Tetsuo Semba

Magnetic recording disk drive with position error signal (PES) blocks in the data tracks for compensation of track misregistration

Magnetic recording disk drive with adjustable data track pitch and compensation for repeatable runout (RRO)

Two-dimensional magnetic recording (TDMR) disk drive with varying servo track pitch

Method and structure for improving performance and storage density in a data storage device

Write current and fly height adjustment for compensating media coercivity variation

IMPLEMENTING DATA FREQUENCY AND DATA BITS PER SECTOR (BPS) CALIBRATION FOR NON-CIRCULAR DISK TRACKS

Heat-assisted magnetic recording disk drive (HAMR) with thermal sensor and laser power prediction

Magnetic recording disk drive with frequency adjustment for misaligned servo patterns

Disk Drive Write-Inhibit Control Using Adaptive PES Predictor

Magnetic recording disk with patterned nondata islands with different sizes and opposite polarity and method for making the disk

Method and structure for improving performance and storage density in a data storage device

Adjusting VGA analog gain for misaligned servo sectors in a disk drive

Method and apparatus for compensating vibration by adjusting track pitch

Method for creating burst magnitude servo patterns with unipolar bits on a magnetic media of a magnetic data recording system

Patterned media with structured PES servo segments encoding local track position

Thermal read/write offset compensation

Magnetic recording disk drive with rotational vibration compensation having adaptive optimization of vibration sensor gains

Apparatus and method for adjusting a feed-forward signal for seek control during a seek operation

Hard disk drive vibration cancellation using adaptive filter

Minimizing a mechanical mode excitation utilizing a generated seek trajectory

Disk drive with hybrid analog-digital acceleration feedforward control system and method for rejecting rotational vibration

Disk drive with support structure for air dams and disk-vibration capacitive sensors

Disk drive with support structure for damping plates and disk-vibration capacitive sensors

Reducing read/write head track misregistration

Magnetic recording disk drive with multiple feedforward controllers for rotational vibration cancellation

Disk drive using a disturbance sensor for disturbance frequency-identification and suppression

Magnetic recording disk drive with switchable rotational vibration cancellation

Dual-stage actuator disk drive with optimal location of the movable portion of the secondary actuator

Disk drive with adaptive control of periodic disturbances

Magnetic recording disk drive with patterned media and compensation for write-clock timing error caused by rotational disturbances

Head seek control method suppressing vibrations and rotatary recorder/reproducer

Dual-stage actuator disk drive with method for secondary-actuator failure detection and recovery using a relative-position sensor while track following

Dual-stage actuator disk drive with method for secondary-actuator failure detection and recovery while track-following

Seek trajectory generation using adaptive filtering

Vibration suppression for servo control

Disk drive with support structure for disk-vibration capacitive sensors

Disk drive with capacitance sensing of disk vibration and feedforward control for removal of read/write head track misregistration

Concurrent data recording and reproducing method, seek operation control method and magnetic disk drive using the methods