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Magnetic disk and method of writing servo data

A technology of disk and writing head, applied in the field of servo pattern, which can solve the problem of less track marks and other problems

Inactive Publication Date: 2013-03-20
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, '506's Figure 7 design provides very few track identification bits per servo pattern, resulting in many servo patterns having to be read back to obtain a complete track identification

Method used

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  • Magnetic disk and method of writing servo data
  • Magnetic disk and method of writing servo data
  • Magnetic disk and method of writing servo data

Examples

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Embodiment Construction

[0045] The drawings and the following description illustrate specific example embodiments of the invention. It will thus be appreciated that those skilled in the art will be able to devise various arrangements which, although not explicitly described or shown herein, embody the principles of the invention and are included within the scope of the invention. Additionally, any examples described herein are intended to aid in the understanding of the principles of the invention and are to be construed without limitation to those specifically enumerated examples and conditions. As a result, the invention is not to be limited to the specific embodiments or examples described below, but by the claims and their equivalents.

[0046] figure 1 A simplified top view of a typical disk drive system 100 adapted to include the disk 110 exemplarily described herein is shown. In the disk drive system 100 , a disk 110 is rotatably mounted on a motorized spindle 120 . The slider 122 on which...

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Abstract

The invention provides a magnetic disk and a method of writing servo data. Embodiments described herein provide for robust servo patterns that comply with planarization constraints and also allow use of a single master template for manufacture of both the front and back of a magnetic disk. Planarization constraints are met because only a portion of servo data is hard patterned on the magnetic disk and the hard patterned servo data areas comply with planarization constraints. The servo pattern has two symmetrical servo write assist patterns, one on each side of a central burst pattern. The servo sync, SAM, track-ID, sector-ID, and / or RRO values can be written magnetically by the write head onto these servo write assist patterns after the completion of the planarization process. The symmetric design of the servo pattern allows both a left-to-right and a right-to-left servo write and read back, thereby enabling use of a single master template in magnetic disk manufacture.

Description

technical field [0001] The present invention relates to the field of disk drive systems and, in particular, to servo patterns imprinted on patterned disks to align sliders with data on the disk. Background technique [0002] Many computing systems use disk drive systems for mass storage of information. Disk drives typically include one or more sliders including read and write heads. The actuator / cantilever holds the slider above the disk. Disks consist of data areas and servo sectors. A Voice Coil Motor (VCM) moves the actuator / cantilever to position the slider over the selected magnetically written data using feedback from the servo data. The electronics on a disk drive system include write drivers, read signal preamplifiers, read and write channels, controllers, and firmware. Controllers are usually various circuit chips connected on a printed circuit board. The controller includes one or more microprocessors, memory, servo control circuit, hard disk control circuit, ...

Claims

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Application Information

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IPC IPC(8): G11B5/596
CPCG11B5/59688G11B5/865G11B5/596G11B5/82G11B5/746
Inventor 野中启一郎安那启小林正人
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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