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James A Henson, James P McGrath, Bruce R Peterson, Tim R Glassburn, Michael L Raab, James H Do: Shared memory array for data block and control program storage in disk drive. Quantum Corporation, David B Harrison, November 7, 1995: US05465343 (93 worldwide citation)

An improved disk drive architecture includes a microcontroller interface circuit connected between a drive microcontroller and a buffer controller. The microcontroller interface circuit includes address mapping registers for mapping at least one predetermined portion of directly addressable memory o ...


2
Parminder Gill, Clifford M Gold, James A Henson: Time allocation shared memory arbitration for disk drive controller. Quantum Corporation, Michael Zarrubian, January 23, 2001: US06178486 (75 worldwide citation)

A method and apparatus for arbitrating requests for access to a single buffer memory embedded within a disk drive in which a disk data channel is assigned a highest priority for buffer access within a queue. An arbitration cycle progressively services access requests pending within the queue, beginn ...


3
Nathan J Hays, James A Henson, Christopher M Carpenter, William R Akin Jr, Richard M Ehrlich, Lance D Beazley: Position feedback system for volume holographic storage media. Quantum Corporation, John C Chen, David B Harrison, July 7, 1998: US05777760 (43 worldwide citation)

A method of holographic recording in a photorefractive medium wherein stored holograms may be retrieved with maximum signal-to noise ratio (SNR) is disclosed. A plurality of servo blocks containing position feedback information is recorded in the crystal and made non-erasable by heating the crystal. ...


4
Horia Cristian Simionescu, Luan Kha Bui, James A Henson, Clifford M Gold: Embedded cache manager. Quantum Corporation, Michael Zarrabian, October 31, 2000: US06141728 (41 worldwide citation)

A method for managing data blocks in a cache buffer defining date block segments, and for automatically transferring data into and out of the cache buffer. A cache list comprises a plurality of entries each including information identifying a corresponding cache segment, and a set of consecutive dat ...


5
Michael D Leis, Ara Patapoutian, Mathew P Vea, Richard M Ehrlich, Kevin D Fisher, James A Henson, William R Akin Jr: Synchronous detection of wide bi-phase coded servo information for disk drive. Quantum Corporation, David B Harrison, January 19, 1999: US05862005 (34 worldwide citation)

A magnetic disk drive data storage disk defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in accordance with a code having a predetermined distance and user data code rate. Each servo spoke of the re ...


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Michael D Leis, Ara Patapoutian, Mathew P Vea, Richard M Ehrlich, Kevin D Fisher, James A Henson, William R Akin Jr: Synchronous detection of wide bi-phase coded servo information for disk drive. Maxtor Corporation, September 17, 2002: US06452990 (29 worldwide citation)

A magnetic disk drive data storage disk defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in accordance with a code having a predetermined distance and user data code rate. Each servo spoke of the re ...


7
James A Henson, Scott E Richmond, William R Akin Jr: Glitchless frequency-adjustable ring oscillator. Quantum Corporation, David B Harrison, November 28, 1995: US05471176 (25 worldwide citation)

A clock generation circuit includes a reference clock for putting out a stable reference clocking signal. A digital ring oscillator includes a series circuit loop having at least one inverting gate and a programmable delay line of plural delays formed a series of tapped digital transmission gates co ...


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Nathan J Hays, James A Henson, Christopher M Carpenter: Position feedback system for volume holographic storage media. Quantum Corporation, jiang shixun, September 16, 1998: CN97190501

A method of holographic recording in a photorefractive medium wherein stored holograms may be retrieved with maximum signal to noise ratio (SNR) is disclosed. A plurality of servo blocks containing position feedback information is recorded in the crystal and made non-erasable by heating the crystal. ...