AC unlatch using grey code detection with zone partitioning
AssigneeSeagate Technology LLC
InventorsJack Ming Teng, Kok Hiang Cheong, MingZhong Ding, KianKeong Ooi
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Abstract
An information handling system, such as a disc drive, includes a base, a disc stack rotatably attached to the base, and an actuator assembly movably attached to the base. A region of the disc stack is identified as a parking band, and when power is not provided to the disc drive, the actuator assembly is held in a parked position within the parking band by a magnetic latch. The magnetic latch is overcome during a powerup process by a voice coil motor coupled to the actuator. Other regions of the disc stack are associated with various functions performed by the voice coil motor as the actuator passes over such regions.
Claims20
In a data storage device comprising a storage medium having first and second zones, an actuator for accessing the data storage medium and a motor for position the actuator, a method of unlatching the actuator from a stationary position in the first zone, comprising steps of:
- a) applying a first current to the motor until the actuator has left the first zone and entered the second zone, the first current having a first profile associated with the first zone;
- and
- b) applying a second current to the motor until the actuator has left the second zone, the second current causing the actuator to travel in a single direction.
A data storage device comprising:
- a) a storage medium comprising first, second and third zones, the third zone comprising data configured to be read and returned to a host device;
- b) an actuator for accessing the storage medium, the actuator having a latched position in the first zone
- c) a motor for positioning the actuator;
- and
- d) a current driver which applies a first current to the motor when the actuator is in the first zone, the first current having a profile associated with the first zone, the current driver further applying a second current to the actuator when the actuator is in the second zone, the second current adapted to cause the actuator to travel through the second into the third zone.
Dependencies are inferred from the claim text.