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:
Oct. 18, 1994
Filed:
Jan. 10, 1992
Takehiko Yasuda, Shiwa, JP;
Yoshiya Kikuchi, Esashi, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A flexible magnetic disc drive apparatus is provided in which access efficiency to a flexible magnetic disc is improved, and which enables rewriting alternate information in the case of alternate registration and allows access even if there is a defect in an ID field. The flexible magnetic disc drive apparatus defines an alternate area for a defective sector assigned with a logical sector number separately from usual sectors provided outside a user area on a medium where normal access is performed, a system area for registering the alternate information and for other purposes, an area for writing the number of rewrite times of the plurality of system areas, and a storage section for storing alternate information read out of the system area, wherein it is made possible to apply a predetermined operation to the storage section where alternate information has been registered so as to be retrieved at a high speed when accessing the medium, and to recognize a correct alternate information among a plurality of informations even where a defect is generated in the system area on the medium.