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. 09, 2000
Filed:
Feb. 07, 1994
Philip R Woods, Oklahoma City, OK (US);
Seagate Technology, Inc., Shakopee, MN (US);
Abstract
A method of measuring the read-to-write offset of a track in a disc drive system having separate read and write elements measures the amplitude of a test signal across the width if a track. A test pattern is written to the track at a predetermined actuator offset, which will typically be zero. Next, the read element is incrementally moved across the width of the track to measure a maximum amplitude in the read signal from the read element. After the maximum amplitude has been determined, the read element is incrementally moved across the width of the track to find first and second actuator offset positions where the read signal has an amplitude approximately equal to a predetermined percentage of the maximum amplitude. A midpoint is calculated between the first and second actuator offset positions, and the read-to-write offset is equal to the difference between the midpoint and the predetermined actuator offset.