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:
Feb. 08, 1994
Filed:
Jun. 26, 1992
Yoshihiro Moribe, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a record/reproduce apparatus, medium defects in magnetic disks are avoided without considerably losing record areas. In a record or reproduce mode, the plurality of magnetic disks are accessed in parallel by a plurality of magnetic heads and a plurality of record circuits or reproduce circuits. Regarding the record areas where only one of the magnetic disks has the medium defect, a control circuit controls a head change-over circuit so that a record area in a spare magnetic disk may be accessed by a spare magnetic head instead of the defective record area. Besides, regarding the record areas where two or more of the magnetic disks have the medium defects, the control circuit operates so that spare record areas in the two or more magnetic disks may be accessed instead of the defective record areas.