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. 12, 1995
Filed:
Oct. 19, 1993
Clifford M Gold, Fremont, CA (US);
Quantum Corporation, Milpitas, CA (US);
Abstract
A magnetic data storage disk record carries a pattern of magnetic domains defining a plurality of concentric data tracks divided into data sectors by embedded servo sectors recorded at a predetermined constant frequency and containing head positioning information for positioning a data transducer head for reading the disk track. Each data sector is recorded at a data transfer rate selected in relation to displacement of the track from a center of the disk. Each data sector defines a plurality of variable length data segments which are combined to provide a fixed length user data block. In order to avoid a write-to-read transition and Barkhausen noise, each data sector begins with an ID header immediately following a servo sector. The ID header includes a plurality of count byte fields for providing a count of bytes of each one of the user data segments within the data sector, and a flag field for indicating whether the user data block begins at the first data block segment of the particular data sector. A disk drive data sequencer using the count bytes and flag bytes is also disclosed.