Inventor

KAGAMI NAOYUKI

JP48 patents

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

KAGAMI NAOYUKI

IBM

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

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 system for performing positioning control of a head actuator in a disk device utilizing a digital filter

Adaptive vibration control for servo systems in data storage devices

Disk drive rotary actuator system including synchronous counter torque generator

Apparatus for controlling a optical disk drive

Optical disk drive and method for counting the number of tracks on an optical disk

Digital filter, servo control unit, and disk drive

Arrangement structure of the printed circuit board and the interface cable connector of a magnetic disk drive

Method and apparatus for controlling data write operations

Spindle motor startup method and apparatus

Data storage device servo control apparatus and method

Optical disk drive and methods for counting the number of tracks on an optical disk

Focusing servo in an optical disk drive

Optical disk drive apparatus for searching a target track

Method and apparatus for initializing optical disk drive apparatus

Apparatus and method for controlling the velocity of a disk storage head

System and method for stabilizing disk drive rotation control

Focus acquiring method and optical disk drive

Method for putting an optical head in a stationary state and optical disk drive apparatus

Testing method and tester

Method and system for compensating a head positioning servo in a storage device

Method and system for controlling the positioning of a read/write head of a data recording device

Magnetic head position detecting method and magnetic disk apparatus

WESTERN DIGITAL TECH INC

Write data protection at emergency power off

Dual spindle motors and dual spindle motor control for data storage

VCM PWM to linear mode transition offset optimization to improve PES

Data storage device having dual actuators and method for emergency power off retract (EPOR) of dual actuators

Data storage device with soft on-disk activation of fine actuators

Write data protection at emergency power off

Data storage device having dual actuators and method for emergency power off retract (EPOR) of dual actuators

VCM PWM to linear mode transition offset optimization to improve PES

Data storage device with closed loop extended park mode during spin down operation

Data storage device with smart ISOFET threshold voltage automatic tuning

Data storage device using windowed delta-sigma analog-to-digital converter in digital current control loop

Data storage device having dual actuators and method for data egress throttling during emergency power off retract (EPOR)

Calibrating elevator actuator for disk drive

Optimize power, RTV, and coupled PES during seek operations

HITACHI GLOBAL STORAGE TECH

System and method for implementing a rotary memory device

Method and system for controlling the positioning of a read/write head of a data recording device

Data storage device having acceleration sensor attached to circuit board for detecting vibrations in planar rotation direction along circuit board

Control method and apparatus for reducing the effects of hard disk contamination

Rotation recording apparatus and method of inspection thereof

Control method and apparatus for reducing the effects of hard disk contamination

HITACHI GLOBAL TECHNOLOGIES

Disk drive, servo control unit, and control unit

HITACHI GLOBAL TECH NL BV

Self-monitoring and self-healing of frequency specific position errors in a data storage device