Inventor · disambiguated record
Tetsuo Semba
Also filed as: SEMBA TETSUO
51 granted patents·2 pending applications·788 citations·filing 1992–2019
99Inventor score
Files withHITACHI GLOBAL STORAGE TECH21HGST Netherlands BV13IBM11WESTERN DIGITAL TECH INC3DHANDA ABHISHEK2
Top patents by PatentIndex Score
53 records- 0197US9286926B1Two-dimensional magnetic recording (TDMR) disk drive with varying servo track pitchHGST Netherlands BV·Filed 2015·Granted Mar 15, 2016·29 cites·15 claims
- 0295US7486470B1Hard disk drive vibration cancellation using adaptive filterHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Feb 3, 2009·21 cites·20 claims
- 0395US7145746B1Disk drive with adaptive control of periodic disturbancesHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Dec 5, 2006·23 cites·13 claims
- 0495US7079339B1Dual-stage actuator disk drive with method for secondary-actuator failure detection and recovery using a relative-position sensor while track followingHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Jul 18, 2006·22 cites·16 claims
- 0594US9792938B1Data storage device communicating servo information between servo channels of multiple actuatorsWESTERN DIGITAL TECH INC·Filed 2017·Granted Oct 17, 2017·19 cites·18 claims
- 0694US8842507B1Heat-assisted magnetic recording disk drive (HAMR) with thermal sensor and laser power predictionHGST Netherlands BV·Filed 2013·Granted Sep 23, 2014·25 cites·16 claims
- 0794US7177113B1Magnetic recording disk drive with switchable rotational vibration cancellationHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Feb 13, 2007·26 cites·12 claims
- 0894US7133229B2Magnetic recording disk drive with patterned media and compensation for write-clock timing error caused by rotational disturbancesHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Nov 7, 2006·31 cites·13 claims
- 0994US7079338B1Dual-stage actuator disk drive with method for secondary-actuator failure detection and recovery while track-followingHITACHI GLOBAL STORAGETECHNOLO·Filed 2005·Granted Jul 18, 2006·26 cites·22 claims
- 1093US9349400B1Magnetic recording disk drive with adjustable data track pitch and compensation for repeatable runout (RRO)HGST Netherlands BV·Filed 2015·Granted May 24, 2016·14 cites·16 claims
- 1192US8724248B2Method and apparatus for compensating vibration by adjusting track pitchDHANDA ABHISHEK·Filed 2011·Granted May 13, 2014·22 cites·18 claims
- 1292US7375916B2Magnetic recording disk drive with multiple feedforward controllers for rotational vibration cancellationHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted May 20, 2008·16 cites·22 claims
- 1392US7345841B2Disk drive using a disturbance sensor for disturbance frequency-identification and suppressionHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Mar 18, 2008·17 cites·10 claims
- 1492US6219196B1Method and apparatus for suppressing mechanical resonance in a disk drive storage device using a notch filterIBM·Filed 1998·Granted Apr 17, 2001·73 cites·21 claims
- 1591US7450335B2Reducing read/write head track misregistrationHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Nov 11, 2008·12 cites·20 claims
- 1691US6614613B1Phase technique for active damping in a servo-controlled actuatorIBM·Filed 2000·Granted Sep 2, 2003·32 cites·26 claims
- 1791US5504726AMethod and apparatus for calibrating focus and tracking error signals in an optical drive with measuring offsets during track jumpsIBM·Filed 1994·Granted Apr 2, 1996·51 cites·14 claims
- 1890US10410657B1Data storage device employing nominal and adaptive multi-actuator decouplerWESTERN DIGITAL TECH INC·Filed 2019·Granted Sep 10, 2019·9 cites·11 claims
- 1990US7457076B2Head seek control method suppressing vibrations and rotatary recorder/reproducerHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Nov 25, 2008·10 cites·16 claims
- 2090US7012777B1Disk drive with capacitance sensing of disk vibration and feedforward control for removal of read/write head track misregistrationHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Mar 14, 2006·28 cites·18 claims
- 2189US7035034B2Data storage device, control device, off-track control method, and control methodIBM·Filed 2003·Granted Apr 25, 2006·26 cites·30 claims
- 2288US7486469B1Minimizing a mechanical mode excitation utilizing a generated seek trajectoryHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Feb 3, 2009·8 cites·20 claims
- 2388US7450339B2Disk drive with support structure for damping plates and disk-vibration capacitive sensorsHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Nov 11, 2008·6 cites·3 claims
- 2488US7206162B2Seek trajectory generation using adaptive filteringHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Apr 17, 2007·24 cites·29 claims
