# US 7,609,472 B2 · Power and thermal management for a hard drive

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- Number: US 7,609,472 B2
- Document ID: US7609472B2
- Status: Granted
- Kind: B2
- Application number: 10/858,193
- Filed: 2004-06-01
- Published: 2005-12-01
- Granted: 2009-10-27
- Earliest claimed: 2004-06-01
- Assignees: Hewlett-Packard Development Company, L.P.
- Inventors: Lee W. Atkinson
- Web page: https://patentgrep.com/patent/US7609472B2

## CPC

- G11B 5/5565: {system adaptation for compensation of variations of physical parameters, e.g. temperature}
- G11B 19/046: {Detection or prevention or problems due to temperature}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

According to certain embodiments of the present invention, a data storage device is provided. The exemplary data storage device includes actuation mechanism control circuitry configured to selectively operate an actuation mechanism at first and second performance levels, wherein the first performance level accesses data from a data storage medium at a faster rate than the second performance level.

## Claims

### Claim 1

A data storage device, comprising:
actuation mechanism control circuitry configured to selectively operate an actuation mechanism for actuating a data head at first and second performance levels, wherein the first performance level accesses data from a data storage medium at a faster rate than the second performance level;
wherein the first and second performance levels are selected by an operating system based on a utilization rate of the data storage device; and
wherein the actuation mechanism control circuitry includes an operational amplifier and a plurality of feedback paths bridged across the operational amplifier.

### Claim 2 (depends on 1)

The data storage device as recited in claim 1, wherein the actuation mechanism comprises a voice coil motor.

### Claim 3

A computer system, comprising:
a disk drive assembly, comprising:
a data head coupled to a support structure and configured to read and write data with respect to a data storage disk; and
an actuation mechanism selectably operable at first and second data accessing rates and configured to actuate the support structure to position the data head at a plurality of data locations on the data storage;
wherein the actuation mechanism is configured to transition between data accessing rates by controlling the voltage gain produced by an operational amplifier; and
wherein the first and second data accessing rates are selected by an operating system based on utilization of the disk drive.

### Claim 4 (depends on 3)

The computer system as recited in claim 3, comprising a computing device including a processor and configured to receive and transmit data to and from the data storage disk.

### Claim 5 (depends on 4)

The computer system as recited in claim 4, wherein the computing device comprises a laptop computer.

### Claim 6 (depends on 4)

The computer system as recited in claim 4, wherein the computer device comprises a desktop computer.

### Claim 7 (depends on 4)

The computer system as recited in claim 4, wherein the computer device comprises a server.

### Claim 8 (depends on 3)

The computer system as recited in claim 3, comprising sensing circuitry configured to facilitate transition of the actuation mechanism between the first and second data accessing rates in response to an override condition.

### Claim 9 (depends on 1)

The data storage device as recited in claim 1, wherein the actuation mechanism control circuitry is configured to selectively operate at a performance level based on inputs from a temperature sensor.

### Claim 10 (depends on 3)

The computer system as recited in claim 3, wherein the actuation mechanism is configured to transition between data accessing rates based on inputs from a temperature sensor.

### Claim 11 (depends on 1)

The data storage device of claim 1, at least one feedback path having an open and a closed state, the closed state corresponding to the second performance level and the open state corresponding to the first performance level.