Method to adjust head switch time for improved disk drive perfor

Details Method to adjust head switch time for improved disk drive perfor Method to adjust head switch time for improved disk drive perfor

1998-06-22

2000-09-12

Loomis, Paul

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 63, G11B 1512

Patent

active

061186090

ABSTRACT:
A disk drive having an improved method of adjusting the head switch time to improve disk drive performance. In the process of writing or reading long data files, the heads on the actuator are sequentially selected in order to access all the data tracks forming a cylinder in the shortest time. Head offsets are significantly smaller for switching between heads mounted on the same actuator arm than for switching between heads mounted on different actuator arms. Therefore improved disk drive performance is obtained by using two values of head switch time instead of one. The head switch time allocated for switching from a first head on one actuator arm to a second head on a second actuator arm is made longer than the head switch time allocated for switching from a first head on one actuator arm to a second head on the same actuator arm. By allocating longer time for the head switches between different actuator arms, the error flag rate for heads not ready is reduced. The average head switch time is reduced without increasing error rates by separately optimizing the head switch times for same actuator arm head switches and different actuator arm head switches.

REFERENCES:
patent: 4270154 (1981-05-01), Crawford
patent: 4563715 (1986-01-01), Kawamura et al.
patent: 5426758 (1995-06-01), Candelaria et al.
patent: 5432659 (1995-07-01), Kosugi et al.
patent: 5475544 (1995-12-01), Takeuchi
patent: 5969895 (1999-10-01), Ueda et al.
"Method to Avoid Long Head Switch Times", IBM Technical Disclosure Bulletin vol. 38, No. 4, Apr. 1995, p. 147.

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