Method and apparatus for constant density recording
US4894734A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1987 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | May 15, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/10916
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for providing constant density recording is described. A single set of reconfigurable electronics is employed to control the write frequency for a plurality of frequency zones on a magnetic storage disk. The reconfigurable electronics include means for selectively switching a frequency response determining element within a common channel. Switching is controlled by a digital signal provided by a disk file control microprocessor, avoiding the necessity of mechanical linkages and/or changes in spindle rotation rate. The plurality of zones need not be of equal radius in width but the recording frequency within each zone is fixed throughout that zone. Zone selection is under the control of a disk file control microprocessor which produces a digital code to appropriately configure the electronics for the particular zone. Zone switching is done only when a seek across a zone boundary occurs so that no access time penalties result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.