Servo data recovery circuit for disk drive having digital embedded sector servo
US5420730A · kind A · utility
Inventors
Key dates
| Filing date | Jan 11, 1994 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Jan 11, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1284
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are provided for recovering servo information in a disk drive for positioning a data transducer head relative to concentric data tracks wherein the head reads user data encoded in a predetermined data code and reads servo information within plural servo sectors embedded in each data track defined on a storage surface of a rotating disk. The data tracks are arranged in plural groups of concentric tracks within concentric zones wherein each zone has a user data transfer rate selected in relation to disk radius, the servo information being recorded in at least three patterns within each embedded servo sector: a servo sync pattern, a user data code violating pattern, and a servo data bit pattern. A servo data recovery circuit implements the method comprising the steps of: PA1 timing expected arrival of a servo sector with a sector timer, PA1 at the expected arrival of the servo sector detecting a said servo sync pattern with a servo sync pattern detector, PA1 detecting at least one said user data code violating pattern with a user data code violating pattern detector, PA1 detecting recurrent servo data bit patterns as binary data bits with a data reader, PA1 dete…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.