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Abhishek Dhanda

age ~40

from San Ramon, CA

Also known as:
  • Dhanda Abhishek
  • Abishek Dhanda

Abhishek Dhanda Phones & Addresses

  • San Ramon, CA
  • San Jose, CA
  • 25162 Charlinda Dr, Mission Viejo, CA 92691 • (949)2060982
  • Sunnyvale, CA
  • Lake Forest, CA
  • Boston, MA
  • Stanford, CA

Resumes

Abhishek Dhanda Photo 1

Technologist At Hgst, A Western Digital Company

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Position:
Technologist at HGST, a Western Digital company
Location:
San Francisco Bay Area
Industry:
Research
Work:
HGST, a Western Digital company since Apr 2013
Technologist

HGST, a Western Digital company Feb 2011 - Mar 2013
Research Staff Member

Western Digital Jun 2008 - Jan 2011
Senior Principal Engineer

Stanford University Jan 2004 - Jun 2008
Research Assistant
Education:
Stanford University 2004 - 2008
Ph.D., Mechanical Engineering
Stanford University 2002 - 2004
M.S., Mechanical Engineering
Indian Institute of Technology, Kharagpur 1998 - 2002
B.Tech., Mechanical Engineering
Skills:
Matlab
Design of Experiments
Failure Analysis
Simulations
Control Systems Design
Automatic Control
Optimization
R&D
Research
Modeling
Fuel Cells
Simulink
Solidworks
Microfabrication
Electrochemistry
Impedance Spectroscopy
Embedded Systems
Firmware
RTOS
System Identification
Optimal Control
Disk Drive
Convex Optimization
Model Predictive Control
Stochastic Modeling
Robotics
MEMS
Signal Processing
Awards:
Best Track Paper
ASME Conference on Information Storage & Processing Systems
Best Track Paper in Servo Control Technologies at ASME Conference on Information Storage & Processing Systems (ISPS)
Stanford School of Engineering Fellowship
Stanford University
Institute Silver Medal
Indian Institute of Technology (IIT) Kharagpur
Institute Silver Medal for outstanding academic performance at Indian Institute of Technology (IIT), Kharagpur
Abhishek Dhanda Photo 2

Abhishek Dhanda

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Us Patents

  • Disk Drive Rotating Phase Based Servo Bursts Based On Radial Location Of Head

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  • US Patent:
    7916422, Mar 29, 2011
  • Filed:
    May 28, 2010
  • Appl. No.:
    12/790608
  • Inventors:
    Guoxiao Guo - Foothill Ranch CA,
    Abhishek Dhanda - Mission Viejo CA,
    Jie Yu - Irvine CA,
  • Assignee:
    Western Digital Technologies, Inc. - Irvine CA
  • International Classification:
    G11B 5/596
    G11B 5/00
  • US Classification:
    360 7708, 360 76
  • Abstract:
    A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by a plurality of servo sectors, wherein each servo sector comprises a plurality of servo bursts, and each servo burst comprises a predetermined phase. After positioning the head over one of the servo tracks, a servo burst in one of the servo sectors is read to generate a read signal, and a sine and cosine component are extracted from the read signal. At least one of the sine and cosine components is rotated by an angle based on a radial location of the head. A position error signal for the head is generated in response to the rotated component.
  • Disk Drive Adjusting Servo Burst Signals To Compensate For Radial Velocity Of The Head

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  • US Patent:
    8531798, Sep 10, 2013
  • Filed:
    Dec 13, 2010
  • Appl. No.:
    12/966474
  • Inventors:
    Wei Xi - Mission Viejo CA,
    Abhishek Dhanda - Mission Viejo CA,
    Guoxiao Guo - Foothill Ranch CA,
    Jie Yu - Irvine CA,
  • Assignee:
    Western Digital Technologies, Inc. - Irvine CA
  • International Classification:
    G11B 5/596
  • US Classification:
    360 7814, 360 7804, 360 7708
  • Abstract:
    A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors that define a plurality of servo tracks, wherein the servo sectors comprise a plurality of servo bursts. A radial velocity of the head is detected relative to the servo tracks. At least two of the servo bursts are read to generate servo burst signals, and the servo burst signals are adjusted in response to the radial velocity of the head. A position error signal is generated for the head in response to the adjusted servo burst signals.
  • Disk Drive Estimating Reader/Writer Gap Across Servo Zones

