1
Richard J Blackborow, Peter S Hahn, Claude E Camp, Donald C Westwood, Rodica Florea, Eric J Botto, Scott E Richmond, David B Jeppson: Removable and transportable hard disk subsystem. Quantum Corporation, David B Harrison, August 20, 1991: US05041924 (153 worldwide citation)

A removable and transportable hard disk subsystem is provided for use with at least one computer and includes at least one hard disk module. The module contains a shock mounted, thin and compact micro-Winchester head and disk assembly which plugs into a base housing which is installable entirely wit ...


2
Richard M Ehrlich, Jong Lin, David B Jeppson, Kenji Oki: Hard disk drive having self-written servo burst patterns. Maxtor Corporation, February 11, 2003: US06519107 (151 worldwide citation)

A method for servowriting a magnetic hard disk drive includes servowriting a first servo burst pattern by using a servowriter coupled to a head-disk assembly within a clean room environment, self-writing at least a second servo burst pattern radially offset relative to the first burst pattern by rea ...


3
David B Jeppson: Adaptively-controlled disk drive assembly. Quantum Corporation, Michael Zarrabian, September 19, 2000: US06122131 (91 worldwide citation)

A disk drive assembly including circuitry for adaptively selecting performance characteristics of the assembly. The performance characteristics are adaptively selected responsive to a balancing of maximizing performance of the assembly while also minimizing occurrences of misoperation. A disk drive ...


4
Richard M Ehrlich, David B Jeppson: Digital multi-rate notch filter for sampled servo digital control system. Quantum Corporation, David B Harrison, June 28, 1994: US05325247 (72 worldwide citation)

A digital servo control loop for a disk drive head position actuator implements a multi-rate notch filter in order to eliminate actuator resonances at frequencies above the sampling rate Nyquist frequency. The control loop includes circuitry responsive to the periodic digital position values sampled ...


5
Richard J Blackborow, Peter S Hahn, Claude E Camp, Donald C Westwood, Rodica Florea, Eric J Botto, Scott E Richmond, David B Jeppson: Removable and transportable hard disk subsystem. Quantum Corporation, David B Harrison, October 12, 1993: US05253129 (64 worldwide citation)

A removable and transportable hard disk subsystem is provided for use with at least one computer and includes at least one hard disk module. The module contains a shock mounted, thin and compact micro-Winchester head and disk assembly which plugs into a base housing which is installable entirely wit ...


6
Richard J Blackborow, Peter S Hahn, Claude E Camp, Donald C Westwood, Rodica Florea, Eric J Botto, Scott E Richmond, David B Jeppson: Removable and transportable hard disk subsystem. Quantum Corporation, David B Harrison, November 12, 1991: US05065262 (40 worldwide citation)

A removable and transportable hard disk subsystem is provided for use with at least one computer and includes at least one hard disk module. The module contains a shock mounted, thin and compact micro-Winchester head and disk assembly which plugs into a base housing which is installable entirely wit ...


7
Gary W Calfee, David B Jeppson: Disk drive with closed loop commutator and actuator oscillator. Quantum Corporation, Michael Zarrabian, November 9, 1999: US05982571 (23 worldwide citation)

A disk drive having: (a) at least one data disk; (b) a brushless DC motor coupled to the data disk, the motor having: (i) multiple phase windings arranged as a stator, and (ii) a rotor having a permanent magnet or a DC current excitation winding for rotating the data disk; (c) a transducer for writi ...


8
David B Jeppson, Norman H Wulferdinger, Bryan J Mee, William N Thanos, Joseph C Liu: Servo pause for disk drive embedded multi-tasked controller. Quantum Corporation, David B Harrison, January 18, 1994: US05280603 (14 worldwide citation)

A method is provided for allocating digital processing activities of an embedded microcontroller within a disk drive between repetitive periodic digital servo loop service routines synchronized to rotation of a data storage disk of the drive and irregularly occurring host service routines supporting ...


9
David B Jeppson, Benjamin M Miller: Masterless synchronized spindle control for hard disk drives. Quantum Corporation, David B Harrison, May 16, 1995: US05416648 (7 worldwide citation)

A hard disk drive spindle synchronization method comprises the steps of: sending an index marker pulse generated within each disk drive to mark in time a beginning of each rotation of the disk spindle thereof to a party line to which all drives are connected, rotating the disk spindle at a slightly ...