Method and apparatus for positioning head of disk drive using zone-bit-recording
US5257143A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 15, 1991 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Jan 15, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1258
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A zone-bit-recording disk drive has a rotating platter with a surface which is divided into at least two zones each having a respective different number of angularly spaced sectors therein. A method and apparatus for positioning the head relative to the platter surface involve maintaining a count of the number of sectors which pass the head after the platter passes a predetermined angular orientation, ignoring the count during a time interval when the head moves out of a first of the zones toward a second of the zones which contains the specified sector and until the head has entered the second zone and the platter thereafter passes a predetermined angular orientation, and thereafter determining when the count corresponds to the specified sector to be accessed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.