Brian G Pollock

US Patent:

6650501, Nov 18, 2003

Filed:

Sep 28, 2001

Appl. No.:

09/967672

Inventors:

Kent Jon Forbord - St. Louis Park MN
Brian Robert Pollock - Eden Prairie MN
Joshua Ward Christensen - Burnsville MN

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 1718

US Classification:

360 9701, 360 9808, 360 9912

Abstract:

To alleviate excessive non-repeatable runout (NRRO) on heads between discs, an original multi-disc design is adapted by (a) reducing the number of discs in the stack and (b) configuring the disc drive of the adapted design with a larger nominal inter-disc separation than that of the original design. In one embodiment, the larger separation is maintained by an increased number of disc spacers between each consecutive pair of the discs in the disc stack of the modified design. The result of such a design adaptation is a disc drive with better performance characteristics than would exist by the original design.

US Patent:

6731453, May 4, 2004

Filed:

Jun 27, 2001

Appl. No.:

09/893379

Inventors:

Garry E. Korbel - New Prague MN
Brian R. Pollock - Eden Prairie MN

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5596

US Classification:

360 7804, 360 69, 360 75, 360 7806

Abstract:

A disc drive comprises a drive motor mechanically coupled to a disc and a voice coil motor mechanically coupled to a read/write head on the disc. A power integrated circuit is electrically coupled to the drive motor and the voice coil motor. The power integrated circuit includes an integrated temperature sensor that provides a temperature output. A control circuit receives the temperature output and provides a voice coil motor control output to the power integrated circuit as a function of the temperature output.

US Patent:

6751045, Jun 15, 2004

Filed:

Jan 12, 2000

Appl. No.:

09/481422

Inventors:

John Christopher Morris - Minneapolis MN
Brian Robert Pollock - Eden Prairie MN
Timothy Francis Ellis - Tonka Bay MN

Assignee:

Seagate Technology, LLC - Scotts Valley CA

International Classification:

G11B 5596

US Classification:

360 7704, 360 75, 360 7809

Abstract:

A method and apparatus for compensating for repeatable run-out errors in a disc drive is disclosed. The compensation is created by determining transfer function values for a servo loop in the drive as well as a sequence of repeatable run-out values for a portion of a disc. The repeatable run-out values are divided by respective transfer function values to produce compensation values that are inverse transformed to produce time-domain compensation values. These time-domain compensation values are injected into the servo loop to compensate for repeatable run-out errors.

US Patent:

6952320, Oct 4, 2005

Filed:

Dec 8, 2000

Appl. No.:

09/733405

Inventors:

Brian Pollock - Eden Prairie MN, US
Alexei H. Sacks - Edina MN, US
Brian Sudman - Eden Prairie MN, US
James H. McGlennen - Eden Prairie MN, US
Reed D. Hanson - Chaska MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B005/596
G11B015/12

US Classification:

360 7704, 360 63

Abstract:

The present invention relates to repeatable runout (RRO) compensation of servo control systems that can be used in disc drives or spin-stands. The RRO relates to eccentricity between servo tracks, which were written onto a disc prior to the installation of the disc into the disc drive or spin-stand, and an axis of rotation of the disc. The present invention compensates the servo control loop by canceling the RRO and controlling a head to follow virtual tracks which are eccentric to the data tracks defined by the servo tracks and concentric with the axis of rotation of the disc.

US Patent:

7330322, Feb 12, 2008

Filed:

Jan 28, 2005

Appl. No.:

11/046037

Inventors:

Reed David Hanson - Chaska MN, US
Brian Robert Pollock - Eden Prairie MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5/09

US Classification:

360 48

Abstract:

A data storage system and a method for storing data in a data storage system are provided. The data storage system includes a data storage medium that has at least one physical track that stores at least a portion of manufacturing process data, and virtual tracks that store user data.

US Patent:

7539814, May 26, 2009

Filed:

Jun 26, 2003

Appl. No.:

10/606597

Inventors:

Brian R. Pollock - Eden Prairie MN, US
Reed David Hanson - Chaska MN, US
Nathaniel Boyd Wilson - Edmond OK, US
Jason Dale Gregg - Longmont CO, US
Mark Larry Birtzer - Lake City MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G06F 12/00
G06F 13/00
G06F 13/28
G11B 21/08

US Classification:

711112, 369 301

Abstract:

A processor is configured to perform a method () including a step of deriving lateral offset indicators () from a longitudinal position measurement (). Improved seek cost indicators () are generated, some or all based on a respective lateral offset indicator (). Then a target destination is selected using at least one of the improved seek cost indicators ().

US Patent:

20110051581, Mar 3, 2011

Filed:

Aug 25, 2009

Appl. No.:

12/547380

Inventors:

Peter R. Janik - Shakopee MN, US
Scott Douglas Ulrich - Apple Valley MN, US
Paul William Burnett - Savage MN, US
Brian Pollock - Eden Prairie MN, US

Assignee:

Seagate Technology LLC - Scotts Valley MN

International Classification:

G11B 27/36
G01H 17/00
G06F 19/00
G08B 21/00

US Classification:

369 5342, 702 56, 340540, G9B 27052

Abstract:

A method includes acquiring, by a data storage device, signals generated by one or more sensors that relate to a mechanical vibration of the data storage device. The one or more sensors are in electrical communication with the data storage device. The method includes storing a representation of the signals as data in the data storage device.

US Patent:

60697644, May 30, 2000

Filed:

Jun 29, 1998

Appl. No.:

9/106443

Inventors:

John Christopher Morris - Minneapolis MN
Brian Robert Pollock - Eden Prairie MN
Timothy Francis Ellis - Tonka Bay MN

Assignee:

Seagate Technology, Inc. - Scotts Valley CA

International Classification:

G11B 5596

US Classification:

360 7704

Abstract:

A method and apparatus for compensating for repeatable run-out errors in a disc drive is disclosed. The compensation is created by determining transfer function values for a servo loop in the drive as well as a sequence of repeatable run-out values for a portion of a disc. The repeatable run-out values are divided by respective transfer function values to produce compensation values that are inverse transformed to produce time-domain compensation values. These time-domain compensation values are injected into the servo loop to compensate for repeatable run-out errors.