Method and apparatus for indicating start of servo information on a recording medium
US5812338A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1996 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | May 17, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk and a disk drive having a servo start mark for identifying a servo-information start position recorded on the disk is provided. The servo start mark has a plurality of bit patterns unused for other areas in servo information. A method for identifying the position of a signal transducer on a disk is also provided in which it is judged that the signal transducer is present at a predetermined position even if an error is present and the error is a one-bit error. This is accomplished by assuming that the position is correct when the following conditions are confirmed: (a) a parity error occurs in a read servo-information bit pattern and (b) read servo-information bit pattern does not coincide with servo information of an adjacent track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.