The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2002
Filed:
Apr. 16, 1999
Ricky Wei Watt Yeo, Singapore, SG;
Kian Keong Ooi, Singapore, SG;
Wing Kong Chiang, Singapore, SG;
Siok Yin Tan, Singapore, SG;
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
A method and disc drive system identify defective servo information elements on a disc. Servo information elements are read from the track on the disc to receive first servo data status values associated with the servo information elements. If the first servo data status value associated with a first servo information element fails to satisfy a first predetermined criterion, the first servo information element is identified as a suspected servo information element. Location and error type information associated with the suspected servo information element is recorded in a hit table. The servo information elements from the track on the disc are reread with a second servo information element masked, and second servo data status values for the servo information elements are received. If the second servo data status value associated with the suspected servo information element satisfies the first predetermined criterion, the second servo information element is identified as the defective servo information element. A read head reads servo information elements from the track on the disc. A test module identifies suspected servo information elements. A hit table stores location and error type information associated with the suspected servo information elements.