Unlock instant, AI-driven research and patent intelligence for your innovation.

Apparatus and methods of generating a test pattern of data, analysing a test pattern of data, and testing a data storage disk medium and/or a read/write head

A test data and data test technology, applied in the modification of read/write signals, alignment of tracks on the disk, recording of information on the disk, etc., can solve serious problems in the test process, test data pattern distortion, disk Rotation speed fluctuations, etc.

Inactive Publication Date: 2010-05-19
XYRATEX TECH LTD +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the motor speed can only be controlled within a certain tolerance, which leads to undesired fluctuations in the disk rotational speed
Such fluctuations distort the test data pattern both when it is written to disk and when it is read back from disk
For tests that require high precision, this distortion can cause serious problems in the test process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Apparatus and methods of generating a test pattern of data, analysing a test pattern of data, and testing a data storage disk medium and/or a read/write head
  • Apparatus and methods of generating a test pattern of data, analysing a test pattern of data, and testing a data storage disk medium and/or a read/write head
  • Apparatus and methods of generating a test pattern of data, analysing a test pattern of data, and testing a data storage disk medium and/or a read/write head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] see figure 1 , the spin stand 1 includes an air spindle 2 driven by a motor 3 on which a magnetic disk 4 is mounted. The spin stand 1 also includes a loading mechanism (not shown), which is used to hold the head gimbal assembly 5 and position the read / write head 6 of the head gimbal assembly 5 on the surface of the magnetic disk 4, so that it can be positioned on the surface of the magnetic disk 4. Data is written or read from tracks on the surface of the magnetic disk 4 . The above-mentioned spin stand is an existing type.

[0028] The spin stand 1 has a laser coding system 7 associated with its main shaft 2, enabling the position of the main shaft 2 to be precisely determined. The principle of the laser coding system 7 is well known in the technical field, so it will not be described in detail here. In particular, suitable laser encoding systems 7 have been developed for use in conjunction with servo track writing devices which keep the successively written servo t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

There is disclosed apparatus and methods of generating a test pattern of data, analysing a test pattern of data, and testing a data storage disk medium and / or a read / write head. In a preferred embodiment there is disclosed a method of generating a test pattern of data to be written to a data storage disk medium (4) for testing. The method comprises: rotating the disk (4); detecting fluctuations in the speed of rotation of the disk (4); producing a reference clock signal (53) in accordance with said fluctuations so as to be synchronised with the rotation of the disk (4); and, generating a test pattern of data (58) using said reference clock signal (53) as a timing reference.

Description

technical field [0001] The present invention relates to apparatus and methods for generating, analyzing data test patterns, and testing data storage disk media and / or read / write heads. Background technique [0002] In embodiments, the present invention generally relates to head media testing devices, such as "spinstands" or "dynamic electronics testing machines" as are well known in the art. In the field, "spinstands" were first developed in research and development as application tools that allow the performance of various components of disk drives (eg, heads, disks, and tracks) to be evaluated and optimized. Today, it is common in the field of disk drive manufacturing to use spinstands to test each read / write head or disk produced before it is assembled in a disk drive unit. [0003] A typical spin stand includes a motor-driven spindle on which the disk under test can be mounted and rotated, and a head holding and positioning loading mechanism for the read / write head unde...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/596G11B19/28
CPCG11B20/1403G11B2220/2537G11B5/59633G11B20/10425G11B20/10222G11B19/28G11B20/10481G11B2020/10638G11B20/10009G11B5/596G11B5/84G11B20/18
Inventor 基思·劳兰德·查尔斯·布拉迪格雷戈里·马丁·奎克保罗·哈维·罗纳德·乔里
Owner XYRATEX TECH LTD