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| Number | Title | Issue Date |
| 7330325 | Proactive fault monitoring of disk drives through phase-sensitive surveillance One embodiment of the present invention provides a system that proactively monitors a disk drive to detect an impending disk drive failure. During operation, the system obtains a time-varying electrical signal which is generated by the spindle rotation during operat... | 02/12/2008 |
| 7320039 | Method for processing consistent data sets The invention relates to a method for processing consistent data sets by asynchronous application of a subscriber in an isochronous, cyclical communication system. According to the invention, by connecting a communication memory and a consistency, transmission and r... | 01/15/2008 |
| 7280738 | Method and system for specifying a selection of content segments stored in different formats A method, system and program product are described for specifying a selection of content segments stored in different formats. The invention involves receiving specification of a plurality of portions of first content stored in a first format, the specification iden... | 10/09/2007 |
| 7245975 | Skew compensation A system and method for generating master and slave reference signals is disclosed, wherein at least one axis of the plurality of axes is a master section and at least one axis of the plurality of axes is a slave section, said slave section being a slave of said mas... | 07/17/2007 |
| 7202616 | Synchronous control method and device of the same A synchronous control device which is provided with drive motors and a central control unit generating a synchronous reference signal and with which the drive motor is controlled to rotate synchronously with the synchronous reference signal supplied from the central... | 04/10/2007 |
| 7196715 | Speed control using drive current profile Timing information from the label side of an optical disc is used to generate a drive current profile. The drive current profile can be applied to a spindle motor in order to maintain a rotational speed of the optical disc in the absence of the timing information. | 03/27/2007 |
| 7145855 | Method of controlling an optical disk drive by calculating a target frequency of a DPLL signal A control circuit for an optical disk drive includes a frequency detector, a phase detector, a low pass filter, a voltage-controlled oscillator (VCO), and a controller. The frequency detector and the phase detector both receive an eight-to-fourteen modulation (EFM) ... | 12/05/2006 |
| 7138782 | Motor control system and method of the same The present invention provides a motor control system and method thereof. The motor control system comprises a motor controller and a compensation device. The motor controller is used for generating a motor control output according to a reference signal and a first ... | 11/21/2006 |
| 7092184 | Monitoring a sensor's output using a target window that is based on a longitudinal offset's position-dependent indicator Using a “reference” sensor, a reference position is detected in a frame of reference that is moving along a predetermined path relative to the reference sensor. The reference position is used to derive a position-dependent indicator of a position-dependent “lo... | 08/15/2006 |
| 7079341 | Multiple disk, variable RPM data storage system for reducing power consumption A data storage system includes a set of disks where each disk is operable in a plurality of discrete angular velocity levels. A disk controller controls the angular velocity of each active disk. The controller replicates a first portion of data on a plurality of the... | 07/18/2006 |
| 7006418 | Optical disk device that monitors chip temperature of a drive and controls its operation based on the chip temperature Monitor circuits monitor junction temperatures of chips of driver ICs which drive a driving part of a recording/reproduction system. Comparison circuits compare the junction temperatures with respective arbitrarily set temperatures to output temperature flags as com... | 02/28/2006 |
| 6992853 | Method and apparatus for determining modulated, amplitude ramping RRO harmonics in multi-screw clamped HDD disk/spind assembly A method for algorithmically determining, based on the number of screws used to hold the disks of a disk drive, harmonics of repeatable runout error during disk drive operation, such that correction of the error by feed forward techniques is facilitated. ... | 01/31/2006 |
| 6972922 | Disk drive having internal data structures for efficiently storing repeatable runout cancellation information A disk drive includes a sampled servo controller for periodically adjusting a control effort signal during a track-following operation based on embedded distributed position information and repeatable runout (RRO) cancellation values for reducing effects of RRO in t... | 12/06/2005 |
