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. 17, 1987
Filed:
Jun. 14, 1984
Haruhiko Banno, Tokyo, JP;
Koichi Dewa, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
When a FORMAT COMMAND is executed, a track density data indicating a track density of 96 TPI or 48 TPI is written into a discrimination area of a disk. When the disk is set into the FDD and is used, a CPU reads out track density data from the disk and produces a flag byte data, including the track density data, and stores it into a main memory. When SEEK COMMAND is executed, a track density of the disk is checked to see if it is 96 TPI or 48 TPI on the basis of the flag byte data. If it is determined that the disk of 48 TPI is set into the FDD for use in driving a disk of 96 TPI according to this discrimination, an FDC outputs a STEP signal for allowing the traveling distance of the head to be doubled as compared to an ordinary distance, thereby controlling the seeking operation by the FDD so as to assuredly move the head to a predetermined desired track.