Gurinder Singh

6466257, Oct 15, 2002

Nov 1, 1999

09/431020

Eric Gordon Baugh - San Jose CA
Myron Dale Flickner - San Jose CA
Stephen Arnold Olson - Palo Alto CA
Gurinder Pal Singh - San Jose CA

International Business Machines Corporation - Armonk NY

H04N 947

348 95, 348 94, 382151, 382218

A method and tool for measurement of the roll static attitude and y-misalignment of magnetic recording sliders within the head stack assembly having reference elements placed on the deposited end of the magnetic recording slider, which are optically analyzed by a video camera connected to a computer. For fast measurement the head stack assembly is clamped in a fixture mounted on motorized stages, which move each slider into the measurement position. In a two step imaging and analyzing process, the orientation and location of one or more edges of the reference element are computed and compared with known control parameters.

6714382, Mar 30, 2004

Oct 13, 2000

09/687234

Pantelis S. Alexopoulos - San Jose CA
Lee K. Dorius - San Jose CA
Francis Chee-Shuen Lee - San Jose CA
Timothy C. OSullivan - San Jose CA
Gurinder Singh - San Jose CA

Hitachi Global Storage Technologies

G11B 560

3602358

The present invention provides a non-actuatable, self-limiting wear contact pad slider and method for making the same. A protruding element surrounding the transducer is fabricated using a third etch step so that the protruding element has a height that is greater than or equal to the designed fly height of the aerodynamic lift surface minus the disk roughness.

6762909, Jul 13, 2004

Aug 2, 2002

10/212575

Thomas R. Albrecht - Zurich, CH
Charles A. Brown - San Jose CA
Gurinder P. Singh - San Jose CA
Herman Russell Wendt - San Jose CA

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

G11B 3314

360 9702

A magnetic recording disk drive has self-limiting wear contact type air-bearing sliders that support the read/write heads. The magnetic elements of the read/write head extend into and are surrounded by a wearable pad that protrudes beyond the air-bearing surface of the slider. The end of the protrusion pad and the ends of the magnetic elements are covered by a corrosion-resistant overcoat that protects the magnetic elements during slider fabrication and disk drive assembly. The overcoated protrusion pad sliders are assembled into the disk drive in a special environment, typically air with humidity controlled below a level above which corrosion of the magnetic elements would occur. The drive is then hermetically sealed and the drive is operated with the protrusion pads in contact with the disks until the overcoats and a portion of the pads are worn or burnished away. The combination of protrusion pad air bearing sliders with a hermetically sealed disk drive in a controlled atmosphere, and the burnishing of the head overcoat either after the drive has been sealed or under controlled humidity conditions prior to sealing, allows for a very low magnetic spacing to be achieved in manufacturable disk drives.

6967818, Nov 22, 2005

Jul 16, 2003

10/620634

Peter Michael Baumgart - San Jose CA, US
Bernhard E. Knigge - San Jose CA, US
Robert N. Payne - San Jose CA, US
Gurinder Pal Singh - San Jose CA, US

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

G11B005/60
G11B017/02

3602347, 360 9702, 3602357, 3602365

The head of a disk drive has write elements disposed on one protrusion pad that wears away during initial operation to permit reduced tolerances and, thus, reduced spacing between the disk and head, with the read element being disposed on a separate protrusion pad and spaced from the write element pad in the radial dimension. This prevents read element recession during cooling in the absence of write current that could otherwise occur if the read element were located on the same pad as the write head.

7029590, Apr 18, 2006

Jun 20, 2003

10/600730

Pantelis S. Alexopoulos - San Jose CA, US
Lee K. Dorius - San Jose CA, US
Francis Chee-Shuen Lee - San Jose CA, US
Timothy C. O'Sullivan - San Jose CA, US
Gurinder Singh - San Jose CA, US

Hitachi Global Storage Technologies Netherlands B.V.

G11B 5/60

216 22, 21 41, 2960312, 2960315, 360113

The present invention provides a non-actuatable, self-limiting wear contact pad slider and method for making the same. A protruding element surrounding the transducer is fabricated using a third etch step so that the protruding element has a height that is greater than or equal to the designed fly height of the aerodynamic lift surface minus the disk roughness.

7660068, Feb 9, 2010

Sep 18, 2008

12/212739

Peter M. Baumgart - San Jose CA, US
John T. Contreras - Palo Alto CA, US
Luiz Franca-Neto - Sunnyvale CA, US
Bernhard E. Knigge - San Jose CA, US
Richard Kroeker - Morgan Hill CA, US
Gurinder P. Singh - San Jose CA, US

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

G11B 21/02
G11B 15/64

360 75, 3602344

In a method of pre-contact detection and active damping of air bearing vibrations in a hard disk drive, a slider is isolated from ground. The slider is then capacitively coupled with a hard disk of the hard disk drive via a thermal fly-height control (TFC) heating element. An alternating current (AC) signal is applied to the slider via the TFC heating element to control the amplitude of the slider.

7963022, Jun 21, 2011

Jul 17, 2007

11/778688

Peter Michael Baumgart - San Jose CA, US
Russell Dean Moates - San Jose CA, US
Jorge Rubio - San Jose CA, US
Gurinder Pal Singh - San Jose CA, US

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

G11B 21/24
G11B 5/53

2960303, 2960304, 29450, 29452, 403372, 3602445, 3602446

A method of swaging a head gimbal assembly (HGA) to an actuator arm comprises positioning a tubular element on the HGA adjacent a hole in the actuator arm; restraining the subassembly; providing a rod formed from a shape memory alloy (SMA), the SMA having a martensitic phase at a low temperature and an austenitic phase above a phase transition temperature that is higher than the low temperature, the rod having an initial diameter that is smaller than diameters of the tubular element and the hole; extending the rod through the tubular element and hole; heating the rod above the phase transition temperature such that the rod expands to a second diameter that is greater than the initial diameter to plastically deform the HGA and swage together the HGA and actuator arm to form an assembly; cooling the rod and removing the rod from the assembly such that the rod returns to the initial diameter.

8149541, Apr 3, 2012

Oct 17, 2008

12/253459

Peter Michael Baumgart - San Jose CA, US
Gurinder Pal Singh - San Jose CA, US

Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam

G11B 5/60

3602354, 360 75, 3602345, 360 59

A system according to one embodiment includes a thin film stack having a magnetic transducer and a contact pad; and a heater in the thin film stack for inducing thermal protrusion of a media-facing side of the thin film stack, wherein the thin film stack is characterized by the contact pad protruding farther than the magnetic transducer upon the thin film stack being heated by the heater. A method for calibrating a protrusion of a magnetic head includes increasing a thermal protrusion of a magnetic head to induce head-medium contact; determining that the head has contacted the medium, wherein a portion of the head that contacts the medium is a contact pad or overcoat of the contact pad; determining parameters for inducing a desired amount of protrusion based in part on the determination that the head has contacted the medium; and storing the parameters.