| 6969961 | Method for controlling a rotation speed of a slave drive, a corresponding controller and a corresponding machine A method for controlling the rotation speed of a slave drive is described, where a reference rotation speed and a reference position is provided to a controller. The controller determines an estimated acceleration curve for the slave drive based on an instantaneous ... | 11/29/2005 |
| 6961238 | Electronic device A disk device comprises an HDD, dampers, PCB, and case that houses the HDD, dampers and PCB. The connection direction of the connector of the HDD differs from that of the connector of the PCB by an angle of 90°. A flat cable connecting the connectors is angled at t... | 11/01/2005 |
| 6928470 | Transferring scheduling data from a plurality of disk storage devices to a network switch before transferring data associated with scheduled requests between the network switch and a plurality of host initiators A network switch is disclosed for resolving requests from a plurality of host initiators by scheduling access to a plurality of disk storage devices. The network switch comprises a switched fabric comprising a plurality of switching elements. Each switching element ... | 08/09/2005 |
| 6917577 | Method for determining position of optic pick-up head and device of the same A method for determining the position of an optic pick-up head and the device of the same are disclosed. The number of frames in certain section of the disk are used to determine the position of the optic pick-up head. The number of frames in inner section of the co... | 07/12/2005 |
| 6819072 | Disk drive servo arm retract and spindle brake circuit A spindle motor control circuit for controlling a motor; including a control circuit to control the motor during at least a low state, a pulse state and a high state, the motor braking during said low state, the control circuit receiving a flyback voltage from the m... | 11/16/2004 |
| 6788532 | Portable computer of multifunction type An apparatus (e.g. a portable computer) is provided which includes a peripheral device (e.g. a hard disk) and a bracket. The bracket maybe configured to rigidly attach the peripheral device to the apparatus. Further, the bracket may be configured to guide the periph... | 09/07/2004 |
| 6771883 | Device and method for controlling tape travelling speed and medium for recording its control program The travelling speed of a magnetic tape is controlled without considering a detection error caused by the slackening of a magnetic tape or the like. A microcomputer 10, immediately after starting a fast-feeding operation, starts a running rotation of feeding ... | 08/03/2004 |
| 6617817 | Electrical time constant compensation method for switched, voltage-mode driver circuit A power driver for driving a signal on a load using voltage-mode driver. A system processor generates commands indicating a programmed drive signal desired from the voltage-mode driver. A lead compensator determines a compensated command to compensate for... | 09/09/2003 |
| 6603625 | Spindle synchronizing a plurality of spindles connected to a multi-dimensional computer network A multi-dimensional computer network is disclosed comprising a multi-dimensional network controller for interconnecting a plurality of computer devices, including a plurality of disk drives, communicating via a network protocol through a plurality of node... | 08/05/2003 |
| 6538840 | Automatic method for optimizing throughput in a disc drive A disc drive includes a base and a disc rotatably attached to the base. The disc drive also includes an actuator assembly rotatably attached to said base and a device for moving the actuator assembly. The actuator assembly includes a transducer head in a ... | 03/25/2003 |
| 6415349 | Disk drive with unified channel-disk controller bus for transmitting user data, servo data, and register data A disk drive has a unified bus forming a signal path for transmitting register data, user data and servo sectors. The unified bus is connected between a channel circuit and a disk controller circuit. The channel circuit has an output stream engine which r... | 07/02/2002 |
| 6134068 | Disk drive spindle synchronization apparatus and method A data storage disk drive array is synchronized using drives wherein each has an onboard oscillator assembly which is connected either for independent operation of each drive or synchronization of all or any selected drives of the array using a common or ... | 10/17/2000 |
| 6108286 | Method and apparatus for buffering variable-rate data Data (such as digital audio data) is reproduced from a disk medium at a variable data rate and is then converted to a constant data rate by storing the reproduced data in a buffer memory and reading out the stored data at the constant data rate. Overload ... | 08/22/2000 |
