Inventor
JI CHUANWEN
US22 patents
⚠️ This page may combine multiple inventors who share the name “JI CHUANWEN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
WESTERN DIGITAL TECH INC
18 patentsUS6954324B1Oct 11, 2005
Disk drive disabling BEMF detection window to reduce acoustic noise while using wedge spindle speed control
WESTERN DIGITAL TECH INC124 citations98
US6914740B1Jul 5, 2005
Disk drive employing BEMF spindle speed control or wedge spindle speed control
WESTERN DIGITAL TECH INC120 citations98
US7660067B1Feb 9, 2010
Disk drive initializing a coil temperature estimation algorithm using a resistance of the coil estimated during a load operation
WESTERN DIGITAL TECH INC112 citations97
US7253582B1Aug 7, 2007
Disk drive estimating angular position of spindle motor during spin-up by computing differences in winding current rise times
WESTERN DIGITAL TECH INC114 citations97
US7068463B1Jun 27, 2006
Disk drive employing a velocity profile and back EMF feedback to control a voice coil motor
WESTERN DIGITAL TECH INC119 citations97
US8797664B1Aug 5, 2014
Polarity detection of piezoelectric actuator in disk drive
WESTERN DIGITAL TECH INC77 citations96
US8804267B2Aug 12, 2014
Disk drive predicting spindle motor failure by evaluating current draw relative to temperature
WESTERN DIGITAL TECH INC77 citations95
US8605384B1Dec 10, 2013
Disk drive performing lifetime logging of microactuator sensitivity
WESTERN DIGITAL TECH INC110 citations95
US8913338B1Dec 16, 2014
Disk drive reducing write unsafe threshold when detecting an unrecoverable servo compensation value
WESTERN DIGITAL TECH INC5 citations73
US10629234B1Apr 21, 2020
Data storage device computing notch filters for multiple temperatures
WESTERN DIGITAL TECH INC3 citations72
US9355666B1May 31, 2016
Disk drive measuring stroke difference between heads by detecting a difference between ramp contact
WESTERN DIGITAL TECH INC2 citations63
US8922931B1Dec 30, 2014
Disk drive releasing variable amount of buffered write data based on sliding window of predicted servo quality
WESTERN DIGITAL TECH INC2 citations63
US8929022B1Jan 6, 2015
Disk drive detecting microactuator degradation by evaluating frequency component of servo signal
WESTERN DIGITAL TECH INC2 citations62
US11790949B2Oct 17, 2023
Data storage device integrating wedge repeatable runout (WRRO) learning into data recovery procedure (DRP)
WESTERN DIGITAL TECH INC1 citations59
US11482253B1Oct 25, 2022
Per head, per profile finalize to move repeatable runout compensation values to NAND memory
WESTERN DIGITAL TECH INC1 citations58
US11456014B1Sep 27, 2022
Repeatable runout compensation value generation
WESTERN DIGITAL TECH INC0 citations58
US9286927B1Mar 15, 2016
Data storage device demodulating servo burst by computing slope of intermediate integration points
WESTERN DIGITAL TECH INC1 citations52
US9349401B1May 24, 2016
Electronic system with media scan mechanism and method of operation thereof
WESTERN DIGITAL TECH INC0 citations48