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. 07, 2006
Filed:
Feb. 25, 2004
Daniel Jonathan Auerbach, San Jose, CA (US);
Jeffrey Joesph Dobbek, Morgan Hill, CA (US);
Gregory Michael Frees, Los Altos, CA (US);
David Robison Hall, Rochester, MN (US);
Daniel Jonathan Auerbach, San Jose, CA (US);
Jeffrey Joesph Dobbek, Morgan Hill, CA (US);
Gregory Michael Frees, Los Altos, CA (US);
David Robison Hall, Rochester, MN (US);
Hitachi Global Storage Technologies Netherlands, B.V., Amsterdam, NL;
Abstract
Tilt between a head stack and its associated disk stack in a hard disk drive (HDD) is measured by determining the deviation of a target head from its expected position (based on the position of the current head) each time electrical contact is switched from the current head to a target head. A running average tilt value is stored and used to modify the logical seek distance used in a Rotational Position Optimization (RPO) algorithm to better order I/O requests in a queue. Also, the running average tilt value can be used by the servo to pre-position the target head before electrical contact is made with the target head, to improve speed of operation.