Method and apparatus for reducing sideband interference when storing or retrieving data in a disk drive system adapted for downward compatibilty
US5777813A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1995 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Mar 10, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/031
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.