Inventor

OTTESEN HAL HJALMAR

US81 patents

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

OTTESEN HAL HJALMAR

IBM

Method and apparatus for limiting soft error recovery in a disk drive data storage device

Multimedia direct access storage device and formatting method

Method and apparatus for managing a heterogeneous data storage system

Method and apparatus for implementing an in-situ digital harmonic computation facility for direct access storage device (DASD)

Multiple element transducer for magnetic recording

System and method for detecting head-to-disk contact in-situ a direct access storage device using a position error signal

Multimedia server system and method for communicating multimedia information

Disk drive having optimized spindle speed for environment

Multimedia control system and method for controlling multimedia program presentation

Media-on-demand communication system and method employing direct access storage device

Intelligent multimedia set-top control method and apparatus in which billing signals are communicated to an information network upon presentation of downloaded media programs

Multimedia direct access storage device and formatting method

Multimedia direct access storage device and formatting method

Real-time head-to-disk clearance measuring method and apparatus

Method and apparatus for positioning a dual element magnetoresistive head

Disk drive having optimized spindle speed for environment

Method and apparatus for controlling a multiple-stage actuator for a disk drive

Method and apparatus for ramp load and unload

Method and apparatus for controlling a multiple-stage actuator for a disk drive

Method and apparatus for real-time filtering of a position error signal for a disk drive servo system

Disk drive having position sensor for ramp load and unload, and method for its use

Power saving method and apparatus for use in multiple frequency zone drives

Method and apparatus for restoring a thermal response signal of a magnetoresistive head

Method and apparatus for positioning a magnetoresistive head using thermal response to servo information on the record medium

System for equalizing operating temperature by allocating infrequently accessed data to the high temperature DASD and allocating frequently accessed data to the low temperature DASD

Method and apparatus for separating magnetic and thermal components from an MR read signal

Readback signal detection and analysis in a magnetic data storage system

Methods and apparatus for detection and analysis of an envelope of a frequency modulated readback signal in a magnetic storage system

System and method for identifying and filtering a head suspension assembly resonance frequency

Method for positioning a magnetoresistive head using a thermal response to servo information on the record medium

Rigid disk surface defect detection and classification

In situ method and apparatus for detecting surface defects to identify handling damage in a disk drive

Method and apparatus for positioning a magnetoresistive head using thermal response to servo information on the record medium

In situ offset correction for position error signal

Method and apparatus for real-time filtering of a position error signal for a disk drive servo system

Method and apparatus for real-time filtering of a position error signal for a disk drive servo system

Method and apparatus for positioning a magnetoresistive head

Method and apparatus for positioning a dual element magnetoresistive head using thermal signals

Method and apparatus for evasive maneuvering to keep DASD heads away from protruding surface defects

Method and apparatus for calibrating a thermal response of a magnetoresistive transducer

Method and apparatus for calibrating a thermal response of a magnetoresistive element

Method and apparatus for rotary actuator arc compensation correction in a direct access storage device

HITACHI GLOBAL STORAGE TECH

System and method for estimating a frequency of slider airbearing resonance

Apparatus for look-ahead thermal sensing in a data storage device

Servo format for disk drive data storage devices

Adaptive dual-frequency notch filter

Method and apparatus for in situ detection of high-flying sliders over customer data

Method and apparatus for estimating the flyheight of an airbearing slider in a storage device using variable spindle velocity

Power savings method and apparatus for disk drives

Method and apparatus for predictive failure analysis technique for head crashes in hard drives using position error signal