Runout calibration for disc drive system
US6137753A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1997 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Apr 14, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention provides methods and apparatus for compensating for disc runout. In an exemplary embodiment, a data-storage device is provided which includes a rotatable disc and a data head for accessing the disc. The device includes a runout calibration system comprising positioning mechanics coupled to the head for moving the head relative to the disc. A servo loop incorporates the positioning mechanics and generates a drive signal used to control the positioning mechanics. A memory, having an input and an output coupled to the loop, is also provided for recording a plurality of samples of the drive signal. The memory then plays back those samples into the feedback loop at first periodic angular increments forming a calibrating drive signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.