Issued Patents All Time
Showing 1–25 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12211529 | Fast characterization of media-noise-induced repeatable runout | Richard M. Ehrlich | 2025-01-28 |
| 11942123 | Measuring VCM radial location using flex circuit shape during spiral write | Gary W. Calfee, Rodney Ngai | 2024-03-26 |
| 11942122 | Determining absolute position on HDD spiral patterns using dual TDMR readers | Gary W. Calfee, Jiangang Liang | 2024-03-26 |
| 11776570 | Reducing non-coherent repeatable runout in two-dimensional magnetic recording disk drives | — | 2023-10-03 |
| 11688423 | Split-actuator disk drive that uses microactuator feedforward to reduce effects of cross-actuator coupling | Gary W. Calfee, Richard M. Ehrlich, Thorsten Schmidt | 2023-06-27 |
| 11568894 | Reducing the effect of spiral sync marks in non-coherent repeatable runout | — | 2023-01-31 |
| 11508403 | Reducing the effect of actuator cross-coupling in split actuator drives | Anton Gerasimov, Jiangang Liang, Gary W. Calfee | 2022-11-22 |
| 11227631 | Parallel micro-actuator SSW writing | Thorsten Schmidt, Gary W. Calfee, Hieu T. Pham | 2022-01-18 |
| 11205450 | Split-actuator disk drive that uses microactuator feedforward to reduce effects of cross-actuator coupling | Gary W. Calfee, Richard M. Ehrlich, Thorsten Schmidt | 2021-12-21 |
| 11189310 | Split-actuator disk drive that uses microactuator feedforward to reduce effects of cross-actuator coupling | Gary W. Calfee, Richard M. Ehrlich, Thorsten Schmidt | 2021-11-30 |
| 10665257 | Parallel micro-actuator SSW writing | Thorsten Schmidt, Gary W. Calfee, Hieu T. Pham | 2020-05-26 |
| 9953672 | Accurate repeatable runout compensation in disk drives during seeks | Jiangang Liang | 2018-04-24 |
| 9947356 | Calibration spiral to improve guide spiral placement | Richard Oswald, Li Zhang | 2018-04-17 |
| 9824708 | Spiral write launch while servoing on reference guide spirals | Jiangang Liang, Tony Huang, Gary W. Calfee | 2017-11-21 |
| 9691421 | Writing spirals with accurate slope on a disk drive media | Jiangang Liang, Li Zhang, Gary W. Calfee | 2017-06-27 |
| 9640210 | Virtual window mode for guide spiral servo demodulation | Jiangang Liang | 2017-05-02 |
| 9633682 | Accurate spiral gate positioning in the presence of large non-repeatable runout | Jiangang Liang | 2017-04-25 |
| 9514774 | Spiral pitch correction based on micro-jog variation | Jiangang Liang, Anton Gerasimov | 2016-12-06 |
| 9311941 | Erase coarse guide spiral-based in-drive erase process | Jiangang Liang, Ting-Chun Janet Liu, Gary W. Calfee | 2016-04-12 |
| 8879194 | Calibration of ramp location in a disk drive employing spiral-based self servo writing | — | 2014-11-04 |
| 8649117 | Method of writing a preamble field on a disk drive to reduce track squeeze | — | 2014-02-11 |
| 8416648 | System and method for forming a servo pattern on a media master | Koichi Wago, Neil Deeman | 2013-04-09 |
| 8054574 | Method of measuring non-coherent runout for a disk drive | — | 2011-11-08 |
| 7880987 | Media servowriter/certifier | Ken L. Belmont, Dan R. McLeran, Dave Scott Williamson, Mark Christian Roberts | 2011-02-01 |
| 7768736 | Certifying while servowriting media | Ken L. Belmont, Dan R. McLeran, Dave Scott Williamson, Mark Christian Roberts | 2010-08-03 |