Herman Ferrier

US Patent:

6574174, Jun 3, 2003

Filed:

Apr 15, 2000

Appl. No.:

09/549075

Inventors:

James R. Amble - Redwood City CA
Mark E. McDonald - Milpitas CA
Michael V. Morelli - San Jose CA
Andrew J. Daiber - Palo Alto CA
Herman A. Ferrier - Scotts Valley CA
Sanjoy Ghose - Scotts Valley CA
Thomas A. Kridl - Los Altos CA
Matthew Lipson - Sunnyvale CA
Shunichi Nishimura - Tokyo, JP
Sergei Sochava - Sunnyvale CA
LeRoy A. Volz - San Jose CA

Assignee:

Siros Technologies, Inc. - Davis CA

International Classification:

G11B 700

US Classification:

369 4426, 369 4437, 369 94

Abstract:

An optical information storage system using optical storage media including multiple data layers or stacks wherein each of the multiple data stacks has a storage density comparable to a conventional single layer optical disk. The optical data storage system comprises an optical medium having a single dedicated servo layer and multiple data stacks which each contain an embedded servo format, a servo laser beam positioned to maintain a first focus point on the dedicated servo reference layer, a read-write laser beam positioned to maintain a second focus point on one of the data stacks, a first, dedicated servo system which provides focus and tracking error correction according to error signals generated from the dedicated servo layer, and a second, embedded servo system which provides focus and tracking error correction according to error signals generated from the data stacks. The dedicated servo layer, in different embodiments of the invention, may be positioned either below or above the data stacks in the optical medium, or interposed between data stacks. The data stacks may comprise discrete physical data layers or âvirtualâ data layers defined by a format hologram.

US Patent:

7131346, Nov 7, 2006

Filed:

Oct 15, 2004

Appl. No.:

10/966543

Inventors:

Jagdeep S. Buttar - Fremont CA, US
David Terrill - Walnut Creek CA, US
Kenneth R. Davies - Gilroy CA, US
Herman Ferrier - Scotts Valley CA, US
Xiaodong Che - Saratoga CA, US

Assignee:

Western Digital (Fremont), Inc. - Fremont CA

International Classification:

G11B 5/56
G01R 33/12

US Classification:

738659, 324212, 3602944

Abstract:

Head stack fixtures for securing head stack assemblies to spin stand testing systems, and spin stand testing systems incorporating such fixtures, are disclosed. Exemplary head stack fixtures comprise a base supporting a piezoelectric actuator. The base includes an attachment mechanism for securing the HSA in such a way that the HSA will pivot relative to the base. When the HSA is secured to the base, the piezoelectric actuator engages the HSA. The piezoelectric actuator is therefore able to pivot the HSA relative to the base for fine positioning of a head of the HSA.

US Patent:

20040001400, Jan 1, 2004

Filed:

Mar 27, 2002

Appl. No.:

10/109431

Inventors:

James Amble - Milpitas CA, US
Herman Ferrier - Scotts Valley CA, US
LeRoy Volz - San Jose CA, US
Andrew Diaber - Palo Alto CA, US

Assignee:

Siros Technologies, Inc., a California Corporation

International Classification:

G11B007/095

US Classification:

369/044260, 369/044290, 369/103000

Abstract:

The disclosed device is directed towards an optical data storage system. The optical data storage system comprises an optical medium including a servo plane and at least one data plane. A first laser is positioned to generate a servo laser beam and address the servo plane with a first servo focus spot. A second laser is positioned to generate a read-write laser beam and address the data plane with a second read-write focus spot. A first servo system is associated with the first laser and is configured to provide focus and tracking error correction according to servo information associated with the servo plane. A second servo system is associated with the second laser and is configured to provide focus and tracking error correction according to servo information associated with the data plane.