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  • US Patent:
    8576506, Nov 5, 2013
  • Filed:
    Jun 21, 2012
  • Appl. No.:
    13/529817
  • Inventors:
    Honge Wang - Irvine CA,
    Michael Chang - San Jose CA,
    Abhishek Dhanda - San Jose CA,
    Huanxiang Ruan - Irvine CA,
    Guoxiao Guo - Irvine CA,
  • Assignee:
    Western Digital Technologies, Inc. - Irvine CA
  • International Classification:
    G11B 5/09
  • US Classification:
    360 50, 360 51, 360 39, 360 7708
  • Abstract:
    A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors defining a plurality of servo tracks. The servo tracks form a plurality of servo zones. A disk locked clock is synchronized relative to a servo data rate of the servo zone the head is over. A first reader/writer gap is measured in cycles of the disk locked clock at a first servo track in the first servo zone. A second reader/writer gap is measured in cycles of the disk locked clock at a second servo track in the second servo zone. The first and second reader/writer gaps are normalized to generate a normalized first and second reader/writer gaps. A third reader/writer gap is estimated in cycles of the disk locked clock at a third servo track in the second servo zone based on the normalized first and second reader/writer gaps.
  • Implementing Data Track Pitch Adjustment Under Operational Vibration Conditions

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  • US Patent:
    20130135764, May 30, 2013
  • Filed:
    Nov 29, 2011
  • Appl. No.:
    13/306736
  • Inventors:
    Abhishek Dhanda - San Jose CA,
    Toshiki Hirano - San Jose CA,
    Tetsuo Semba - San Jose CA,
    Zvonimir Z. Bandic - San Jose CA,
  • Assignee:
    Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
  • International Classification:
    G11B 27/36
  • US Classification:
    360 31, G9B 27052
  • Abstract:
    A method, apparatus and a data storage device are provided for implementing data track pitch adjustment for data written on a recordable surface of a storage device under operational vibration conditions. An operational vibration disturbance spectrum is detected during a write operation and the data track pitch is selectively adjusted based on the detected operational vibration disturbance spectrum. The adjusted track pitch information is saved and used during a read operation.
  • Method And Structure For Improving Performance And Storage Density In A Data Storage Device

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  • US Patent:
    20140055883, Feb 27, 2014
  • Filed:
    Aug 24, 2012
  • Appl. No.:
    13/593991
  • Inventors:
    Abhishek Dhanda - San Jose CA,
    Toshiki Hirano - San Jose CA,
    Tetsuo Semba - San Jose CA,
  • Assignee:
    HGST NETHERLANDS B.V. - Amsterdam
  • International Classification:
    G11B 5/596
  • US Classification:
    360 7708, G9B 5216
  • Abstract:
    A data storage device with improved data storage densities, coupled with lower hard error and write-inhibit events is described. A feed-forward write inhibit (FFWI) method enables data tracks to be written more densely. Alternatively, the FFWI method may reduce the hard error and write inhibit events to improve data storage performance. A concept of virtual tracks enables the FFWI method to be applied to the writing of circular data tracks with non-circular servo tracks, or to the writing of non-circular data tracks with PES data from circular servo tracks—in both cases, improvements to performance and/or storage densities are enabled. The FFWI method may also be applied to the case of both non-circular servo and data tracks.
  • Disk Drive Excluding Servo Sub-Bursts When Computing Position Error Signal

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  • US Patent:
    7898762, Mar 1, 2011
  • Filed:
    Oct 21, 2009
  • Appl. No.:
    12/582863
  • Inventors:
    Guoxiao Guo - Foothill Ranch CA,
    Abhishek Dhanda - Mission Viejo CA,
    Jie Yu - Irvine CA,
  • Assignee:
    Western Digital Technologies, Inc. - Irvine CA
  • International Classification:
    G11B 5/596
  • US Classification:
    360 7708, 360 31
  • Abstract:
    A disk drive is disclosed comprising a head actuated over a disk, the disk including a plurality of servo sectors wherein each servo sector comprises at least one servo burst. A read signal emanating from the head is sampled while reading a servo burst in a servo sector to generate a plurality of sample values. A quality metric is generated in response to a plurality of sample values of a servo sub-burst representing part of the servo burst. When the quality metric does not exceed a threshold, the servo sub-burst sample values are excluded when generating a position error signal (PES) representing a position of the head over the disk. When the quality metric exceeds the threshold, the servo sub-burst sample values are included when generating the PES. The head is then positioned over the disk in response to the PES.

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ChandigarhAsst. Team Lead at Conjoinix Total Solutions Past: Web Designer at Conjoinix Total Solutions, Web Designer at Coefficient India

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