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:
Mar. 24, 2009
Filed:
Sep. 07, 2007
Honyeong Mak, Singapore, SG;
Linnah Lim, Singapore, SG;
Dethau Wu, Singapore, SG;
Edmun Chiansong Seng, Singapore, SG;
Uttheng Kan, Singapore, SG;
HonYeong Mak, Singapore, SG;
LinNah Lim, Singapore, SG;
DetHau Wu, Singapore, SG;
Edmun ChianSong Seng, Singapore, SG;
UttHeng Kan, Singapore, SG;
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
Apparatus and methods are disclosed that regulate head fly height so as to compensate for variation in height of a disk surface. An exemplary apparatus includes a circuit that detects disk height variation in response to variation in the gain of a variable gain amplifier, within an automatic gain control loop, that amplifies a read signal as the head reads from the disk surface. The circuit regulates the head fly height so as to compensate for the detected variation in disk height.