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:
Jul. 25, 1989
Filed:
Sep. 16, 1987
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A magnetic disk adapted for use in a magnetic disk apparatus, which has a magnetic head with a pre-erase gap and a read/write gap with a predetermined spacing therebetween, and which uses a sector servo system to position the magnetic head onto a target track of the disk, is divided into a plurality of sectors each having an address field and a data field. A spacing gap having a length corresponding to the spacing between the erase and read/write gaps is formed at the beginning of each of the address and data fields. Servo information is provided at least in the spacing gap of the address field. The magnetic disk apparatus energizes the read/write and erase gaps at different timings, so that the initiation and termination of data erasing are performed prior to the initiation and termination of data writing, respectively.