Inventor

YASUNA KEI

JP30 patents

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

YASUNA KEI

WESTERN DIGITAL TECH INC

Method to measure thermal protrusion by sensing spacing change due to pre-lasing

Determining laser induced thermal protrusion and laser threshold in heat-assisted magnetic recording (HAMR) data storage

Data storage device with split burst servo pattern

Data storage device with enhanced management of laser pre-bias and logic block addressing in heat-assisted magnetic recording

Data storage device with servo burst signal correction for mitigating effects of servo pattern distortion

Energy-assisted magnetic recording data storage device with opportunistic boosted laser pre-biasing

Data storage device with embedded mode hop predictor patterns

Data storage device with symmetric split burst servo pattern

Data storage device with track pitch determination for mitigating effects of servo pattern distortion

Data storage device employing triangle-like dither to spread track squeeze

HITACHI GLOBAL STORAGE TECH

Servo pattern recording method

Magnetic disk apparatus and servo pattern recording method therefor

Magnetic disk apparatus and servo signal recording method

Magnetic disk device and servo write method

Method of writing pattern in disk, method of following track on disk, and apparatus for writing pattern in disk

Magnetic disk apparatus and servo signal recording method

NONAKA KEIICHIRO

Patterned media with an alternating series of concentric servo zones and overlap zones

Patterned media with an alternating series of concentric servo zones and overlap zones

Servo pattern compatible with planarization constraints of patterned media and use of a single master template

Patterned media with an alternating series of concentric servo zones and overlap zones

Patterned media with an alternating series of concentric servo zones and overlap zones

Servo pattern compatible with planarization constraints of patterned media and use of a single master template

HITACHI LTD

Magnetic disk apparatus and its servo signal recording method

Information recording disk apparatus

Magnetic disc apparatus having actuator for head positioning mechanism

YASUNA KEI

Disk drive and method of writing servo write tracks to a disk

Method and apparatus for positioning a magnetic-recording head

HITACHI GLOBAL STORAGE TECH NL

Method for writing servo data to a disk and disk drive configured to write servo data utilizing the method

ALBRECHT THOMAS R

Servo patterning compatible with planarization of patterned magnetic disks

HATTORI RYOHHEITA

Method for writing servo patterns and disk drive including a controller for writing servo patterns according to the method