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:
Jun. 06, 1995
Filed:
Nov. 13, 1992
Stephen J Harris, Sunnyvale, CA (US);
Teac Corporation, Musashino, JP;
DZU Corporation, Sunnyvale, CA (US);
Abstract
A Split (Data) Field Zone Density Recording (ZDR) on a disk drive system is implemented using a disk controller with a servo timer. The servo timer estimates the periodic occurrences of the servo sectors, thereby eliminating the need for look-up tables and complex operating sequences. Whenever a servo sector is detected, a reset signal is sent to the servo timer which then estimates when the next servo sector can be expected. When the next servo sector is expected, the servo timer signals the disk controller. If this return signal from the servo timer occurs during a read/write of a split data sector, the read/write operation is suspended. The disk controller then waits for the next servo sector. After detecting the next servo sector, another reset signal is sent to the servo timer. The disk controller then synchronizes with the data bit stream and subsequently reads the remaining portion of the split data sector.