Inventor

WEERASOORIYA SIRI S

US45 patents

⚠️ This page may combine multiple inventors who share the name “WEERASOORIYA SIRI S”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

WEERASOORIYA SIRI S

WESTERN DIGITAL TECH INC

Servo writing a disk drive by integrating a spiral track read signal

Servo writing a disk drive from spiral tracks by shifting a demodulation window an integer number of sync mark intervals

Servo writing a disk drive by processing spiral tracks in an interleaved manner

Adjusting track density over disk radius by changing slope of spiral tracks used to servo write a disk drive

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

Disk drive detecting defective spiral servo track

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

Servo writing a disk drive using a secondary actuator to control skew angle

Servo writing a disk drive from a number of spiral tracks equal to a non-integer multiple of product servo wedges

Servo writing a disk drive by synchronizing a servo write clock to a reference pattern on the disk and compensating for repeatable phase error

Servo writing a disk drive by writing discontinuous spiral tracks to prevent overheating

Adjusting track density by changing PES algorithm when servo writing a disk drive from spiral tracks

Servo writing a disk drive by overwriting a harmonic frequency fill pattern in the servo burst area

Demodulating servo sectors and spiral tracks using common circuitry

Spiral slope approximation of spiral patterns written to a disk of a disk drive

Servoing on concentric servo sectors of a first disk surface to write a spiral servo track to a second disk surface

Disk drive self servo writing spiral tracks by propagating bursts

Disk drive adjusting estimated reader/writer offset to achieve target burst crossing signal amplitude when propagating servo sectors

Calibrating correlation between PES and off-track displacement by processing high frequency signal in spiral track

Adjusting track density by changing slope of spiral tracks used to servo write a disk drive

Method for reducing disk thermal expansion effects while writing reference spiral servo patterns to a disk of a disk drive

Disk drive comprising index spiral track identified by change in sync mark

Data storage device measuring reader/writer offset by reading spiral track and concentric servo sectors

Disk drive writing radial offset spiral servo tracks by reading spiral seed tracks

Data storage device reading first spiral track while simultaneously writing second spiral track

Data storage device attenuating interference from first spiral track when reading second spiral track

Disk drive adapting feed-forward compensation using iterative learning control over segments of seek length

Disk drive servoing on first disk surface while erasing second disk surface

Disk drive measuring spiral track error by measuring a slope of a spiral track across a disk radius

Disk drive performing spiral scan of disk surface to detect residual data

LIANG JIANGANG

Disk drive adjusting demodulation window for spiral track using timing feed-forward compensation

Disk drive estimating repeatable runout of reference pattern based on repeatable runout of phase error

Disk drive writing spiral tracks on a slave surface using repeatable runout compensation for a master surface

Disk drive compensating for track squeeze by writing non-circular servo tracks

RIGNEY BRIAN P

Disk drive performing in-drive spiral track writing

Disk drive centering demodulation windows on spiral tracks during a seek operation

Disk drive adjusting gain and offset of BEMF velocity sensor during self writing of spiral tracks

Disk drive calibrating a velocity profile prior to writing a spiral track

TOSHIBA KK

Split actuator drive that limits slew rate of aggressor VCM to reduce victim disturbances

Split actuator drive that limits slew rate of aggressor VCM to reduce victim disturbances

Disk drive that efficiently handles random mixed-R/W command-streams

Disk drive that efficiently handles random mixed-R/W command-streams

KANG SOO-CHOON

Disk drive detecting touchdown event by evaluating frequency response of a touchdown metric

Disk drive detecting when head is on ramp

SMITH STEVEN C

Disk drive employing overlapping servo zones to facilitate servo zone crossing