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:
Feb. 03, 2009
Filed:
Jun. 29, 2005
Yoshikatsu Fujii, Kanagawa, JP;
Soichi Isono, Kanagawa, JP;
Tomoki Ooura, Kanagawa, JP;
Minoru Tsukada, Kanagawa, JP;
Yoshikatsu Fujii, Kanagawa, JP;
Soichi Isono, Kanagawa, JP;
Tomoki Ooura, Kanagawa, JP;
Minoru Tsukada, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., AZ Amsterdam, NL;
Abstract
Embodiments of the invention eliminate the unnecessary disk format margin to raise the format efficiency. In one embodiment, a disk control unit (MPU) predicts the variation of the next servo sector pulse interval based on each learnt servo sector pulse interval. From this predicted interval, an optimal variation of the data sector pulse interval is determined for the current servo sector pulse. This optimal variation is set to an internal register of the hard disk controller (HDC). Based on this set variation, an internal calculation circuit calculates a corrected data sector pulse interval. Thus, data sector pulses are output at intervals optimized on an individual servo sector basis.