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Method and device producing magnetic reference sample on magnetic disk

A style, disk technology, applied in alignment of tracks on disks, recording of information on tapes, configuration/installation of recording heads, etc., can solve problems such as accumulation of positional errors, positional errors, etc.

Inactive Publication Date: 2009-05-06
BROADCOM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the SSW process, this deviation will cause position error
Also, during SSW, this position error accumulates because each subsequent radial track is based on the position of the previously written track

Method used

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  • Method and device producing magnetic reference sample on magnetic disk
  • Method and device producing magnetic reference sample on magnetic disk
  • Method and device producing magnetic reference sample on magnetic disk

Examples

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Embodiment Construction

[0063] Preferred embodiments of the present invention are shown in the drawings, in which the same reference numerals designate the same or corresponding parts.

[0064] Embodiments of the present invention provide a system or method for positioning a read-write (RW) head to implement a self-servo writing (SSW) process in a hard disk drive, which can adequately address the the above requirements. A first embodiment of the present invention provides a method of generating a magnetic reference pattern, such as a sector and track pattern, on a magnetic medium or disk. This includes writing the first magnetic reference pattern to disk using a servo writer. The disk is then transferred from the servo writer to a standard hard drive. The hard disk drive includes a disk controller that recognizes the first magnetic reference pattern and may be based on a velocity between the read-write head and a servo position mark (SSM) in the first magnetic reference pattern and phase differenc...

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PUM

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Abstract

The present invention provides a method of generating a magnetic reference pattern on a magnetic disk or other magnetic medium, comprising first writing a first magnetic reference pattern onto the disk using a servo writer, and then transferring the disk to a hard drive. A control circuit in the hard disk drive can identify the first magnetic reference pattern and determine the position of the read / write head in the hard disk drive based on the first magnetic reference pattern. Because the read-write head is precisely positioned based on the first magnetic reference pattern, the second magnetic reference pattern can be written to the disk using the read-write head. The position of the pick-up head is determined based on the velocity and phase between the pick-up head and the servo positioning marks contained in the first magnetic reference pattern.

Description

technical field [0001] The present invention relates to a magnetic recorder, in particular to a method and device for writing a reference pattern to a magnetic medium, and more specifically to a self-servo writing process. Background technique [0002] The structure of hard drives and how they work are well known to the public. Generally speaking, a hard disk drive includes a case, a hard disk with magnetically variable properties, and a read / write device. The read / write device includes a read / write (RW) head that can write data to a magnetic disk by locally changing the magnetic properties of the hard disk and read data from the hard disk by reading the local magnetic properties of the hard disk. A hard disk may include multiple platters, each of which is planar. [0003] All information stored on a hard disk is recorded on magnetic tracks. The tracks are concentric circles arranged on the surface of the platter. figure 1 A pattern of radially spaced concentric data tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/008G11B5/58G11B5/596G11B21/10
Inventor 金韦·托马斯·劳阿拉·W·纳扎里安本杰明·格恩柏·赖理查德·孔韦·旺
Owner BROADCOM CORP
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