Norman D. Gardner - Aliso Viejo CA, US Robert P. Ryan - Mission Viejo CA, US
Assignee:
Western Digital Technologies, Inc. - Lake Forest CA
International Classification:
G11B005/596
US Classification:
360 7804, 360 75
Abstract:
A disk drive is disclosed employing an offset-nulling amplifier for detecting a back EMF voltage of a voice coil motor (VCM) in a velocity mode servo control system. The offset-nulling amplifier comprises a differential amplifier, an input stage for swapping the polarity of the input voltage at a periodic interval, and an output stage comprising a single-ended amplifier having an input switched at the periodic interval between the positive and negative outputs of the differential amplifier.
Acceleration Disturbance Detection Subsystem For Use With Disk Drives
Raffi Codilian - Irvine CA, US Lan V. Ngo - Garden Grove CA, US Norman D. Gardner - Aliso Viejo CA, US
Assignee:
Western Digital Technologies, Inc. - Lake Forest CA
International Classification:
G11B 19/04 G11B 21/02 G11B 19/02
US Classification:
360 60, 360 69, 360 75
Abstract:
A disk drive comprising a first sensor mounted on a nominally stationary portion of the disk drive and adapted to detect acceleration disturbances of the disk drive. The disk drive further comprising: a dual-function subsystem having a first circuit adapted to provide a write-inhibit signal and a second circuit adapted to provide a feed-forward basis signal, the dual-function subsystem adapted to receive a first sensor signal from the first sensor and to provide (a) the write-inhibit signal based on the received first sensor signal and a first threshold value, and (b) the feed-forward basis signal based on the received first sensor signal.
Apparatus Comprising A Brown-Out Protection Circuit For Memory Devices
Norman D. Gardner - Mission Viejo CA, US Mingying Gu - Aliso Viejo CA, US
Assignee:
Western Digital Technologies, Inc. - Irvine CA
International Classification:
H02H 3/24
US Classification:
361 92
Abstract:
An apparatus and method for regulating an output voltage (V) of a voltage regulator during a brown-out condition is described. The apparatus comprises the voltage regulator, a brown-out protection circuit, a switch, and a first capacitor. The voltage regulator charges the first capacitor to the regulated output voltage V. The brown-out protection circuit is coupled to the voltage regulator and the switch. In operation, the brown-out protection circuit detects the occurrence of an undervoltage condition based on a first undervoltage detection signal received at an undervoltage detection input, the brown-out protection circuit disables the voltage regulator and closes the switch to discharge the first capacitor to below a predetermined voltage level.
Data Storage Device Evaluating Frequency Range Of Supply Voltage To Detect Power Failure
A data storage device (DSD) is disclosed comprising a non-volatile memory (NVM), such as a disk or non-volatile semiconductor memory, and control circuitry for detecting a power failure condition. A frequency range of a supply voltage from a first frequency to a second frequency is extracted, wherein the first frequency is greater than ten hertz, the second frequency is higher than the first frequency, and the second frequency is less than one megahertz. The power failure condition is detected in response to the extracted frequency range of the supply voltage.
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Company / Classification
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Mr Norman Gardner Member
Castle Rock Auto LLC Auto Dealers - Used Cars
1415 Mississippi Ave, Eugene, OR 97403 5412068455, 5413444147
Norman Gardner President
Castlerock Auto LLC Automotive Repair Shops
1301 City View St, Eugene, OR 97402
Norman Gardner Mbr, President
Castlerock Auto LLC Automotive Repair · Other Automotive Mechanical and Electrical Repair and Mainte
1301 City Vw St, Eugene, OR 97402 5412068455
Norman A. Gardner President
NOCOPI INTERNATIONAL, INC
Norman Gardner Principal
Castlerock Auto General Auto Repair
1415 Mississippi Ave, Eugene, OR 97403 5415057060
Norman Gardner President
Castlerock Industries, Inc General Automotive Repair Shop
4055B Franklin Blvd, Eugene, OR 97403 2037 Campus Dr, Medford, OR 97504 4055 Franklin Blvd, Eugene, OR 97402 2467 Colbath Ave, Van Nuys, CA 91405 5412068455
Norman Gardner Director
Government of The Province of British Columbia Trade & Tourism