Inventor

NUMASATO HIDEHIKO

JP15 patents

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

WESTERN DIGITAL TECH INC

7 patents

US10410657B1Sep 10, 2019

Data storage device employing nominal and adaptive multi-actuator decoupler

WESTERN DIGITAL TECH INC9 citations84

US10930310B1Feb 23, 2021

Data storage device sorting access commands based on peak current for multiple actuators

WESTERN DIGITAL TECH INC8 citations83

US10839839B1Nov 17, 2020

Data storage device managing peak current for multiple actuators

WESTERN DIGITAL TECH INC9 citations83

US11915731B1Feb 27, 2024

Data storage device with notch filter calibration based on multi-rate excitation and error rejection

WESTERN DIGITAL TECH INC0 citations59

US11817122B1Nov 14, 2023

Data storage device with notch filter calibration based on multi-rate excitation and error rejection

WESTERN DIGITAL TECH INC1 citations59

US12271631B1Apr 8, 2025

Data storage device sorting access commands based on performance and off-track mitigation optimization

WESTERN DIGITAL TECH INC0 citations57

US12223982B1Feb 11, 2025

Head velocity derating for data storage devices including disk media

WESTERN DIGITAL TECH INC0 citations45

HITACHI LTD

5 patents

US6898039B2May 24, 2005

Positioning control device for two-stage actuator

HITACHI LTD22 citations92

US6407876B1Jun 18, 2002

Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head

HITACHI LTD37 citations92

US6335845B1Jan 1, 2002

Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head

HITACHI LTD19 citations92

US5986845ANov 16, 1999

Apparatus for positioning magnetic head and method of the same

HITACHI LTD20 citations83

US6707633B2Mar 16, 2004

Magnetic disk device including coarse and micro actuators

HITACHI LTD12 citations73

HITACHI GLOBAL STORAGE TECH

3 patents

US6888696B2May 3, 2005

NUMASATO HIDEHIKO

WESTERN DIGITAL TECH INC

Data storage device employing nominal and adaptive multi-actuator decoupler

Data storage device sorting access commands based on peak current for multiple actuators

Data storage device managing peak current for multiple actuators

Data storage device with notch filter calibration based on multi-rate excitation and error rejection

Data storage device with notch filter calibration based on multi-rate excitation and error rejection

Data storage device sorting access commands based on performance and off-track mitigation optimization

Head velocity derating for data storage devices including disk media

HITACHI LTD

Positioning control device for two-stage actuator

Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head

Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head

Apparatus for positioning magnetic head and method of the same

Magnetic disk device including coarse and micro actuators

HITACHI GLOBAL STORAGE TECH

Magnetic disk apparatus and servo signal recording method

Magnetic disk apparatus with dual stage actuator

Magnetic disk apparatus