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Method of generating timing code for automatic servo write of rotating magnetic disk

A technology of timing code and code shape, which is applied in the direction of aligning tracks on the disk, recording information on the disk, magnetic recording, etc., and can solve problems such as time delay

Inactive Publication Date: 2003-02-26
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause read to write radial correlation time delay

Method used

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  • Method of generating timing code for automatic servo write of rotating magnetic disk
  • Method of generating timing code for automatic servo write of rotating magnetic disk
  • Method of generating timing code for automatic servo write of rotating magnetic disk

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Experimental program
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Embodiment Construction

[0044] Fig. 3 shows a system overview of a self-servo writing device. The system consists of circuit blocks including a radial propagation controller 2 , a timing propagation controller 4 and a pattern generator 6 . The system is connected to a magnetic disk storage device 8 via a read / write transducer 10 and a transmission mechanism 12 that controls the position of the read / write transducer. The disc can be patterned with servo information using only an electronic connection from the servo writing device.

[0045] A commonly used servo configuration known as "preset servo" in which servo pattern information is present on all disk surfaces is typically used in disk drives. The double revolution clock propagation process described here and in Patent Application Serial No. 08 / 028,044 is used to turn on the servo pattern generator 6 to write servo patterns on all surfaces. It is important to achieve such a capability at the lowest rpm when the servo writer is external to the di...

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Abstract

A method for generating a timing pattern for self-servowriting on a rotating disk, comprising the steps of: writing a first track including N first trigger patterns spaced about said track; moving the head by a distance corresponding to a fraction of the head width to a first servo track; detecting each of said first trigger patterns and writing a corresponding second trigger pattern on a second servo track at a time interval A after detection of each of said first trigger patterns, while measuring first time intervals T(n) between every two adjacent first trigger patterns; writing a corresponding third set of trigger patterns at times B(n) after detection of said second trigger patterns based on T(n) and A; computing a time interval B(n) based on the former steps for writing subsequent servo tracks on said disk.

Description

technical field [0001] This application is related to serial number "A Method and System for Writing Servo Patterns on a Storage Medium" by T. Chainer et al., filed March 8, 1993, commonly assigned with this application and incorporated herein by reference U.S. Patent Application Ser. No. 08 / 028,044. This application is also related to US Patent Application Serial No. 349028, Attorney No. Y0994-253, filed December 2, 1994 by E. Yarmchuk et al., which is incorporated herein by reference. Background technique [0002] The present invention relates generally to storage devices for hard drive storage of computers. In particular, it relates to a magnetic disk drive and a method for writing servo track information therein. More particularly, the present invention relates to establishing servo patterns on a recording surface of a recording medium while reducing the need for complex mechanisms and / or optical positioning systems. [0003] As described in International Patent Appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/55G11B5/596G11B19/04G11B21/10
CPCG11B21/106G11B5/5565G11B5/59633G11B19/04G11B21/00
Inventor T·J·程纳A·P·普莱诺M·D·舒尔茨B·C·韦布E·J·亚卓克
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV