Disc file system with improved seek control
US4125882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1977 |
| Grant date | Nov 14, 1978 |
| Priority date | — |
| Expiry date | Jun 23, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5547
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The disc file system being improved includes a motor driven transducer carriage for positioning the transducer in selected cylinder positions. A command unit issues step pulses and the carriage provides detent pulses respectively representing the number of tracks (cylinders) to be and being crossed when the carriage is caused to move and moves from one cylinder position to another one. These pulses are processed so that overlap is avoided in that following the trailing edge of each step or detent pulse, a process pulse, is produced either with or without delay depending on the need to avoid conflict. The process pulses to be produced are up an down counted for tracking actual carriage movement, and the total count is zero when the carriage has arrived at the desired position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.