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The new procedure to search contiguous defects

IP.com Disclosure Number: IPCOM000015334D
Original Publication Date: 2001-Oct-11
Included in the Prior Art Database: 2003-Jun-20
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Abstract

Disclosed is a procedure to improve the hard disk drive quality. It is very fair to conclude that those drives with scratch shaped (radial or circumferencial) medium defects could produce more errors after shipment. So we invented the new procedure to detect such kind of media defect during manufacturing test. If we can detect the media defect during manufacturing, it is supposed to be reduce the risk of making un-recoverable errors at customer site. The procedure is as follows:

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The new procedure to search contiguous defects

Disclosed is a procedure to improve the hard disk drive quality.

It is very fair to conclude that those drives with scratch shaped (radial or circumferencial) medium defects could produce more errors after shipment.

So we invented the new procedure to detect such kind of media defect during manufacturing test. If we can detect the media defect during manufacturing, it is supposed to be reduce the risk of making un-recoverable errors at customer site.

The procedure is as follows:
(1) Make a distribution map of the read and write error. The sectors are categorized by one servo sector and 10 cylinders are defined as one cylinder block.

 srv000 srv001 srv002 srv003 srv004 srv005 srv006
+------+------+------+------+------+------+------+

cyl 000-009 |||||||| ....

+------+------+------+------+------+------+------+

cyl 010-019 |||||| xxxx | | ....

+------+------+------+------+------+------+------+

cyl 020-029 | | xxxx |xxxx | xxxx | xxxx | | | ....

+------+------+------+------+------+------+------+

cyl 030-039 | | |xxxx ||||| ....

+------+------+------+------+------+------+------+

cyl 040-049 ||| |xxxx |||| ....

+------+------+------+------+------+------+------+

cyl 050-059 ||| |xxxx | | xxxx | | ....

+------+------+------+------+------+------+------+

cyl 060-069 ||| |xxxx | | xxxx | | ....

+------+------+------+------+------+------+------+

cyl 070-079 | | (1)-> |xxxx || xxx x| | | ....

+------+------+------+------+------+------+------+

cyl 080-089 | | xxxx | | |xxx x| | | ....

+------+------+------+------+------+------+------+

cyl 090-099 ||||| |xxx x| | ....

+------+------+------+------+------+------+------+

cyl 100-109 ||||| |xxx x| | ....

+------+------+------+------+------+------+------+

cyl 1...