Inventor

SEMBA TETSUO

US51 patents

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

SEMBA TETSUO

HITACHI GLOBAL STORAGE TECH

Hard disk drive vibration cancellation using adaptive filter

Seek trajectory generation using adaptive filtering

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

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

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

Magnetic recording disk drive with switchable rotational vibration cancellation

Minimizing a mechanical mode excitation utilizing a generated seek trajectory

Head seek control method suppressing vibrations and rotatary recorder/reproducer

Reducing read/write head track misregistration

Vibration suppression for servo control

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

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

Data storage device, command queue re-ordering method, and data processing method and program

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

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

Disk drive with support structure for disk-vibration capacitive sensors

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

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

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

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

HGST Netherlands BV

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

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

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

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

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

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

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

Magnetic recording disk drive with frequency adjustment for misaligned servo patterns

Write current and fly height adjustment for compensating media coercivity variation

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

Patterned media with structured PES servo segments encoding local track position

IBM

Method and apparatus for suppressing mechanical resonance in a disk drive storage device using a notch filter

Disk storage unit positioning control for applying DC offsets to a tracking error

Method and apparatus for calibrating focus and tracking error signals in an optical drive with measuring offsets during track jumps

Data storage device, control device, off-track control method, and control method

Rotary recording apparatus and method of controlling the apparatus

Phase technique for active damping in a servo-controlled actuator

Method and sytem for cancelling optical servo crosstalk in optical disk drives

Track crossing apparatus and method using the difference between pick-up velocity and a predetermined velocity

Apparatus and method for track access

System for compensating for hard sector noise degradation of tracking error signals in an optical data storage system

WESTERN DIGITAL TECH INC

Data storage device employing nominal and adaptive multi-actuator decoupler

Data storage device attenuating multiple actuator coupling disturbance

Data storage device communicating servo information between servo channels of multiple actuators

DHANDA ABHISHEK

Method and apparatus for compensating vibration by adjusting track pitch

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

HITACHI GLOBAL STORAGETECHNOLO

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

HUANG LIDU

Thermal read/write offset compensation

ALBRECHT THOMAS R

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