Inventor
SHEH EDGAR D
US21 patents
⚠️ This page may combine multiple inventors who share the name “SHEH EDGAR D”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
WESTERN DIGITAL TECH INC
14 patentsUS7457071B1Nov 25, 2008
Locating an initial servo track in order to servo write a disk drive from spiral tracks
WESTERN DIGITAL TECH INC116 citations98
US7391583B1Jun 24, 2008
Fault tolerant sync mark detection while servo writing a disk drive from spiral tracks
WESTERN DIGITAL TECH INC129 citations98
US7068459B1Jun 27, 2006
Adjusting track density by changing PES algorithm when servo writing a disk drive from spiral tracks
WESTERN DIGITAL TECH INC175 citations98
US7391584B1Jun 24, 2008
Compensating for repeatable phase error when servo writing a disk drive from spiral tracks
WESTERN DIGITAL TECH INC138 citations97
US6693764B1Feb 17, 2004
Method and disk drive for improving head position accuracy during track following through real-time identification of external vibration
WESTERN DIGITAL TECH INC135 citations97
US6614618B1Sep 2, 2003
Disk drive with feed-forward control path that receives a reference position signal to apply a feed-forward command effort at a rate greater than a servo sampling rate
WESTERN DIGITAL TECH INC124 citations97
US9064537B1Jun 23, 2015
Disk drive measuring radial offset between heads by detecting a difference between ramp contact
WESTERN DIGITAL TECH INC25 citations92
US9076490B1Jul 7, 2015
Disk drive writing radial offset spiral servo tracks by reading spiral seed tracks
WESTERN DIGITAL TECH INC7 citations83
US8982490B1Mar 17, 2015
Data storage device reading first spiral track while simultaneously writing second spiral track
WESTERN DIGITAL TECH INC4 citations73
US8902535B1Dec 2, 2014
Disk drive adapting feed-forward compensation using iterative learning control over segments of seek length
WESTERN DIGITAL TECH INC5 citations72
US8861126B1Oct 14, 2014
Disk drive detecting when head is on ramp
WESTERN DIGITAL TECH INC3 citations62
US10923146B1Feb 16, 2021
Data storage device employing triangle-like dither to spread track squeeze
WESTERN DIGITAL TECH INC1 citations58
US9053727B1Jun 9, 2015
Disk drive opening spiral crossing window based on DC and AC spiral track error
WESTERN DIGITAL TECH INC0 citations51
US9047901B1Jun 2, 2015
Disk drive measuring spiral track error by measuring a slope of a spiral track across a disk radius
WESTERN DIGITAL TECH INC1 citations51
RIGNEY BRIAN P
4 patentsUS8634154B1Jan 21, 2014
Disk drive writing a sync mark seam in a bootstrap spiral track
RIGNEY BRIAN P113 citations97
US8634283B1Jan 21, 2014
Disk drive performing in-drive spiral track writing
RIGNEY BRIAN P116 citations97
US8665551B1Mar 4, 2014
Disk drive adjusting gain and offset of BEMF velocity sensor during self writing of spiral tracks
RIGNEY BRIAN P108 citations96
US8917474B1Dec 23, 2014
Disk drive calibrating a velocity profile prior to writing a spiral track
RIGNEY BRIAN P1 citations52