Embedded servo banded format for magnetic disks for use with a data processing system
US5278703A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1991 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Jun 21, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1282
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data processing system records information on magnetic disks in a format in which sector headers, which include embedded servo information, are radially aligned and recorded at a single frequency and data are recorded at various band-related frequencies. The system records sector headers at a frequency which is optimal for the recording of address information in the shortest sector and records the data at frequencies which are optimal for the recording of information in the disk space allocated to the data portion of the various lengths of sectors. The system synchronizes to the headers, using conventional embedded servo synchronization methods, and produces header timing signals. It can then use the same header timing signals to locate and interpret the headers on different tracks, since the header frequency and the location of the headers are the same in every track. The system may record the data portions of the sectors at frequencies which are related to the header frequency by ratios of small integers. The system then uses, in synchronizing to the disk, a phase locked loop which includes a voltage controlled oscillator (VCO) that is driven to a reference frequency which is d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.