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:
Jul. 07, 1998
Filed:
Mar. 10, 1995
Kai CK. Sun, Saratoga, CA (US);
James A Herbst, Longmont, CO (US);
Chih-Hsiung Chang, San Jose, CA (US);
Mansur B Kiadeh, Cupertino, CA (US);
Syquest Technology, Inc., Fremont, CA (US);
Abstract
A disk drive system having downward compatibility includes a read/write head and a feedback servo controller for reading and writing information to and from a removable disk cartridge. When writing information to the data tracks of magnetic medium of a lower-capacity disk cartridge, in which the data tracks are substantially wider than the width of the read/write head, the read/write head is operated in an erase mode for several resolutions prior to writing the data. The read/write head is first shifted off track center by a small DC offset, then operated in an erase mode while being guided in a repeating oscillating pattern under closed loop servo control. The read/write head is then shifted off track center in the other direction, then again operated in an erase mode while being guided in a repeating oscillating pattern under closed loop servo control. A higher capacity disk drive system can thereby read and write data to the removable disk cartridge such that data which it stores on a lower-capacity removable disk cartridge may be read by lower-capacity disk drive systems without sideband interference.