Method and apparatus for sensing position in a disk drive
US5602693A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1994 |
| Grant date | Feb 11, 1997 |
| Priority date | — |
| Expiry date | Dec 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59655
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for positioning a plurality of heads traversing multiple disks in a disk drive system is disclosed herein. The positioning system includes a servo pattern recorded on at least one of the hard disks, the servo pattern having a sequence of servo locations successively recorded along concentric tracks on the disks. Burst zones are also recorded on the hard disks, each burst zone having multiple transitions recorded at staggered separate radial distances from the center of the disks. The positioning system contains means for computing servo burst signal magnitudes based on head position relative to the transitions in each burst zone, and means for calculating a head offset based on differences between the servo burst signal magnitudes and radial displacement of each head in each track. The positioning system transmits a correction signal based on calculated head position, and the output signal has a linear response for any head position on the disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.