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Reduction of the average access time with thin-film head arrays

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1 Author(s)
Tsui, R. ; Memorex Corporation, Santa Clara, California

The average access time, ta, of a moving head disc file can be drastically reduced by the application of multi-track Thin-Film Head Arrays. It is shown analytically that ta= ts+ 16/15(Sm/a)1/2, where tsis the settling time, Sm, the maximum seek length and a, the constant acceleration and deceleration. When eight arrays each containing 25 thin-film heads are used to cover a 50 mm span of disc recording surface with a track density of about 40 track/mm, the average access time on the order of 2 to 6 m sec. can be achieved depending on the settling time, with present batch fabricated vertical inductive head design and constant acceleration and deceleration of 10,000 to 20,000 cm/sec2.

Published in:

Magnetics, IEEE Transactions on  (Volume:14 ,  Issue: 5 )