Hard disk drive adaptation based on approach time measurement

Details Hard disk drive adaptation based on approach time measurement Hard disk drive adaptation based on approach time measurement

1990-04-30

1992-09-22

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7807, 360 60, G11B 555, G11B 1904

Patent

active

051502666

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.

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patent: 4949201 (1990-08-01), Abed

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