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:
Nov. 20, 2001
Filed:
Jan. 07, 1999
Timothy D. Bouwkamp, Rochester, MN (US);
Michael J. Shea, Rochester, MN (US);
Western Digital Technologies, Inc., Lake Forest, CA (US);
Abstract
A disk drive having a rotary actuator, an embedded servo system for controlling the rotary actuator, a rotating disk surface for recording and reproducing data, and a dual element head supported by the actuator comprising a read element and a write element. The disk surface has a plurality of repeating servo track patterns defining radially spaced-apart servo tracks. The disk surface further includes a user data band having a plurality of radially spaced-apart data tracks for storing user data. Each data track is written with an offset from a corresponding servo track centerline depending on a skew introduced by the dual element head. A reserved band is located outside the user data portion including a reserved data track for storing drive specific data wherein the reserved data track is centrally aligned with a corresponding servo track centerline. The reserved data track can be read reliably by the read element when the servo system is tracking on the servo track centerline. A method for making the disk drive includes writing the reserved data track in central alignment with a corresponding servo track centerline.