Inventor · disambiguated record
Chuanwen Ji
Also filed as: JI CHUANWEN
22 granted patents·1,033 citations·filing 2003–2022
96Inventor score
Technology areasG11B
Top patents by PatentIndex Score
22 records- 0198US8605384B1Disk drive performing lifetime logging of microactuator sensitivityWESTERN DIGITAL TECH INC·Filed 2012·Granted Dec 10, 2013·110 cites·24 claims
- 0297US7660067B1Disk drive initializing a coil temperature estimation algorithm using a resistance of the coil estimated during a load operationWESTERN DIGITAL TECH INC·Filed 2007·Granted Feb 9, 2010·112 cites·19 claims
- 0397US6954324B1Disk drive disabling BEMF detection window to reduce acoustic noise while using wedge spindle speed controlWESTERN DIGITAL TECH INC·Filed 2003·Granted Oct 11, 2005·124 cites·17 claims
- 0497US6914740B1Disk drive employing BEMF spindle speed control or wedge spindle speed controlWESTERN DIGITAL TECH INC·Filed 2003·Granted Jul 5, 2005·120 cites·30 claims
- 0596US7253582B1Disk drive estimating angular position of spindle motor during spin-up by computing differences in winding current rise timesWESTERN DIGITAL TECH INC·Filed 2004·Granted Aug 7, 2007·114 cites·18 claims
- 0696US7068463B1Disk drive employing a velocity profile and back EMF feedback to control a voice coil motorWESTERN DIGITAL TECH INC·Filed 2004·Granted Jun 27, 2006·119 cites·22 claims
- 0795US8797664B1Polarity detection of piezoelectric actuator in disk driveWESTERN DIGITAL TECH INC·Filed 2012·Granted Aug 5, 2014·77 cites·20 claims
- 0894US8804267B2Disk drive predicting spindle motor failure by evaluating current draw relative to temperatureWESTERN DIGITAL TECH INC·Filed 2012·Granted Aug 12, 2014·77 cites·16 claims
- 0994US8553351B1Disk drive correcting track ID in response to an estimated radial location and a burst PESNARAYANA ASWARTHA·Filed 2011·Granted Oct 8, 2013·107 cites·8 claims
- 1094US8335049B1Disk drive detecting crack in microactuatorLIU YANNING·Filed 2010·Granted Dec 18, 2012·44 cites·24 claims
- 1185US8922937B1Disk drive evaluating multiple vibration sensor outputs to enable write-protectionCHAHWAN ALAIN·Filed 2012·Granted Dec 30, 2014·8 cites·22 claims
- 1280US8913338B1Disk drive reducing write unsafe threshold when detecting an unrecoverable servo compensation valueWESTERN DIGITAL TECH INC·Filed 2013·Granted Dec 16, 2014·5 cites·22 claims
- 1377US11790949B2Data storage device integrating wedge repeatable runout (WRRO) learning into data recovery procedure (DRP)WESTERN DIGITAL TECH INC·Filed 2022·Granted Oct 17, 2023·1 cites·18 claims
- 1477US10629234B1Data storage device computing notch filters for multiple temperaturesWESTERN DIGITAL TECH INC·Filed 2019·Granted Apr 21, 2020·3 cites·17 claims
- 1577US9142235B1Disk drive characterizing microactuator by injecting sinusoidal disturbance and evaluating feed-forward compensation valuesBABINSKI ALEXANDER·Filed 2009·Granted Sep 22, 2015·4 cites·24 claims
- 1675US11482253B1Per head, per profile finalize to move repeatable runout compensation values to NAND memoryWESTERN DIGITAL TECH INC·Filed 2021·Granted Oct 25, 2022·1 cites·18 claims
- 1771US8929022B1Disk drive detecting microactuator degradation by evaluating frequency component of servo signalWESTERN DIGITAL TECH INC·Filed 2012·Granted Jan 6, 2015·2 cites·30 claims
- 1870US8922931B1Disk drive releasing variable amount of buffered write data based on sliding window of predicted servo qualityWESTERN DIGITAL TECH INC·Filed 2013·Granted Dec 30, 2014·2 cites·24 claims
- 1968US9355666B1Disk drive measuring stroke difference between heads by detecting a difference between ramp contactWESTERN DIGITAL TECH INC·Filed 2015·Granted May 31, 2016·2 cites·26 claims
- 2064US9286927B1Data storage device demodulating servo burst by computing slope of intermediate integration pointsWESTERN DIGITAL TECH INC·Filed 2014·Granted Mar 15, 2016·1 cites·22 claims
- 2150US9349401B1Electronic system with media scan mechanism and method of operation thereofWESTERN DIGITAL TECH INC·Filed 2014·Granted May 24, 2016·0 cites·24 claims
- 2249US11456014B1Repeatable runout compensation value generationWESTERN DIGITAL TECH INC·Filed 2021·Granted Sep 27, 2022·0 cites·22 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →