Method for reducing rotational latency in a disc drive

Details Method for reducing rotational latency in a disc drive Method for reducing rotational latency in a disc drive

1995-05-25

1996-10-29

Hindi, Nabil Z.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 47, 369 54, 369 32, 369 4428, 369 7804, G11B 700

Patent

active

055703321

ABSTRACT:
The present invention is a method for decreasing rotational latency in systems which include a data retrieval element and a rotating medium. The method requires that the rotating medium be divided into a plurality of discrete angular regions. For each discrete angular region, a number of cylinders that may be traversed by the data retrieval element during a single revolution of the medium is identified. A rotational latency assigned to each discrete angular region based on a current location of the retrieval element. A command queue array is searched for a command that addresses a location within a range of cylinders determined by the number of cylinders in the discrete angular region having the smallest rotational latency. Finally, the command addressing a location in the range of cylinders in the selected discrete angular region of the medium is executed.

REFERENCES:
patent: 4656538 (1987-04-01), Mattson
patent: 4899234 (1990-02-01), Genheimer
patent: 5140683 (1992-08-01), Gallo et al.
patent: 5150266 (1992-09-01), Albert
patent: 5151639 (1992-09-01), Hasegawa et al.
patent: 5247498 (1993-09-01), Takekoshi et al.
patent: 5268804 (1993-12-01), Wallis
patent: 5422762 (1995-06-01), Jerbic
patent: 5459853 (1995-10-01), Best et al.
Japanese Patent Abstract No. JP 2276083, Nov. 9, 1990, p. 1.
Japanese Patent Abstract No. JP 63247987, Oct. 14, 1988, p. 1.
Japanese Patent Abstract No. JP 1121920, May 15, 1989, p. 1.
Japanese Patent Abstract No. JP 4191921, Jul. 10, 1992, p. 1.
Japanese Patent Abstract No. JP 2165220, Jun. 26, 1990, p. 1.
Seltzer, et al., "Disk Scheduling Revisited", Usenix Winter 1990 Technical Proceedings, pp. 313-324, Jan. 22, 1990.
Jacobson, et al., "Disk Scheduling Algorithms Based on Rotational Position", Hewlett-Packard Laboratories Technical Report, HPL-CSP-91-7, Feb. 26, 1991, pp. 1-18.

Affiliated with

Also associated with

Rating

Method for reducing rotational latency in a disc drive does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for reducing rotational latency in a disc drive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for reducing rotational latency in a disc drive will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1790603