Patents by Inventor Yap Han Ng

Yap Han Ng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Disk drive performing spiral scan of disk surface to detect residual data
    Patent number: 8896957
    Abstract: A disk drive is disclosed comprising a disk surface comprising a radius, a head operable to generate a read signal, and a voice coil motor (VCM) operable to actuate the head over the disk surface. A back electromotive force (BEMF) voltage generated by the VCM is measured. The VCM is controlled to move the head over substantially the entire radius of the disk surface in response to the BEMF voltage, and while moving the head the read signal from the head is processed to detect residual data recorded on the disk surface after erasing the disk surface.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: November 25, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Yap Han Ng, Charles A. Park, Songwut Jomthaisong, Siri S. Weerasooriya, Brian P. Rigney