Servo positioning control system for a data storage apparatus
US4377827A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1980 |
| Grant date | Mar 22, 1983 |
| Priority date | — |
| Expiry date | Nov 10, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A servo system in a disc drive for accessing and maintaining selected data tracks on a stack of discs has a first continuous position signal derived from a pre-recorded surface and a second position signal derived from servo information in sectors of the other discs. The first and second position signals are combined to form a hybrid signal to control the actuators. The hybrid signal is the second signal when the second signal is generated. When the second signal is not generated, the hybrid signal is a modified first signal plus the last known second signal. The modified first signal is the difference between the first signal presently generated and the first signal generated when the second signal was last generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.