| 5999357 | Method and apparatus for spindle synchronization to reduce drive to drive runout A method and apparatus for improving data integrity and density in an array of disk drives by synchronizing spindles prior to correcting for repeatable runout (RRO). The invention includes a drive control circuit for controlling synchronization, initiatin... | 12/07/1999 |
| 5877913 | Rotation synchronous control system In a rotation synchronous control system comprising a host controller and a plurality of units connected to the host controller, each of the plurality of units having a rotation device, the system having a spindle sync function for the rotation devices to... | 03/02/1999 |
| 5877623 | Method for measuring recording linear velocity of data on compact disk A method is disclosed for measuring the linear velocity of recording of data recorded a CD using a Hall sensor. A Hall sensor is placed in the spindle motor of a CD drive to produce a signal based on alternating magnetic flux in the spindle motor. An ampl... | 03/02/1999 |
| 5864216 | Recording and reproducing apparatus having no capstan and no pinch roller and method of controlling the same A recording and/or reproducing apparatus which includes no pinch roller and no capstan and wherein the converging time to a rated speed upon starting of feeding of a tape can be reduced and the tape can be fed stably at the rated speed during recording an... | 01/26/1999 |
| 5841604 | Masterless spindle synchronization in a multiple disk drive storage system In a storage system using multiple disk drives, the disk drive spindles are rotated at the same frequency and at a predetermined phase relationship. A phase angle, measured as the difference between an index mark recorded on the disk and the disk's read h... | 11/24/1998 |
| 5821719 | Recording and reproducing apparatus having no capstan and no pinch roller and method of controlling the same A recording and/or reproducing apparatus which includes no pinch roller and no capstan and wherein the converging time to a rated speed upon starting of feeding of a tape can be reduced and the tape can be fed stably at the rated speed during recording an... | 10/13/1998 |
| 5818657 | Disk drive with impulse torque generating element A method and system for overcoming force which inhibits movement of a data storage device are provided. The invention includes generating momentum in a moveable member and then utilizing the momentum of the moveable member to generate a large impulse forc... | 10/06/1998 |
| 5796540 | Method and apparatus for synchronizing the rotations of data storage disks in a plurality of disk storage devices A synchronization technique is described which finds use in a disk array subsystem comprising a plurality of disk storage devices connected to a controller. In response to signals from each of the devices specifying their angular position at a particular ... | 08/18/1998 |
| 5650885 | Device having synchronized spindle control in disk drives with at least two data per rotation of a disk In order to bring and keep a slave phase of rotation of a slave spindle into and in synchronism with a master phase, the master phase is represented in a predetermined time duration by zeroth through (N-1)-th master region data with an N-th master region ... | 07/22/1997 |
| 5598303 | Method and apparatus for synchronizing the rotations of data storage disks in a plurality of disk storage devices A synchronization technique is described which finds use in a disk array subsystem comprising a plurality of disk storage devices connected to a controller. In response to signals from each of the devices specifying their angular position at a particular ... | 01/28/1997 |
| 5555140 | Synchronized spindle control in disk drives with at least two data per rotation of disk In order to bring and keep a slave phase of rotation of a slave spindle into and in synchronism with a master phase, the master phase is represented in a predetermined time duration by zeroth through (N-1)-th master region data with an N-th master region ... | 09/10/1996 |
| 5552943 | Apparatus and method for accessing a location on a magnetic tape Access to a location on a tape along a transportation path thereof is controlled by controlling a revolution velocity of a reel motor based on a distance from a current location of the tape to a preselected location thereon, and in accordance with an esti... | 09/03/1996 |
| 5541781 | Method for synchronizing digital audio tape recorders A method for synchronously operating two or more rotary head digital audio tape recorders without having to dedicate a separate timing track. The present invention synchronizes the machines in three steps. First, the slave unit reads the time code value f... | 07/30/1996 |
| 5539591 | Integrated, multi-track driven, two device control system The invention is generally directed to a device which receives control signals and is selectively capable of serially controlling an auxiliary device. According to one aspect of the invention, the controlling device is operable in a first mode where contr... | 07/23/1996 |
