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. 10, 2004
Filed:
Sep. 13, 2000
Tomoaki Saito, Tokyo, JP;
Isamu Tomita, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A disk drive device including a plurality of disks that are arranged concentrically about a central axis, wherein each of the disks includes a plurality of concentric tracks of different diameters. Each of the disks also includes a top surface and a bottom surface. There are a plurality of cylinders defined by a combination of one of the tracks from each of the disks, wherein each cylinder consists of a plurality of tracks of a single diameter. A plurality of heads are associated with the disks, wherein each of the heads is configured and arranged to access either a top surface or a bottom surface of one of the disks. The present invention also includes an upper level device for issuing access commands directing the heads to access the disks. When an access command is issued that requires sequential data to be accessed on more than one track, an access sequence is followed in which at least two of the top surfaces on different disks of the same cylinder are accessed directly after each other, or, at least two of the bottom surfaces on different disks of the same cylinder are accessed directly after each other.