Hamid F Ghazvini

US Patent:

7255636, Aug 14, 2007

Filed:

Jun 16, 2005

Appl. No.:

11/153685

Inventors:

Yong Hu - Fremont CA, US
Pranesh K. Swamy - San Jose CA, US
Eric K. Dahlin - San Jose CA, US
Hamid F. Ghazvini - San Jose CA, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

B24B 25/00

US Classification:

451319, 451324, 451552, 2960312, 3602354, 3602364, 360237

Abstract:

A hybrid burnishing head for processing of surfaces of hard disk media comprises a solid body including a first major surface and a second, opposed major surface comprising a burnishing surface including first and second surface portions, wherein the first surface portion is configured for providing air bearing stability and flyability of the head over the media surface, the second surface portion is configured for providing burnishing of a media surface, and the first and second surface portions are operatively decoupled for simultaneously providing optimized air bearing stability/flyability and burnishing aggressiveness for a particular application.

US Patent:

8137163, Mar 20, 2012

Filed:

Mar 16, 2009

Appl. No.:

12/405031

Inventors:

Weimin Qian - Mountain View CA, US
Igor V. Sytine - Plymouth MN, US
Matthew Aaron Carper - Minneapolis MN, US
Pranesh Swany - Tracy CA, US
Eric K. Dahlin - San Jose CA, US
Hamid F. Ghazvini - San Jose CA, US

Assignee:

Seagate Technology LLC - Cupertino CA

International Classification:

B24B 5/00

US Classification:

451324, 451540, 451 5, 451552, 3602359

Abstract:

A disc burnishing head includes an array of burnishing pads and a first and second side rail projecting from a bottom surface of a slider body. The side rails each have an inside surface facing the burnishing pads and an outside surface facing outward. The outside surface of at least the first side rail is serrated. The serrations define a plurality of teeth and notches on the outside surface of the first side rail for cutting, cleaning, and conditioning defects from the surface of a disc.

US Patent:

8619528, Dec 31, 2013

Filed:

Aug 31, 2011

Appl. No.:

13/223199

Inventors:

Hamid Ghazvini - San Jose CA, US
David Kuo - Palo Alto CA, US
Minh Huong Le - San Jose CA, US
Kim Yang Lee - Fremont CA, US
HongYing Wang - Fremont CA, US
Nobuo Kurataka - Campbell CA, US
Yautzong Hsu - Fremont CA, US
Henry Hung Yang - San Jose CA, US

Assignee:

Seagate Technology LLC - Cupertino CA

International Classification:

G11B 20/00

US Classification:

369 531, 369 4426, 3562373, 264293

Abstract:

A system and method of calibrating optical measuring equipment includes optically measuring discrete objects of a first known predictable pattern from a calibration apparatus, wherein the first known predictable pattern is a bit pattern. A recording surface optical reader is calibrated based on the optically measuring. Using the first known predictable pattern, contamination is filtered from the results of the optically measuring.

US Patent:

20050022586, Feb 3, 2005

Filed:

Jul 29, 2003

Appl. No.:

10/628390

Inventors:

Yong Hu - Union City CA, US
Eric Dahlin - San Jose CA, US
Shih-Fu Lee - Fremont CA, US
Hamid Ghazvini - San Jose CA, US
Elias Johnson - Apple Valley MN, US

International Classification:

G01B007/34
G11B033/10
G01B011/30

US Classification:

073105000, 360025000, 356600000

Abstract:

A system and a method for measuring micro-waviness of a magnetic recording disk using a high-speed glide test are disclosed. The HSG test is a viable production-level test methodology for high performance media that require well-controlled and low micro-waviness.

US Patent:

20070111645, May 17, 2007

Filed:

Nov 16, 2005

Appl. No.:

11/281166

Inventors:

Yong Hu - Fremont CA, US
Eric K. Dahlin - San Jose CA, US
Hamid F. Ghazvini - San Jose CA, US
Pranesh K. Swamy - Tracy CA, US

International Classification:

B24B 1/00

US Classification:

451063000

Abstract:

A skewed burnishing head arrangement is provided for burnishing the surface of a disc. The skewing of the burnishing head relative to the diameter perpendicular to a sweeping direction provides improved wiping action that catches loose particles and surface contamination, as well as performing aggressive asperity cutting and surface conditioning, while preventing particles from being embedded into a disc surface.