Disk drive booting from volatile semiconductor memory when exiting power save mode
AssigneeWestern Digital Technologies, Inc.
InventorWayne A. Thorsted
Life of this patent
Estimating the term…
Abstract
A disk drive is disclosed comprising a head actuated over a disk, a first volatile semiconductor memory (VSM), and a second VSM. When the disk drive is powered on, control circuitry first reads VSM initialization code from the disk, first initializes the first VSM using the VSM initialization code, stores the VSM initialization code in the second VSM, and then enters a power save mode. When exiting the power save mode, the control circuitry second initializes the first VSM using the VSM initialization code stored in the second VSM.
Claims22
A disk drive comprising:
- a disk;
- a head actuated over the disk;
- a first volatile semiconductor memory (VSM);
- a second VSM;
- and
- control circuitry operable to:
- when the disk drive is powered on, first read VSM initialization code from the disk;
- first initialize the first VSM using the VSM initialization code;
- store the VSM initialization code in the second VSM;
- enter a power save mode;
- and
- when exiting the power save mode, second initialize the first VSM using the VSM initialization code stored in the second VSM.
A method of operating a disk drive, the disk drive comprising a head actuated over a disk, a first volatile semiconductor memory (VSM), and a second VSM, the method comprising:
- when the disk drive is powered on, first reading VSM initialization code from the disk;
- first initializing the first VSM using the VSM initialization code;
- storing the VSM initialization code in the second VSM;
- entering a power save mode;
- and
- when exiting the power save mode, second initializing the first VSM using the VSM initialization code stored in the second VSM.
Dependencies are inferred from the claim text.