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:
Apr. 10, 2007
Filed:
Aug. 01, 2003
Sumio Kuroda, Kawasaki, JP;
Kazuyuki Ozaki, Kawasaki, JP;
Sumio Kuroda, Kawasaki, JP;
Kazuyuki Ozaki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The magnetic recording and reproducing apparatus reads a transfer clock synchronized with servo information and records a write-once clock pattern in a state where 0 is set as a delay time of the delay deviceand 1 is set as the dividing ratio of the frequency divider. The apparatus corrects the delay time according to the output of the phase comparatorwhich changes on the basis of the phase difference and rewrites a write-once clock pattern. Rotation of the magnetic disk, detection of the phase difference and correction of the delay time are repeatedly preformed until no change occurs in the output of the phase comparator. After the output stops changing, preformat information patterns excluding the servo information pattern are recorded as fine patterns by changing the dividing ratio of the frequency dividerto multiply the frequency.