Apparatus for generating an index pulse in a data storage system
US5162954A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1990 |
| Grant date | Nov 10, 1992 |
| Priority date | — |
| Expiry date | Jul 31, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An index pulse generator in a magnetic storage system reads data from a surface in the magnetic storage system and produces an index pulse. An incrementing sequence of non-zero codes, with redundancy, is written in a series of consecutive servo data frames, immediately preceding, leading up to, and including a specific servo index frame. Error tolerant circuitry reads and decodes the servo frame data, maintains a count of non-zero codes encountered, and generates an index pulse provided that both the desired count of non-zero codes has been reached and that a minimum number of matches between the non-zero frame counter and the actual frame decodes has been satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.