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. 26, 2002
Filed:
Nov. 13, 1998
Glenn B. Dixon, West Point, UT (US);
Iomega Corporation, Roy, UT (US);
Abstract
A system and method for AC erasing fields on tracks in a disk is provided. An AC three-pass write technique is used in a disk drive to erase old data from an older generation, wide track disk with a newer generation, narrower read/write head, and write new data to the wide track disk with the narrower head. A strong AC bias field (instead of a DC bias field) is applied to the read/write head during the erase passes in the multipass technique, thereby reducing the net signal-to-noise ratio when the written data is read back in an older drive with a wider head. Moreover, a request from a disk drive controller for a DC erase is detected and the DC erase signal is automatically replaced with an AC erase signal.