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:
Apr. 25, 1989
Filed:
Nov. 10, 1987
Makoto Shoji, Akigawa, JP;
Katsuya Enami, Houya, JP;
Teac Corporation, Tokyo, JP;
Abstract
A control system for a disk drive operating under the control of a host system for data transfer with a magnetic disk medium. The host system provides a signal indicative of whether the disk drive is in operation in a read-only mode or in a write-only or read-and-write mode. During operation in the write-only and read-and-write modes, the control system inhibits the delivery to the host system of both read data and index pulses during, for example, a disk start-up time, and access time and a transducer loading time, because the data recovered from the disk medium during such times may be inaccurate, inviting inaccurate writing. However, during operation in the read-only mode, the control system constantly permits the delivery of read data and index pulses to the host system with a view to the curtailment of the average read access time.