Accessing a disk drive at multiple speeds

Details Accessing a disk drive at multiple speeds Accessing a disk drive at multiple speeds

2006-09-28

2009-08-04

Elmore, Stephen C (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S154000, C711S167000, C360S073030

Reexamination Certificate

active

07571279

ABSTRACT:
A disk drive apparatus has a magnetic platter, a disk drive motor, and a disk drive controller. The disk drive controller is capable of storing data onto and retrieving data from the magnetic platter while the magnetic platter turns at a predefined maximum speed. The disk drive controller is configured to receive a command to access a storage location on the magnetic platter from an external storage controller, and direct the disk drive motor to increase rotational speed of the magnetic platter to the predefined maximum speed in response to the command. The disk drive controller is further configured to, prior to the magnetic platter reaching the predefined maximum speed, access the storage location on the magnetic platter in response to the command. Accordingly, early access to storage locations on the magnetic platter is not substantially hindered by the spin up process.

REFERENCES:
patent: 6515817 (2003-02-01), Hamaguchi et al.
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Okada et al., A Novel Drive Architecture of HDD: “multimode hard discdrive,” pp. 92-93, IEEE, Jun. 2000.
Gurumurthi et al., “DRPM: Dynamic Speed Control for Power Management in Server Class Disks,” pp. 169-179, IEEE, Jun. 2003.

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