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. 06, 1992
Filed:
May. 29, 1990
Yoshiji Kitamura, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A magnetic disk apparatus for reading and writing user's data from a magnetic disk having a data surface with a plurality of concentric data tracks the data surface having a void area in which user's data is inhibited. The magnetic disk apparatus includes a magnetic head for reading and writing the user's data from and to the data tracks, detecting apparatus for detecting a circumferential position of the magnetic head at a target track, a store for storing the position and length of the void area, a timing clock generator for generating a read/write synchronization signal and control circuitry for preventing transmission of the read/write synchronization signal during a time period corresponding to the length of the void area when the circumferential position of the magnetic head corresponds to the position of the void area, thereby inhibiting read-out or write-in to or from an interface circuit while transmission of read/write synchronization signal is prevented.