Kabushiki Kaisha Toshiba

Maxtor Corporation

Annie Mylang Le

Charles W Miller

Perry Neos

Allen Cheng-wu Hu

Chad Schroter

Eric Wong

Jim Chiao

Yan Zang

Teddy Hadiono

Richard M Ehrlich

Fernando Anibal Zayas

Eric R Dunn

Mine Wonkyung Budiman

Yichang Chan

Daniel Tchen

A data storage device that includes a magnetic storage device selects one or more power states of the magnetic storage device based on a time interval since a most recent time data has been read from or written to the magnetic storage device. The power state of the magnetic storage device can be changed from a higher power consumption state to a lower power consumption state when the time interval exceeds a predetermined value. The power consumption state may be changed from an active servo state to an intermediate power consumption state, a park state, and/or a standby state, depending on the time elapsed since the most recent time data has been read from or written to the magnetic storage device.

Power state change in disk drive based on disk access history

A data storage device that includes a magnetic storage device and a non-magnetic nonvolatile storage device that measures a hit rate of read/write commands that result in accesses to the non-magnetic nonvolatile storage device, and adjusts a length of a time period, such as an idle time, based on the hit rate. The duration of the time period can be set each time the magnetic storage device is accessed. Upon expiration of the time period, if the magnetic storage device has not yet been accessed, the magnetic storage device is changed from a higher power consumption state to a lower power consumption state.

Timing of power state change in a disk drive based on disk access history

Data are accessed securely in a data storage device that includes a non-volatile solid-state storage device integrated with a magnetic storage device. An identical copy of drive security data, such as an encrypted version of a drive access password, is stored in both the non-volatile solid-state storage device and in the magnetic storage device. In response to receiving a command from a host device that results in access to the magnetic storage device, access is granted to the magnetic storage device if the copy of drive security data stored in the non-volatile solid-state storage device matches the copy of drive security data stored in the magnetic storage device. Furthermore, encrypted drive-unique identification data associated with the drive may be stored in both the non-volatile solid-state storage device and the magnetic storage device, and access is granted if both copies of the encrypted drive-unique identification data match.

Secure data access in hybrid disk drive

A disk drive has multiple disk surfaces and corresponding heads, each disk surface includes multiple regions, and each head is for recording on and playback of information from a corresponding disk surface. The data track density in a first region on a first disk surface is different than the data track density in a second region on a second disk surface, and the first and second regions are radially similarly situated regions. A method of sequentially accessing data in the first and second regions includes sequentially accessing data tracks in the first region and then sequentially accessing data tracks in the second region.

Method of accessing variable density data tracks in a disk drive

A disk drive has multiple disk surfaces and corresponding heads, each disk surface includes multiple regions, and each head is for recording on and playback of information from a corresponding disk surface. The data track density in a first region on a first disk surface is greater than the data track density in a first region on a second disk surface, the data track density in a second region on the first disk surface is less than the data track density in a second region on the second disk surface, the first regions are radially similarly situated regions and the second regions are radially similarly situated regions.

Disk drive with variable density data tracks

A data storage device has multiple storage media surfaces and corresponding heads, each storage media surface includes multiple regions, and each head is for recording on and playback of information from a corresponding storage media surface. A method of defining a storage format for the storage media surfaces includes reading data from each region on each storage media surface with the corresponding head, measuring a record/playback performance of each head for each region on each corresponding storage media surface based on the data read from the regions, and selecting a track density for each region on each storage media surface based on the measured record/playback performance of the corresponding head for the region.

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San Jose, CA, United States of America

Annie Mylang Le