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. 04, 2000
Filed:
May. 29, 1997
Hiro Karube, Toyko, JP;
NEC Corporation, , JP;
Abstract
In a magnetic disk apparatus performing a positioning operation in a sector servo system, an AGC amplification gain measuring circuit measures an amplification gain of an AGC amplifier on the basis of the reproduction of a magnetic pattern in an AGC region within a servo area of a magnetic disk. An AGC amplification gain judgment circuit judges whether the value of the amplification gain measured by the AGC amplification gain measuring circuit is out of a set range, and outputs the judgment result. When receiving from the AGC amplification gain judgment circuit a judgment result indicating that the value of the amplification gain is out of the set range, a recording/reproducing operation control circuit stops the recording operation of a recording circuit.