1
Tatsuto Suetomi: Disc reproducing apparatus. Sony Corporation, Limbach & Limbach L, April 14, 1998: US05740143 (181 worldwide citation)

A reproducing apparatus for a disc-shaped recording medium having digital audio signals recorded in a compressed form includes an optical head, a spindle motor, a servo control unit, a decoder, a memory and a controller. The optical head radiates a light beam on the disc-shaped recording medium for ...


2
Robert W Warren Jr, Mark D Hagen: Disk drive having a sector clock that is synchronized to the angular speed of the spindle motor. Western Digital Technologies, Jason T Evans Esq, Young Law Firm, October 24, 2006: US07126776 (176 worldwide citation)

The present invention compensates for variations in the angular velocity of the drive's spindle motor by periodically dropping clocks to a counter based upon the previous servo wedge-to-wedge timing. This enables a substantially constant count to be maintained between servo wedges and allows a more ...


3
Noureddine Kermiche, Scott A St John: Disk drive determining operating fly height by detecting head disk contact from disk rotation time. Western Digital, Howard H Sheerin Esq, September 1, 2009: US07583466 (155 worldwide citation)

A disk drive is disclosed including a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors and a plurality of servo sectors. The disk drive further comprises a spindle motor for rotating the disk, and a head actuated radially over the disk, wherein the head com ...


4
Robert P Ryan, Dalwinder Singh: Self-heating disk drive. Western Digital Technologies, Jason T Evans Esq, Blakely Sokoloff Taylor & Zafman, April 10, 2007: US07203021 (155 worldwide citation)

Disclosed is a self-heating disk drive that comprises a voice coil motor (VCM), a spindle motor, and a temperature sensor. The VCM includes a VCM coil and the VCM is configured to move an actuator having a head attached to a distal end of the actuator. The spindle motor includes a plurality of spind ...


5
Hakam D Hussein: Disk drive employing power source modulation for reducing power consumption. Western Digital Technologies, Milad G Shara, September 4, 2001: US06285521 (145 worldwide citation)

A disk drive includes a disk having data tracks including servo sectors and data regions disposed between the servo sectors. A transducer head writes data to and reads data from the data regions and reads servo information from the servo sectors. A spindle motor rotates the disk. A spindle motor dri ...


6
John E Scura, Hossein M Moghadam: Spindle motor hub having equivalent MR read element bias voltage to mitigate potential between disk and MR read element. Western Digital Technologies, Milad G Shara Esq, Stetina Brunda Garred & Brucker, June 24, 2003: US06583968 (141 worldwide citation)

An aspect of the invention can be regarded as a disk drive that includes a disk drive base and a magnetic disk. The disk drive further includes a rotary actuator coupled to the disk drive base. The rotary actuator has an MR read element disposed adjacent the magnetic disk. The MR read element has a ...


7
Timothy A Ferris, Raffi Codilian: Disk drive employing spindle motor commutation time variation for reducing acoustic noise. Western Digital Technologies, Milad G Shara Esq, Howard H Sheerin Esq, December 10, 2002: US06493169 (133 worldwide citation)

A disk drive incidentally generates undesirable acoustic noise during an operation mode and includes a spindle motor having windings and a rotor rotatable at an operating spin-rate during the operation mode. A commutation state sequencer includes a sequence of commutation states including a present ...


8
Hanan Kupferman: Disk drive having one or more partial servo wedges that includes a short servo sync mark that is different than the servo sync word of full servo wedges. Western Digital Technologies, Alan W Young Esq, May 16, 2006: US07046465 (131 worldwide citation)

A disk drive has a spindle motor, a disk mounted for rotation on the spindle motor, and a head for reading from and writing to the disk. The disk includes a recording surface having a track that includes a first full servo wedge and a second full servo wedge, each of the first full and second full s ...


9
Bang X Phan, David Dung Tien Nguyen, Zhi Wang: Disk drive computing repeatable run out while actuator arm is pressed against crash stop. Western Digital Technologies, Howard H Sheerin Esq, September 4, 2007: US07265933 (129 worldwide citation)

A disk drive is disclosed comprising a voice coil motor (VCM) for rotating an actuator arm about a pivot in order to actuate a head over a disk. The disk is rotated by a spindle motor, and a feed-forward compensation value is computed that compensate for a non-centric alignment of the disk with resp ...


10
Robert P Ryan: Disk drive comprising an actuator driver circuit for retracting a head independent of a servo microprocessor when a spindle speed fault mode is detected. Western Digital Technologies, Milad G Shara Esq, November 5, 2002: US06476996 (124 worldwide citation)

A disk drive comprising a disk having a data area, a head, a spindle motor for spinning the disk, and an actuator for positioning the head over the data area during a spindle speed control mode, and retracting the head away from the data area during a spindle speed fault mode is disclosed. A servo m ...