Kei Yasuna

Person

Fujisawa-shi, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Data storage device with enhanced management of laser pre-bias and...
- Patent number 12,046,265
- Issue date Jul 23, 2024
- Western Digital Technologies, Inc.
- Guoxiao Guo
- G11 - INFORMATION STORAGE
Information Patent Grant
Data storage device with split burst servo pattern
- Patent number 11,830,524
- Issue date Nov 28, 2023
- Western Digital Technologies, Inc.
- Kei Yasuna
- G11 - INFORMATION STORAGE
Information Patent Grant
Method to measure thermal protrusion by sensing spacing change due...
- Patent number 11,587,587
- Issue date Feb 21, 2023
- Western Digital Technologies, Inc.
- Kei Yasuna
- G11 - INFORMATION STORAGE
Information Patent Grant
Determining laser induced thermal protrusion and laser threshold in...
- Patent number 11,587,586
- Issue date Feb 21, 2023
- Western Digital Technologies, Inc.
- Kei Yasuna
- G11 - INFORMATION STORAGE
Information Patent Grant
Data storage device employing triangle-like dither to spread track...
- Patent number 10,923,146
- Issue date Feb 16, 2021
- Western Digital Technologies, Inc.
- Guoxiao Guo
- G11 - INFORMATION STORAGE
Information Patent Grant
Disk drive and method of writing servo write tracks to a disk
- Patent number 8,873,183
- Issue date Oct 28, 2014
- HGST Netherlands B.V.
- Kei Yasuna
- G11 - INFORMATION STORAGE
Information Patent Grant
Servo pattern compatible with planarization constraints of patterne...
- Patent number 8,743,496
- Issue date Jun 3, 2014
- HGST Netherlands B.V.
- Keiichiro Nonaka
- G11 - INFORMATION STORAGE
Information Patent Grant
Servo pattern compatible with planarization constraints of patterne...
- Patent number 8,670,207
- Issue date Mar 11, 2014
- HGST Netherlands B.V.
- Keiichiro Nonaka
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Patterned media with an alternating series of concentric servo zone...
- Patent number 8,630,051
- Issue date Jan 14, 2014
- HGST Netherlands B.V.
- Keiichiro Nonaka
- G11 - INFORMATION STORAGE
Information Patent Grant
Patterned media with an alternating series of concentric servo zone...
- Patent number 8,625,219
- Issue date Jan 7, 2014
- HGST Netherlands B.V.
- Keiichiro Nonaka
- G11 - INFORMATION STORAGE
Information Patent Grant
Patterned media with an alternating series of concentric servo zone...
- Patent number 8,619,379
- Issue date Dec 31, 2013
- HGST Netherlands B.V.
- Keiichiro Nonaka
- G11 - INFORMATION STORAGE
Information Patent Grant
Method and apparatus for positioning a magnetic-recording head
- Patent number 8,559,126
- Issue date Oct 15, 2013
- HGST Netherlands B.V.
- Kei Yasuna
- G11 - INFORMATION STORAGE
Information Patent Grant
Patterned media with an alternating series of concentric servo zone...
- Patent number 8,531,794
- Issue date Sep 10, 2013
- HGST Netherlands, B.V.
- Keiichiro Nonaka
- G11 - INFORMATION STORAGE
Information Patent Grant
Servo patterning compatible with planarization of patterned magneti...
- Patent number 8,526,132
- Issue date Sep 3, 2013
- HGST Netherlands, B.V.
- Thomas R. Albrecht
- G11 - INFORMATION STORAGE
Information Patent Grant
Method for writing servo patterns and disk drive including a contro...
- Patent number 8,085,489
- Issue date Dec 27, 2011
- Hitachi Global Storage Technologies, Netherlands B.V.
- Ryohheita Hattori
- G11 - INFORMATION STORAGE
Information Patent Grant
Method for writing servo data to a disk and disk drive configured t...
- Patent number 8,023,220
- Issue date Sep 20, 2011
- Hitachi Global Storage Technologies, Netherlands B.V.
- Masaki Yoshioka
- G11 - INFORMATION STORAGE
Information Patent Grant
Method of writing pattern in disk, method of following track on dis...
- Patent number 7,646,561
- Issue date Jan 12, 2010
- Hitachi Global Storage Technologies Netherlands B.V.
- Kohji Takasaki
- G11 - INFORMATION STORAGE

