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:
Jan. 31, 2012
Filed:
Jul. 17, 2009
Shuji Nishida, Kanagawa, JP;
Yasutaka Nishida, Kanagawa-ken, JP;
Masafumi Mochizuki, Kanagawa-ken, JP;
Hideaki Maeda, Kanagawa, JP;
Shuji Nishida, Kanagawa, JP;
Yasutaka Nishida, Kanagawa-ken, JP;
Masafumi Mochizuki, Kanagawa-ken, JP;
Hideaki Maeda, Kanagawa, JP;
Hitachi Global Storage Technologies, Netherlands, B.V., Amsterdam, NL;
Abstract
A hard-disk drive. The hard-disk drive includes a magnetic-recording disk including tracks on which a plurality of patterned bit-cells that are isolated magnetically are aligned at predetermined alignment pitches. The hard-disk drive includes a magnetic-recording head which is configured to follow tracks, and to write and to read data. The hard-disk drive includes a signal-processing unit which is configured to generate a recording signal based on a write-clock signal with cycles corresponding to alignment pitches of patterned bit-cells, and to output a recording signal. The hard-disk drive includes a phase-detecting unit which is configured to detect a phase of the write-clock signal when the magnetic-recording head reaches an end point of a predetermined range. The hard disk drive includes a determination-processing unit which is configured to determine success of data writing based on a difference between an expected value and a detected value of the phase of the write-clock signal.