System and method for correcting for head tilt in HDD

Details System and method for correcting for head tilt in HDD System and method for correcting for head tilt in HDD

2006-11-02

2008-08-12

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07411760

ABSTRACT:
Tilt between a head stack and its associated disk stack in a hard disk drive (HDD) is measured by determining the deviation of a target head from its expected position (based on the position of the current head) each time electrical contact is switched from the current head to a target head. A running average tilt value is stored and used to modify the logical seek distance used in a Rotational Position Optimization (RPO) algorithm to better order I/O requests in a queue. Also, the running average tilt value can be used by the servo to pre-position the target head before electrical contact is made with the target head, to improve speed of operation.

REFERENCES:
patent: 5943179 (1999-08-01), Fukushima
patent: 5982721 (1999-11-01), Supino et al.
patent: 6137754 (2000-10-01), Furukawa et al.

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