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:
Dec. 03, 1991
Filed:
May. 06, 1991
Kazuhiko Sumiya, Kanagawa, JP;
Hajime Sugino, Kanagawa, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A magnetic disk system comprises: a magnetic disk in which servo information is stored deeply in the appropriate fields Es longitudinally separated from the data field ED into which information of each track is stored; a subhead provided at a position ahead of the main head in a direction of data writing through the main head, the subhead being in a unitary construction with the main head and having a wider gap than the main head; a tracking control means for controlling the position of the main head relative to the desired track on the basis of the servo information SD that is read by means of the subhead for erasing information at the data field ED by means of the subhead prior to data writing by the main head in the data field ED; and a switch means for shifting the switch to tracking control means or to information erasing means.