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:
Oct. 03, 2006
Filed:
Aug. 13, 2003
Kei Yasuna, Chiyoda, JP;
Yohichi Kusagaya, Mishima, JP;
Takashi Yamaguchi, Tsuchiura, JP;
Makoto Horisaki, Odawara, JP;
Kenichiro Sugiyama, Abiko, JP;
Kei Yasuna, Chiyoda, JP;
Yohichi Kusagaya, Mishima, JP;
Takashi Yamaguchi, Tsuchiura, JP;
Makoto Horisaki, Odawara, JP;
Kenichiro Sugiyama, Abiko, JP;
Hitachi Global Storage Technologies Japan, Ltd., Odawara, JP;
Abstract
A magnetic disk apparatus capable of generating a reference clock signal without using an external reference by writing a clock track only once using a head of the magnetic disk apparatus even if the head is of a read/write element separation type. Using the head of the magnetic disk apparatus, a clock track is recorded only once and the recorded clock track is played back to measure the total number of clock bits in one revolution. A time interval between servo sectors is determined by dividing the total number of clock bits thus measured by the number of servo sectors. By using as a timing reference the clock bits produced by playing back the clock track, the servo sectors are recorded in such a manner that they are located at the determined interval.