Hewlett-packard Company

Hewlett-packard Development Company, L.p.

Jeffrey D Schwartz

Mark E Nash

Eric F Aas

Steven Frederick Liepe

Jennifer Joy Thayer

Neal A Krawetz

Justin E Forrester

Steve D Schoenbauer

Systems and methods for controlling motors are provided. In this regard, a representative system, among others, includes memory, a motor controller, and a motor. The memory is configured to store sequence information and the motor controller is configured to: receive instructions from a processing device of the system, receive the stored sequence information based on the received instructions, generate at least one drive signal based on the received sequence information, and transmit the at least one drive signal. The motor is configured to be operated based on the transmitted drive signal.

Systems and methods for controlling motors

A data management system comprises a processor adapted to receive a transfer of an update. The system also comprises an update manager accessible by the processor and adapted to obtain a listing identifying each of a plurality of data packets corresponding to the update. The update manager is further adapted to access the listing to determine a transfer status of each of the data packets in response to a partial transfer of the update.

Data management system and method

A computer security system comprises a motherboard comprising a processor and a memory. The system also comprises a drive device having an assigned identifier and coupled to the motherboard. The system further comprises a basic input/output system (BIOS) executable by the processor and adapted to compare the assigned identifier of the drive device with an identifier stored in the memory and boot the motherboard if the assigned identifier corresponds to the stored identifier.

System and method for securing a computer

A method for reducing power supply current surges and power supply voltage noise in an electric motor control system. The method limits the rate of change of power to the motor. The rate of change of power is limited by microprocessor firmware. Use of firmware reduces the size and weight requirements of motor control hardware and power supply filtering hardware.

Reduction of electric motor surge current by non-linear limiting of rate

A method of calibrating signal processing circuitry in a magnetic data storage device. The method ensures that an adequate signal-to-noise ratio is achieved when reading a head-position calibration signal. First, discrimination thresholds are set to an initial low value. Then, with wide bandwidth and stationary media, amplifier gain is calibrated by adjusting gain to make the amplitude of amplified background noise equal to the initial threshold value. Finally, bandwidth is reduced and the discrimination thresholds are raised to a final value. The final threshold value ensures that a signal must exceed a predetermined signal-to-noise ratio before the signal is accepted as being valid.

Using read channel noise to initialize read channel for head position

A method for reducing motor start-up current in an electric motor control system. The method first prevents flow of current through the motor while slowly charging a parallel capacitor. Then, the motor control voltage is reduced and current is switched through the motor. The motor control voltage remains reduced until the motor starts turning. After the motor starts turning, the control voltage is slowly increased as the motor accelerates, limiting the current from the power supply.

Current limiting for DC electric motor start-up

An apparatus and method for generating an index pulse by a data storage tape drive. The tape drive is controlled by a flexible disk controller. A multi-track tape is formatted into multiple data segments per track with erased areas between segments. A digital data signal from the tape signal processor is sampled to detect a lapse in data. Then, the analog data signal is continuously monitored to detect the reappearance of data. When filtered analog signal peaks exceed a fixed threshold, a pulse is generated from the tape drive to the flexible disk controller. In an alternative embodiment, to further protect against false triggering, index pulse generation is suppressed during most of each erased area between segments. In another embodiment, index pulse generation is suppressed if an erased area exceeds a length threshold, such as at the end of the tape. In still another embodiment, index pulse generation is suppressed if digital data reappears without triggering the analog monitoring circuit.

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Loveland, CO, United States of America

Jeffrey D Schwartz