Inventor · disambiguated record
Hanan Kupferman
Also filed as: KUPFERMAN HANAN
26 granted patents·3,547 citations·filing 1992–2008
98Inventor score
Top patents by PatentIndex Score
26 records- 0199US7619841B1Disk drive subtracting low frequency disturbance from a servo burst signalWESTERN DIGITAL TECH INC·Filed 2005·Granted Nov 17, 2009·138 cites·12 claims
- 0299US7551383B1Adjusting voltage delivered to disk drive circuitry based on a selected zoneWESTERN DIGITAL TECH INC·Filed 2006·Granted Jun 23, 2009·150 cites·29 claims
- 0399US7075746B1Disk drives and disk drive containing devices that include a servo frequency generator and spindle control timer that compensate for disk eccentricityWESTERN DIGITAL TECH INC·Filed 2005·Granted Jul 11, 2006·139 cites·9 claims
- 0498US7715138B1Disk drive estimating a servo zone after synchronously detecting a servo sync markWESTERN DIGITAL TECH INC·Filed 2007·Granted May 11, 2010·125 cites·19 claims
- 0598US7372650B1Rotating media storage device having a calibration track with unique calibration servo synch marksWESTERN DIGITAL TECH INC·Filed 2004·Granted May 13, 2008·142 cites·26 claims
- 0698US7333290B1Magnetic disk in a disk drive and method having improved null servo burst phasingWESTERN DIGITAL TECH INC·Filed 2006·Granted Feb 19, 2008·122 cites·15 claims
- 0798US7116505B1Reducing the length of servo-wedges in a disk driveWESTERN DIGITAL TECH INC·Filed 2003·Granted Oct 3, 2006·113 cites·41 claims
- 0898US7057836B1Disk drive servo controller utilizing an extended servo headerWESTERN DIGITAL TECH INC·Filed 2004·Granted Jun 6, 2006·146 cites·12 claims
- 0998US7046465B1Disk drive having one or more partial servo wedges that includes a short servo sync mark that is different than the servo sync word of full servo wedgesWESTERN DIGITAL TECH INC·Filed 2004·Granted May 16, 2006·155 cites·17 claims
- 1098US7027257B1Disk drive having a disk including a servo burst pattern in which a phase difference between radially adjacent servo bursts is less than 180 degreesWESTERN DIGITAL TECH INC·Filed 2004·Granted Apr 11, 2006·127 cites·18 claims
- 1198US7023639B1Servo synchronization validation techniques based on both servo synch marks and wedge identifiers in a rotating media storage deviceWESTERN DIGITAL TECH INC·Filed 2004·Granted Apr 4, 2006·133 cites·23 claims
- 1298US7023637B1Disk drive having a disk including a servo burst pattern that improves the signal to noise ratio during track following for writingWESTERN DIGITAL TECH INC·Filed 2004·Granted Apr 4, 2006·116 cites·3 claims
- 1398US6980389B1Disk drive having a disk including a servo burst pattern having a normal servo burst field and a quadrature servo burst fieldWESTERN DIGITAL TECH INC·Filed 2004·Granted Dec 27, 2005·113 cites·21 claims
- 1498US6934104B1Servo synchronization based on a servo synch mark that conflicts with self-clocking encoding algorithmsWESTERN DIGITAL TECH INC·Filed 2004·Granted Aug 23, 2005·132 cites·28 claims
- 1598US6882486B1Disk drive comprising asynchronous/synchronous gain control for fault tolerant detection of servo sync mark after head switchWESTERN DIGITAL TECH INC·Filed 2002·Granted Apr 19, 2005·148 cites·14 claims
- 1698US6687073B1Method of simultaneously writing servo tracks on a hard disk driveWESTERN DIGITAL TECH INC·Filed 2001·Granted Feb 3, 2004·156 cites·15 claims
- 1798US6657810B1Disk drive employing separate read and write repeatable runout estimated values for a head having a read element offset from a write elementWESTERN DIGITAL TECH INC·Filed 2001·Granted Dec 2, 2003·182 cites·4 claims
- 1898US6545835B1Method and apparatus for RRO learning before and after shipping to cancel RRO in a disk driveWESTERN DIGITAL TECH INC·Filed 2000·Granted Apr 8, 2003·146 cites·30 claims
- 1998US6480349B1Disk drive employing a non-volatile semiconductor memory for storing read channel parameter calibrated for the disk drive used to recover disk channel parameterWESTERN DIGITAL TECH INC·Filed 2000·Granted Nov 12, 2002·174 cites·9 claims
- 2097US7215496B1Disk drive having adaptively-sized sectors to compensate for disk eccentricityWESTERN DIGITAL TECH INC·Filed 2004·Granted May 8, 2007·139 cites·9 claims
- 2197US6525892B1Method of calibrating a write current-setting for servo writing a disk driveWESTERN DIGITAL TECH INC·Filed 2000·Granted Feb 25, 2003·164 cites·4 claims
- 2297US6493173B1Headerless disk drive comprising repeatable runout (RRO) correction values recorded at a user data rateWESTERN DIGITAL TECH INC·Filed 1999·Granted Dec 10, 2002·189 cites·10 claims
- 2396US8116023B1Disk drive comprising preamble aligned zoned servo sectorsKUPFERMAN HANAN·Filed 2008·Granted Feb 14, 2012·118 cites·8 claims
- 2495US7440214B1Disk drive and method having cost-effective storage of the disk drive's internal program codeWESTERN DIGITAL TECH INC·Filed 2003·Granted Oct 21, 2008·131 cites·13 claims
- 2586US5940240AConstant velocity servo linearity calibration method for MR headWESTERN DIGITAL CORP·Filed 1997·Granted Aug 17, 1999·49 cites·6 claims
- 2680US5412809ADisk drive power control circuit and methodMITSUMI ELECTRIC CO LTD·Filed 1992·Granted May 2, 1995·100 cites·11 claims
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