Thorsten Schmidt

US Patent:

6515819, Feb 4, 2003

Filed:

Mar 29, 1999

Appl. No.:

09/280417

Inventors:

Thorsten Schmidt - Milpitas CA
Tim K. Emami - San Jose CA
Fred Hansen - Newark CA

Assignee:

Maxtor Corporation - Longmont CO

International Classification:

G11B 5596

US Classification:

360 7804, 360 7808, 360 7814

Abstract:

Methods and apparatus for processing a seek request on a disk drive apparatus having a disk drive head is disclosed. The seek request is processed. During the seek request, the disk drive head is traversed across an actual distance. At least one expected seek time associated with the actual distance is obtained from a set of seek time data. One or more measurements are performed on the disk drive apparatus to obtain an update value. At least one expected seek time is then updated such that at least part of the update value is included in the at least one expected seek time.

US Patent:

6995942, Feb 7, 2006

Filed:

Apr 6, 2004

Appl. No.:

10/818744

Inventors:

Thorsten Schmidt - Milpitas CA, US

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka

International Classification:

G11B 5/596
G11B 5/09

US Classification:

360 7704, 360 48, 360 7708

Abstract:

Wedge Offset Reduction Field (WORF) data can be used to reduce the effective written-in runout of a servo pattern. In order to prevent the WORF data from being applied to an improper portion of the servo pattern, the identification of a quadrant associated with that WORF data can be stored with the WORF data. For example, the servo pattern of a hard disk can contain a number of servo burst boundaries. In order to ensure that the WORF data is applied to the proper burst boundary, the identity of a quadrant associated with that boundary can be written into the servo wedge along with the WORF data. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

US Patent:

6999266, Feb 14, 2006

Filed:

Apr 6, 2004

Appl. No.:

10/818745

Inventors:

Thorsten Schmidt - Milpitas CA, US

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka

International Classification:

G11B 5/596
G11B 5/09

US Classification:

360 7704, 360 7708, 360 48

Abstract:

Wedge Offset Reduction Field (WORF) data can be used to reduce the effective written-in runout of a servo pattern. In order to prevent the WORF data from being applied to an improper portion of the servo pattern, the identification of a quadrant associated with that WORF data can be stored with the WORF data. For example, the servo pattern of a hard disk can contain a number of servo burst boundaries. In order to ensure that the WORF data is applied to the proper burst boundary, the identity of a quadrant associated with that boundary can be written into the servo wedge along with the WORF data. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

US Patent:

7002770, Feb 21, 2006

Filed:

Feb 18, 2003

Appl. No.:

10/369976

Inventors:

Thorsten Schmidt - Milpitas CA, US

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka

International Classification:

G11B 5/09
G11B 5/596
G11B 21/02

US Classification:

360 7708, 360 53, 360 75

Abstract:

In order to increase the performance and reliability of devices including rotatable storage media, individual characteristics of device elements or heads can be determined and used to set performance criteria. The off-track capability and track mis-registration of an element or head can be determined and used to set individualized end-of-seek criteria for elements or heads of devices including rotatable storage media.

US Patent:

7002884, Feb 21, 2006

Filed:

Feb 13, 2003

Appl. No.:

10/366237

Inventors:

Thorsten Schmidt - Milpitas CA, US
Brian K. Tanner - San Jose CA, US

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka

International Classification:

G11B 7/00

US Classification:

369 4738, 369 5337

Abstract:

The power consumed by a data storage device having at least one disk connected with a spindle can be reduced by reducing the rotation rate of the spindle to a rotation rate greater than zero. In one method in accordance with the present invention, wherein a head is in communication with each disk, the spindle can be rotated at a first rotation rate. The head can be parked and the rotation of the spindle can then be reduced to a rotation rate greater than zero. By reducing the rotation rate of the spindle, the power consumed by the spindle can be reduced by approximately the ratio of spin speeds to the exponential power of 1. 5. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

US Patent:

7023649, Apr 4, 2006

Filed:

Feb 18, 2003

Appl. No.:

10/369914

Inventors:

Thorsten Schmidt - Milpitas CA, US

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka

International Classification:

G11B 5/09
G11B 5/965
G11B 21/02

US Classification:

360 7708, 360 53, 360 75

Abstract:

In order to increase the performance and reliability of devices including rotatable storage media, individual characteristics of device elements or heads can be determined and used to set performance criteria. The off-track capability and track mis-registration of an element or head can be determined and used to set individualized end-of-seek criteria for elements or heads of devices including rotatable storage media.

US Patent:

7027255, Apr 11, 2006

Filed:

Feb 18, 2003

Appl. No.:

10/369949

Inventors:

Thorsten Schmidt - Milpitas CA, US

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka

International Classification:

G11B 5/596

US Classification:

360 7708

Abstract:

In order to increase the performance and reliability of devices including rotatable storage media, individual characteristics of device elements or heads can be determined and used to set performance criteria. The off-track capability and track mis-registration of an element or head can be determined and used to set individualized thresholds for elements or heads of devices including rotatable storage media.

US Patent:

7061708, Jun 13, 2006

Filed:

Dec 15, 2004

Appl. No.:

11/013075

Inventors:

Richard M. Ehrlich - Saratoga CA, US
Thorsten Schmidt - Milpitas CA, US

Assignee:

Matsushita Electric Industrial Inc. - Osaka

International Classification:

G11B 21/02
G11B 5/596
G11B 5/09

US Classification:

360 75, 360 7708, 360 48

Abstract:

Embodiments of the present invention determine the offset of a first burst of a burst pair from a centerline. This can be used to determine the desired offset position for a second burst of the burst pair. The target signal to provided the data storage unit for writing the second burst can take into account the transfer function of the controller and the physical plant so as to more accurately write at the desired offset position.

Author:

Thorsten Schmidt

ISBN #:

3928977903