Masaomi Ikeda from San Jose, CA, age 50

Method For Controlling Write Current To A Write Head During Data Write On A Hard Disk
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US Patent:

6798598, Sep 28, 2004
Filed:

Mar 5, 2002
Appl. No.:

10/091411
Inventors:

Hiroaki Suzuki - Tokyo, JP
Hideo Asano - Tokyo, JP
Yumi Nagano - Kanagawa-ken, JP
Michio Nakajima - Kanagawa-ken, JP
Masaomi Ikeda - Rochester MN
Masashi Murai - Kanagawa-ken, JP
Assignee:

International Business Machines Corporation - Armonk NY
International Classification:

G11B 502
US Classification:

360 68, 327110
Abstract:

A method for controlling write current to a write head during data write on a hard disk drive is disclosed. A direct access storage device includes a rotating storage medium in which data are magnetically written, a write head for writing data in the rotating storage medium, and a write current control circuit for changing write current-value settings to be supplied to the write head according to a predetermined elapsed time from the beginning of a write operation.

Write Track Shift Control In Shingled-Microwave-Assisted Magnetic Recording (Mamr-Smr)
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US Patent:

8553507, Oct 8, 2013
Filed:

Nov 13, 2012
Appl. No.:

13/675836
Inventors:

- Amsterdam, NL
Masaomi Ikeda - San Jose CA, US
Assignee:

HGST Netherlands B.V. - Amsterdam
International Classification:

G11B 11/00
US Classification:

369 1333, 369 1313
Abstract:

In one embodiment, a magnetic data storage system includes a magnetic disk medium, a microwave-assisted magnetic recording (MAMR) head including a main pole adapted for recording data to the magnetic disk medium having a first recording width, a spin torque oscillator (STO) adapted to apply a high-frequency magnetic field to the magnetic disk medium during a recording operation, wherein the STO is operable or inoperable when in an on or off state, respectively, wherein the main pole has a second recording width when the STO is in the on state, and the second recording width is different from the first recording width, a drive mechanism for passing the magnetic disk medium over the MAMR head, a read head including a magnetoresistance sensor, and a controller adapted for adjusting a shift quantity of the magnetic head depending on whether the STO is in the on or off state.

Masaomi Ikeda