

Aimed at is to match a timing of a clock signal with a magnetic dot of a patterned medium. A magnetic part (16) arraying magnetic dots (15) for recording a magnetic signal at certain intervals and a nonmagnetic part (17) not recording a magnetic signal are featured in the patterned medium. A position of the nonmagnetic part(17) not recording a magnetic signal is detected by a magnetic head and a clock signal is synchronized with a detection signal of the nonmagnetic part.

Description

technical field [0001] The present invention relates to a clock extraction method using a patterned medium, a clock extraction circuit for the patterned medium, a magnetic disk device, and the patterned medium. Background technique [0002] A patterned medium having a magnetic dot pattern corresponding to a data bit has a feature of making the recording density higher than that of a hard disk composed of a magnetically continuous film. [0003] The patterned medium requires magnetic dots to be formed at predetermined intervals, and also requires the surface of the magnetic dots to be flat so that the magnetic dots are flush with the surface of the medium substrate. Thus at the end of the production process of the media it is conventionally necessary to have a polishing process called chemical mechanical polishing in order to make the surface of the magnetic dots flat. [0004] Patent Document 1 points out a method of omitting the chemical mechanical polishing process in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/00G11B5/00
CPCB82Y10/00G11B5/59616G11B5/743G11B2220/2516G11B20/14G11B5/855G11B5/746G11B5/85G11B5/65G11B5/02
Inventor 和泉晴彦
Owner FUJITSU LTD
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