- 2588US6831809B2Rotary recording apparatus and method of controlling the apparatusIBM·Filed 2002·Granted Dec 14, 2004·26 cites·19 claims
- 2687US9934803B1Data storage device attenuating multiple actuator coupling disturbanceWESTERN DIGITAL TECH INC·Filed 2017·Granted Apr 3, 2018·8 cites·24 claims
- 2786US8625231B1Adjusting VGA analog gain for misaligned servo sectors in a disk driveHGST Netherlands BV·Filed 2012·Granted Jan 7, 2014·8 cites·17 claims
- 2886US7277258B2Dual-stage actuator disk drive with optimal location of the movable portion of the secondary actuatorHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Oct 2, 2007·7 cites·19 claims
- 2985US7826170B2Apparatus and method for adjusting a feed-forward signal for seek control during a seek operationHITACHI GLOBAL STORAGE TECH·Filed 2008·Granted Nov 2, 2010·6 cites·11 claims
- 3084US7580217B2Disk drive with hybrid analog-digital acceleration feedforward control system and method for rejecting rotational vibrationHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Aug 25, 2009·9 cites·17 claims
- 3183US7268968B2Vibration suppression for servo controlHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Sep 11, 2007·18 cites·26 claims
- 3282US8737002B1Magnetic recording disk with patterned nondata islands with different sizes and opposite polarity and method for making the diskHGST Netherlands BV·Filed 2013·Granted May 27, 2014·5 cites·22 claims
- 3382US8379342B2Magnetic recording disk drive with rotational vibration compensation having adaptive optimization of vibration sensor gainsHGST Netherlands BV·Filed 2008·Granted Feb 19, 2013·5 cites·12 claims
- 3476US8817405B1Magnetic recording disk drive with frequency adjustment for misaligned servo patternsHGST Netherlands BV·Filed 2013·Granted Aug 26, 2014·3 cites·15 claims
- 3574US8699165B2Thermal read/write offset compensationHUANG LIDU·Filed 2010·Granted Apr 15, 2014·3 cites·15 claims
- 3674US7292407B2Disk drive with support structure for disk-vibration capacitive sensorsHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Nov 6, 2007·7 cites·2 claims
- 3774US5760991ADisk storage unit positioning control for applying DC offsets to a tracking errorIBM·Filed 1994·Granted Jun 2, 1998·22 cites·2 claims
- 3873US9412403B1Magnetic recording disk drive with position error signal (PES) blocks in the data tracks for compensation of track misregistrationHGST Netherlands BV·Filed 2015·Granted Aug 9, 2016·3 cites·13 claims
- 3971US8953266B2Method and structure for improving performance and storage density in a data storage deviceDHANDA ABHISHEK·Filed 2012·Granted Feb 10, 2015·2 cites·27 claims
- 4071US7499243B2Disk drive with support structure for air dams and disk-vibration capacitive sensorsHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Mar 3, 2009·1 cites·1 claims
- 4171US5323368ATrack crossing apparatus and method using the difference between pick-up velocity and a predetermined velocityIBM·Filed 1992·Granted Jun 21, 1994·19 cites·6 claims
- 4270US8665549B2Method for creating burst magnitude servo patterns with unipolar bits on a magnetic media of a magnetic data recording systemALBRECHT THOMAS R·Filed 2011·Granted Mar 4, 2014·2 cites·16 claims
- 4368US7010653B2Data storage device, command queue re-ordering method, and data processing method and programHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Mar 7, 2006·18 cites·12 claims
- 4467US5317550AApparatus and method for track accessIBM·Filed 1993·Granted May 31, 1994·17 cites·9 claims
- 4566US9025263B2Write current and fly height adjustment for compensating media coercivity variationHGST Netherlands BV·Filed 2013·Granted May 5, 2015·2 cites·19 claims
- 4666US5768228AMethod and sytem for cancelling optical servo crosstalk in optical disk drivesIBM·Filed 1996·Granted Jun 16, 1998·18 cites·10 claims
- 4759US7126784B2Concurrent data recording and reproducing method, seek operation control method and magnetic disk drive using the methodsHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Oct 24, 2006·3 cites·17 claims
- 4848US5936919ASystem for compensating for hard sector noise degradation of tracking error signals in an optical data storage systemIBM·Filed 1997·Granted Aug 10, 1999·6 cites·16 claims
- 4945US8363348B2Patterned media with structured PES servo segments encoding local track positionHGST Netherlands BV·Filed 2010·Granted Jan 29, 2013·0 cites·20 claims
- 5045US2014320995A1Implementing data frequency and data bits per sector (bps) calibration for non-circular disk tracksHGST Netherlands BV·Filed 2013·Application pending·0 cites
Showing the top 50 of 53 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →