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. 18, 1994
Filed:
Apr. 29, 1991
Applicant:
Inventor:
Ryuichi Matsuzaki, Narashino, JP;
Assignee:
Seiko Seiki Kabushiki Kaisha, , JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360 31 ; 324212 ; 369 53 ;
Abstract
An apparatus for detecting defects in a processing track on a hard disc uses an average or mean average level value as a reference value, in which an arithmetic means computes the average or mean average level value based on an average level value (Track Average Amplitude or TAA) for a plurality of tracks prior to the processing track which is stored in a memory means. The apparatus enables obtaining the reference value with less dispersion, which gives even and stable detected results of any defect in each track on the hard disc, and enables improvement in the efficiency of the throughput.