Disk drive spinning down disk to a spin rate based on spin-up parameter
AssigneeWestern Digital Technologies, Inc.
InventorsCarl E. Bonke, Daniel D. Reno, Nathan J. Santee
Life of this patent
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Abstract
A disk drive comprising a head actuated over a disk, and control circuitry operable to spin the disk at a first spin rate. The control circuitry is further operable to reduce the spin rate of the disk from the first spin rate to a second spin rate, wherein the second spin rate is based on a spin-up parameter associated with spinning up the disk from the second spin rate to the first spin rate. For example, the spin-up parameter may comprise one or more of a spin-up time limit, power setting, and ambient temperature.
Claims24
A disk drive comprising:
- a disk;
- a head actuated over the disk;
- and
- control circuitry operable to:
- spin the disk at a first spin rate;
- and
- reduce the spin rate of the disk from the first spin rate to a second spin rate selected from a plurality of second spin rates, wherein the second spin rate is selected based on a spin-up parameter associated with spinning up the disk from the second spin rate to the first spin rate,
- wherein the spin-up parameter comprises a peak current available.
A method of operating a disk drive comprising a head actuated over a disk, the method comprising:
- spinning the disk at a first spin rate;
- and
- reducing the spin rate of the disk from the first spin rate to a second spin rate selected from a plurality of second spin rates, wherein the second spin rate is selected based on a spin-up parameter associated with spinning up the disk from the second spin rate to the first spin rate,
- wherein the spin-up parameter comprises a peak current available.
A disk drive comprising:
- a disk;
- a head actuated over the disk;
- and
- control circuitry operable to:
- spin the disk at a first spin rate;
- reduce the spin rate of the disk from the first spin rate to a second spin rate based on a spin-up parameter associated with spinning up the disk from the second spin rate to the first spin rate;
- measure an actual spin-up time to spin up the disk from the second spin rate to the first spin rate;
- and
- adjust the second spin rate in response to the actual spin-up time.
A method of operating a disk drive comprising a head actuated over a disk, the method comprising:
- spinning the disk at a first spin rate;
- reducing the spin rate of the disk from the first spin rate to a second spin rate, wherein the second spin rate is based on a spin-up parameter associated with spinning up the disk from the second spin rate to the first spin rate;
- measuring an actual spin-up time to spin up the disk from the second spin rate to the first spin rate;
- and
- adjusting the second spin rate in response to the actual spin-up time.
A disk drive comprising:
- a disk;
- a head actuated over the disk;
- and
- control circuitry operable to:
- spin the disk at a first spin rate;
- and
- reduce the spin rate of the disk from the first spin rate to a second spin rate selected from a plurality of second spin rates, wherein the second spin rate is selected based on a spin-up parameter associated with spinning up the disk from the second spin rate to the first spin rate,
- wherein the spin-up parameter comprises an ambient temperature and a lower ambient temperature corresponds to a higher second spin rate.
A method of operating a disk drive comprising a head actuated over a disk, the method comprising:
- spinning the disk at a first spin rate;
- and
- reducing the spin rate of the disk from the first spin rate to a second spin rate selected from a plurality of second spin rates, wherein the second spin rate is selected based on a spin-up parameter associated with spinning up the disk from the second spin rate to the first spin rate,
- wherein the spin-up parameter comprises an ambient temperature and a lower ambient temperature corresponds to a higher second spin rate.
Dependencies are inferred from the claim text.