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:
Sep. 22, 1998
Filed:
Sep. 01, 1995
Fred A Kool, Aptos, CA (US);
John S Packer, Milpitas, CA (US);
Adaptec, Incorporated, Milpitas, CA (US);
Abstract
A headerless hard disk architecture includes tracks that are grouped into logical zones and physical zones. The physical zones contains tracks which have similar data density and rotational velocity and therefore would have the same track format on a defect-free media. The logical zones are subdivisions of the physical zones and contain tracks similarly affected by defects on a media. A single track format for all of the tracks in a logical zone accounts for defects. A first data structure stored in a data buffer indicates boundaries of data sectors as defined by the track formats for the logical zones. A second data structure in the data buffer indicates which of the data sectors contain defects not accounted for by track formats. A disk controller uses a combination of information from the first and second data structures to identify logical data sectors requested for a data transfer.