Method for minimizing time for adjusting servo offsets in a hard disk drive
US5166842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1990 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Feb 28, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for effecting a transition from data track following by one data head adjacent one disk of a rotating disk data storage device to data track following by a second data head adjacent a second disk wherein the data tracks are part of a cylinder of tracks including a servo track followed by a servo head with an offset appropriate to each data track. A servo control circuit between the servo head and the coil of an actuator on which the heads are mounted receives a position error signal from the servo head and an offset signal from a microcomputer during following of each track and the transition is effected by adjusting the offset signal in a succession of discrete steps from the offset appropriate for one data head to the offset appropriate to the other data. Steps of the succession can have magnitudes equal to successively selected proportions of the offset signal difference for the two data heads or can vary alternatively between the offset signal difference for the two heads and a zero magnitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.