Patents Applicationslast 30 patents

Information Patent Application
DATA STORAGE DEVICE WITH ENHANCED MANAGEMENT OF LASER PRE-BIAS AND...
- Publication number 20240221783
- Publication date Jul 4, 2024
- Western Digital Technologies, Inc.
- Guoxiao Guo
- G11 - INFORMATION STORAGE
Information Patent Application
ENERGY-ASSISTED MAGNETIC RECORDING DATA STORAGE DEVICE WITH OPPORTU...
- Publication number 20240221784
- Publication date Jul 4, 2024
- Western Digital Technologies, Inc.
- Guoxiao Guo
- G11 - INFORMATION STORAGE
Information Patent Application
DATA STORAGE DEVICE WITH SPLIT BURST SERVO PATTERN
- Publication number 20230402062
- Publication date Dec 14, 2023
- Western Digital Technologies, Inc.
- Kei Yasuna
- G11 - INFORMATION STORAGE
Information Patent Application
PATTERNED MEDIA WITH AN ALTERNATING SERIES OF CONCENTRIC SERVO ZONE...
- Publication number 20130010382
- Publication date Jan 10, 2013
- Keiichiro Nonaka
- G11 - INFORMATION STORAGE
Information Patent Application
SERVO PATTERN COMPATIBLE WITH PLANARIZATION CONSTRAINTS OF PATTERNE...
- Publication number 20130010385
- Publication date Jan 10, 2013
- Keiichiro Nonaka
- B82 - NANO-TECHNOLOGY
Information Patent Application
PATTERNED MEDIA WITH AN ALTERNATING SERIES OF CONCENTRIC SERVO ZONE...
- Publication number 20130010388
- Publication date Jan 10, 2013
- Keiichiro Nonaka
- G11 - INFORMATION STORAGE
Information Patent Application
SERVO PATTERN COMPATIBLE WITH PLANARIZATION CONSTRAINTS OF PATTERNE...
- Publication number 20130010384
- Publication date Jan 10, 2013
- Keiichiro Nonaka
- G11 - INFORMATION STORAGE
Information Patent Application
PATTERNED MEDIA WITH AN ALTERNATING SERIES OF CONCENTRIC SERVO ZONE...
- Publication number 20130010383
- Publication date Jan 10, 2013
- Keiichiro Nonaka
- G11 - INFORMATION STORAGE
Information Patent Application
PATTERNED MEDIA WITH AN ALTERNATING SERIES OF CONCENTRIC SERVO ZONE...
- Publication number 20130010389
- Publication date Jan 10, 2013
- Keiichiro Nonaka
- G11 - INFORMATION STORAGE
Information Patent Application
SERVO PATTERNING COMPATIBLE WITH PLANARIZATION OF PATTERNED MAGNETI...
- Publication number 20110188149
- Publication date Aug 4, 2011
- Thomas R. Albrecht
- G11 - INFORMATION STORAGE
Information Patent Application
Disk Drive And Method Of Writing Servo Write Tracks To A Disk
- Publication number 20110141599
- Publication date Jun 16, 2011
- Kei Yasuna
- G11 - INFORMATION STORAGE
Information Patent Application
METHOD FOR WRITING SERVO DATA TO A DISK AND DISK DRIVE CONFIGURED T...
- Publication number 20110080672
- Publication date Apr 7, 2011
- Masaki Yoshioka
- G11 - INFORMATION STORAGE
Information Patent Application
METHOD AND APPARATUS FOR POSITIONING A MAGNETIC-RECORDING HEAD
- Publication number 20110063751
- Publication date Mar 17, 2011
- Kei YASUNA
- G11 - INFORMATION STORAGE
Information Patent Application
METHOD FOR WRITING SERVO PATTERNS AND DISK DRIVE INCLUDING A CONTRO...
- Publication number 20100033868
- Publication date Feb 11, 2010
- Ryohheita HATTORI
- G11 - INFORMATION STORAGE
Information Patent Application
Method for forming servo pattern and magnetic disk drive
- Publication number 20090009904
- Publication date Jan 8, 2009
- Kei Yasuna
- G11 - INFORMATION STORAGE
Information Patent Application
Method of writing pattern in disk, method of following track on dis...
- Publication number 20080068741
- Publication date Mar 20, 2008
- Hitachi Global Storage Technologies Netherlands B.V.
- Kohji Takasaki
- G11 - INFORMATION STORAGE

Person

Patents Grantslast 30 patents

Data storage device with enhanced management of laser pre-bias and...

Data storage device with split burst servo pattern

Method to measure thermal protrusion by sensing spacing change due...

Determining laser induced thermal protrusion and laser threshold in...

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

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

Servo pattern compatible with planarization constraints of patterne...

Servo pattern compatible with planarization constraints of patterne...

Patterned media with an alternating series of concentric servo zone...

Patterned media with an alternating series of concentric servo zone...

Patterned media with an alternating series of concentric servo zone...

Method and apparatus for positioning a magnetic-recording head

Patterned media with an alternating series of concentric servo zone...

Servo patterning compatible with planarization of patterned magneti...

Method for writing servo patterns and disk drive including a contro...

Method for writing servo data to a disk and disk drive configured t...

Method of writing pattern in disk, method of following track on dis...

Patents Applicationslast 30 patents

DATA STORAGE DEVICE WITH ENHANCED MANAGEMENT OF LASER PRE-BIAS AND...

ENERGY-ASSISTED MAGNETIC RECORDING DATA STORAGE DEVICE WITH OPPORTU...

DATA STORAGE DEVICE WITH SPLIT BURST SERVO PATTERN

PATTERNED MEDIA WITH AN ALTERNATING SERIES OF CONCENTRIC SERVO ZONE...

SERVO PATTERN COMPATIBLE WITH PLANARIZATION CONSTRAINTS OF PATTERNE...

PATTERNED MEDIA WITH AN ALTERNATING SERIES OF CONCENTRIC SERVO ZONE...

SERVO PATTERN COMPATIBLE WITH PLANARIZATION CONSTRAINTS OF PATTERNE...

PATTERNED MEDIA WITH AN ALTERNATING SERIES OF CONCENTRIC SERVO ZONE...

PATTERNED MEDIA WITH AN ALTERNATING SERIES OF CONCENTRIC SERVO ZONE...

SERVO PATTERNING COMPATIBLE WITH PLANARIZATION OF PATTERNED MAGNETI...

Disk Drive And Method Of Writing Servo Write Tracks To A Disk

METHOD FOR WRITING SERVO DATA TO A DISK AND DISK DRIVE CONFIGURED T...

METHOD AND APPARATUS FOR POSITIONING A MAGNETIC-RECORDING HEAD

METHOD FOR WRITING SERVO PATTERNS AND DISK DRIVE INCLUDING A CONTRO...

Method for forming servo pattern and magnetic disk drive

Method of writing pattern in disk, method of following track on dis...