Method for seek time optimization employing voice-coil motor cur

Details Method for seek time optimization employing voice-coil motor cur Method for seek time optimization employing voice-coil motor cur

1996-06-05

1998-08-11

Hindi, Nabil

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7809, G11B 5596

Patent

active

057935580

ABSTRACT:
A method and system for a disk drive that estimates demand DAC saturation current by performing a first slew with the demand DAC in saturation, and then iteratively refining the estimate in response to a sequence of slews with the demand DAC not in saturation. Each successive slew is performed with the demand DAC preloaded with an acceleration value calculated in the previous iteration. To perform each slew, the disk drive microcontroller loads the demand DAC with an acceleration value, waits a predetermined time interval, and reads servo signals to identify the track to which the head has slewed at the end of the time interval. The microcontroller then calculates the distance traveled by the actuator during the present slew and uses the ratio of this head travel distance to the head travel distance of the first (saturated) slew to refine the saturated acceleration value estimated in the previous iteration. These estimates converge over successive iterations toward the desired demand DAC saturation current.

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