Inventor
AOI HAJIME
JP32 patents
⚠️ This page may combine multiple inventors who share the name “AOI HAJIME”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
28 patentsUS6243824B1Jun 5, 2001
Array disk subsystem
HITACHI LTD62 citations96
US5568331AOct 22, 1996
Method of head positioning and magnetic recording disk drive using the same
HITACHI LTD67 citations96
US5416331AMay 16, 1995
Surface atom fabrication method and apparatus
HITACHI LTD69 citations96
US5402428AMar 28, 1995
Array disk subsystem
HITACHI LTD79 citations96
US5193034AMar 9, 1993
Magnetic disk apparatus of constant-density recording type, magnetic disk used therefor and servo-writing device for patterning on the magnetic disk
HITACHI LTD75 citations96
US5689494ANov 18, 1997
Surface atom fabrication method and apparatus
HITACHI LTD22 citations92
US5572699ANov 5, 1996
Variable length data in a parallel disk array
HITACHI LTD33 citations92
US5287228AFeb 15, 1994
Peak detection method and apparatus therefor
HITACHI LTD36 citations92
US4907100AMar 6, 1990
Readout circuit in magnetic recording device
HITACHI LTD24 citations91
US4774601ASep 27, 1988
Read channel for magnetic recording
HITACHI LTD21 citations82
US5740142AApr 14, 1998
Method and apparatus for fast transfer of data in recording and reproducing system
HITACHI LTD9 citations74
US5325364AJun 28, 1994
Method for error correction and circuit for realizing same
HITACHI LTD9 citations74
US5132854AJul 21, 1992
High speed seek sector servo magnetic disk drive unit
HITACHI LTD19 citations74
US5008761AApr 16, 1991
Readout circuit in magnetic recording device
HITACHI LTD10 citations74
US4777553AOct 11, 1988
Magnetic head
HITACHI LTD7 citations74
US4755891AJul 5, 1988
Circuit for processing waveform of reproduced signal in magnetic reproducing apparatus
HITACHI LTD7 citations74
US4644424AFeb 17, 1987
Equalizer used for magnetic storage device
HITACHI LTD7 citations74
US5572379ANov 5, 1996
Magnetic recording drive having arrangements for average useful life of magnetorestive effects sensors
HITACHI LTD6 citations73
US5109311AApr 28, 1992
Magnetic disk device and method of recording/retrieving information
HITACHI LTD17 citations73
US5337198AAug 9, 1994
Digital magnetic writing and reading apparatus
HITACHI LTD12 citations72
US4851939AJul 25, 1989
Actuator driving apparatus and magnetic disk drive system with a smaller number of high power amplifiers than actuators
HITACHI LTD7 citations71
US4792497ADec 20, 1988
Magnetic recording media for longitudinal recording
HITACHI LTD10 citations71
US4249219AFeb 3, 1981
Current drive circuit for an induction coil
HITACHI LTD15 citations71
US5671107ASep 23, 1997
Large capacity magnetic disc apparatus with a particular relationship between pole thickness, saturated flux density, and recording wavelength
HITACHI LTD2 citations63
US4823208AApr 18, 1989
Multi slice level signal circuit
HITACHI LTD5 citations62
US4651236AMar 17, 1987
Waveform equalizing circuit
HITACHI LTD4 citations60
US6069762AMay 30, 2000
Magnetic recording drive having arrangement for averaging useful life of magnetoresistive effect sensors
HITACHI LTD0 citations52
US6014275AJan 11, 2000
Magnetic recording drive
HITACHI LTD0 citations52