Weerasooriya; Siri S.

Patent Applications and Registrations

Patent applications and USPTO patent grants for Weerasooriya; Siri S..The latest application filed is for "disk drive that efficiently handles random mixed-r/w command-streams".

Company Profile

1.54.4

Weerasooriya; Siri S. - Campbell CA

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Disk drive that efficiently handles random mixed-R/W command-streams Grant 10,678,442 - Hara , et al.	2020-06-09
Disk Drive That Efficiently Handles Random Mixed-r/w Command-streams App 20190163368 - HARA; Takeyori ; et al.	2019-05-30
Disk drive that efficiently handles random mixed-R/W command-streams Grant 10,198,188 - Hara , et al. Fe	2019-02-05
Disk Drive That Efficiently Handles Random Mixed-r/w Command-streams App 20180260115 - HARA; Takeyori ; et al.	2018-09-13
Data storage device measuring reader/writer offset by reading spiral track and concentric servo sectors Grant 9,245,560 - Nie , et al. January 26, 2	2016-01-26
Data storage device attenuating interference from first spiral track when reading second spiral track Grant 9,208,810 - Nie , et al. December 8, 2	2015-12-08
Disk drive writing radial offset spiral servo tracks by reading spiral seed tracks Grant 9,076,490 - Nie , et al. July 7, 2	2015-07-07
Disk drive measuring spiral track error by measuring a slope of a spiral track across a disk radius Grant 9,047,901 - Nie , et al. June 2, 2	2015-06-02
Data storage device reading first spiral track while simultaneously writing second spiral track Grant 8,982,490 - Park , et al. March 17, 2	2015-03-17
Disk drive calibrating a velocity profile prior to writing a spiral track Grant 8,917,474 - Rigney , et al. December 23, 2	2014-12-23
Disk drive adapting feed-forward compensation using iterative learning control over segments of seek length Grant 8,902,535 - Nie , et al. December 2, 2	2014-12-02
Disk drive performing spiral scan of disk surface to detect residual data Grant 8,896,957 - Ng , et al. November 25, 2	2014-11-25
Disk drive servoing on first disk surface while erasing second disk surface Grant 8,861,123 - Ooi Huat Lye , et al. October 14, 2	2014-10-14
Disk drive detecting when head is on ramp Grant 8,786,976 - Kang , et al. July 22, 2	2014-07-22
Disk drive compensating for track squeeze by writing non-circular servo tracks Grant 8,749,904 - Liang , et al. June 10, 2	2014-06-10
Disk drive employing overlapping servo zones to facilitate servo zone crossing Grant 8,724,245 - Smith , et al. May 13, 2	2014-05-13
Disk drive adjusting demodulation window for spiral track using timing feed-forward compensation Grant 8,724,253 - Liang , et al. May 13, 2	2014-05-13
Disk drive detecting touchdown event by evaluating frequency response of a touchdown metric Grant 8,699,173 - Kang , et al. April 15, 2	2014-04-15
Disk drive estimating repeatable runout of reference pattern based on repeatable runout of phase error Grant 8,670,206 - Liang , et al. March 11, 2	2014-03-11
Disk drive adjusting gain and offset of BEMF velocity sensor during self writing of spiral tracks Grant 8,665,551 - Rigney , et al. March 4, 2	2014-03-04
Disk drive performing in-drive spiral track writing Grant 8,634,283 - Rigney , et al. January 21, 2	2014-01-21
Disk drive writing spiral tracks on a slave surface using repeatable runout compensation for a master surface Grant 8,537,486 - Liang , et al. September 17, 2	2013-09-17
Disk drive centering demodulation windows on spiral tracks during a seek operation Grant 8,451,697 - Rigney , et al. May 28, 2	2013-05-28
Disk Drive Writing Spiral Tracks On A Slave Surface Using Repeatable Runout Compensation For A Master Surface App 20130038959 - LIANG; JIANGANG ; et al.	2013-02-14
Spiral slope approximation of spiral patterns written to a disk of a disk drive Grant 7,852,592 - Liang , et al. December 14, 2	2010-12-14
Servoing on concentric servo sectors of a first disk surface to write a spiral servo track to a second disk surface Grant 7,843,662 - Weerasooriya , et al. November 30, 2	2010-11-30
Disk drive comprising index spiral track identified by change in sync mark Grant 7,839,591 - Weerasooriya , et al. November 23, 2	2010-11-23
Disk drive detecting defective spiral servo track Grant 7,746,592 - Liang , et al. June 29, 2	2010-06-29
Disk drive self servo writing spiral tracks by propagating bursts Grant 7,688,539 - Bryant , et al. March 30, 2	2010-03-30
Disk drive demodulating a spiral track by finding a maximum correlation between a spiral track crossing signal and a time-shifted nominal spiral track crossing signal Grant 7,656,604 - Liang , et al. February 2, 2	2010-02-02
Disk drive adjusting estimated reader/writer offset to achieve target burst crossing signal amplitude when propagating servo sectors Grant 7,602,575 - Lifchits , et al. October 13, 2	2009-10-13
Calibrating correlation between PES and off-track displacement by processing high frequency signal in spiral track Grant 7,499,236 - Lee , et al. March 3, 2	2009-03-03
Servo writing a disk drive using a secondary actuator to control skew angle Grant 7,489,464 - McNab , et al. February 10, 2	2009-02-10
Servo writing a disk drive from a number of spiral tracks equal to a non-integer multiple of product servo wedges Grant 7,468,855 - Weerasooriya , et al. December 23, 2	2008-12-23
Adjusting track density by changing slope of spiral tracks used to servo write a disk drive Grant 7,433,143 - Ying , et al. October 7, 2	2008-10-07
Servo writing a disk drive by synchronizing a servo write clock to a reference pattern on the disk and compensating for repeatable phase error Grant 7,333,280 - Lifchits , et al. February 19, 2	2008-02-19
Servo writing a disk drive by writing discontinuous spiral tracks to prevent overheating Grant 7,330,327 - Chue , et al. February 12, 2	2008-02-12
Servo writing a disk drive by integrating a spiral track read signal Grant 7,301,717 - Lee , et al. November 27, 2	2007-11-27
Servo writing a disk drive from spiral tracks by shifting a demodulation window an integer number of sync mark intervals Grant 7,248,426 - Weerasooriya , et al. July 24, 2	2007-07-24
Servo writing a disk drive by processing spiral tracks in an interleaved manner Grant 7,113,362 - Lee , et al. September 26, 2	2006-09-26
Adjusting track density by changing PES algorithm when servo writing a disk drive from spiral tracks Grant 7,068,459 - Cloke , et al. June 27, 2	2006-06-27
Servo writing a disk drive by overwriting a harmonic frequency fill pattern in the servo burst area Grant 7,068,461 - Chue , et al. June 27, 2	2006-06-27
Method for reducing disk thermal expansion effects while writing reference spiral servo patterns to a disk of a disk drive Grant 6,992,852 - Ying , et al. January 31, 2	2006-01-31
Demodulating servo sectors and spiral tracks using common circuitry Grant 6,989,954 - Lee , et al. January 24, 2	2006-01-24
Adjusting track density over disk radius by changing slope of spiral tracks used to servo write a disk drive Grant 6,987,636 - Chue , et al. January 17, 2	2006-01-17
Using an external spiral servo writer to write reference servo sectors and spiral tracks to a disk to facilitate writing product servo sectors to the disk Grant 6,965,489 - Lee , et al. November 15, 2	2005-11-15

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