Bobby Conley

US Patent:

6078458, Jun 20, 2000

Filed:

Sep 9, 1997

Appl. No.:

8/926377

Inventors:

Louis J. Fioravanti - Edmond OK
Bobby E. Conley - Yukon OK
Russel R. Clemmons - Choctaw OK
T. L. Parasuram - Oklahoma City OK

Assignee:

Seagate Technology, Inc. - Scotts Valley CA

International Classification:

G11B 1546

US Classification:

360 7303

Abstract:

Apparatus and method for writing servo information in a head disc assembly (HDA) comprising a head, a disc and a spindle motor for rotating the disc. The servo information is written by the head to servo fields on the disc. A positioning system positions the head relative to the disc and a control circuit controls the positioning of the positioning system as well as the rotational speed of the spindle motor. An electro-mechanical transducer outputs a signal indicative of vibratory response of the HDA as the disc is rotated and a computer is provided which instructs the control circuit to rotate the spindle motor at each of a plurality of rotational speeds while characterizing the vibratory response of the HDA using the signal from the transducer for each of the rotational speeds. An optimal rotational speed is thereafter selected and used to write the servo information, the optimal rotational speed minimizing variation in the placement of the servo information.

US Patent:

43464122, Aug 24, 1982

Filed:

Apr 21, 1981

Appl. No.:

6/256158

Inventors:

Bobby E. Conley - Yukon OK

Assignee:

Magnetic Peripherals, Inc. - Minneapolis MN

International Classification:

G11B 509
G11B 502

US Classification:

360 46

Abstract:

A read signal processing circuit for a magnetic storage disk. The processing circuit used to accomodate intersymbol inference and base line noise problems of a magnetic recording code having minimum to maximum flux reversal time span ratio of 3-10. The circuit receives an amplified analog read signal and outputs a binary reconstruction of the original encoded write signal.