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:
May. 20, 1997
Filed:
Sep. 22, 1995
Applicant:
Inventors:
Assignee:
Fujitsu Limited, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369116 ; 369 54 ;
Abstract
A recovery is promptly executed for a reading error of a track address in a modified constant angular velocity format. Upon seeking, when a defective reading operation of the track address occurs, a clock frequency of the zone corresponding to each detecting position is selected due to the detection of the head by a head position sensor or the movement of the head to a home position at which a detection signal of a home position sensor is obtained, and the reading operation is retried. Errors due to back talk noises upon reproduction are reduced. At the time of retry for the occurrence of errors due to the back talk noises, a modulation amount of a read beam from a laser diode is changed.