Hard disk drive adaptation based on approach time measurement
US5150266A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1990 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Apr 30, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5547
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for maximizing throughput of a hard disk drive by adaptively seeking to a data track at which data is to be stored and adaptively commencing the reading or writing of data in accordance with the movement of the read/write head in the proximity of the data track. In each seek to a data track, an approach time for movement of the read/write head from the entry into a fine control region about the track to a selected distance from the track is measured and reading or writing is commenced at the end of a delay time selected in relation to the approach time. The tracks on the disk are assigned to a plurality of concentric zones to which profile adjustment bins are assigned to contain an adaptive profile adjustment that is added to terminal portions of a read/write head velocity demand profile in accordance with which seeks to tracks are effected. The contents of the profile adjustment bin assigned to the zone containing a track to which a seek is made is updated at the end seek in relation to the direction of the seek and the approach time measured for the seek.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.