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US 7,352,523 B2Granted
Ramp unload in disc drives
AssigneeSeagate Technology LLC
InventorsLee Ling Tan, Xiong Liu, Choon Kiat Lim, Mui Chong Chai
Life of this patent
Estimating the term…
Abstract
Embodiments of the present invention provide for apparatus and methods for performing unload operations, including enabling read/write heads to reach a desired velocity at the ramp. Embodiments of the present invention are particularly beneficial for handheld products where low power consumption and reliability are important requirements.
Claims15
An unload method comprising:
- moving read/write heads from a pre-unload position to an initial track of a disc at a known distance from a place of rest;
- providing the read/write heads with an initial velocity when the read/write heads are at the initial track;
- and
- moving the read/write heads towards the place of rest according to a predetermined velocity profile without detecting the velocity of the read/write heads when the read/write heads are being unloaded.
1 more element
A method for unloading a head, comprising:
- moving a head from a pre-unload position to an initial track of a disc at a known distance from a place of rest, the place of rest being on a ramp;
- providing the head with an initial velocity at the initial track;
- and
- a step of moving the head towards the place of rest without detecting the velocity of the head during this step.
1 more element
A device comprising:
- a recordable region;
- a reader/writer configured for reading from or writing to the recordable region;
- a ramp configured to hold the reader/writer away from the recordable region;
- a motor operably coupled to the reader/writer, the motor producing a back electromotive force when in operation;
- and
- circuitry operably connected to the motor, the circuitry being configured to provide a current to the motor sufficient to move the reader/writer from a pre-unload position to an initial track on the recordable region at a known distance from a place of rest on the ramp and then to the ramp without sensing the back electromotive force.
3 more elements
Dependencies are inferred from the claim text.