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Hal H Ottesen

from Mazeppa, MN
Age ~87
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Also known as:
Hal Dr Ottesen, Hal A Ottesen, Hal G Ottesen, Hjalmar H Ottesen, Hsalmar H Ottesen, Hal H Otesen
Phone and address:
42478 County Road 85, Mazeppa, MN 55956
(507) 843-5001
Related to:
Jessica J Ottesen, 49Joseph L Halfman, 54Yasir Aziz, 45Debra Jean Carr, 64Eric M Ottesen, 50Joseph C Cerny, 57Christian H Ottesen, 60Ann M Lucke, 44Greta S Ottesen, 85
Connected to:
Evan A Ottesen, 38Melissa A Ottesen, 54Nathaniel C Ottesen, 33Peter A Ottesen, 60Chad M Otteson, 45Elmer W Otteson, 76Ingrid A Otteson, 61Jay W Otteson, 65Melissa A Otteson, 47Nelson S Otteson, 85

Hal Ottesen Phones & Addresses

  • 42478 County Road 85, Mazeppa, MN 55956 (507) 843-5001
  • 4230 Stoneham Ln, Rochester, MN 55901
  • Highlands Ranch, CO
  • 42478 County Road 85, Mazeppa, MN 55956

Work

Company: University of minnesota rochester Position: Professor

Education

Degree: B Sc, M Sc, Ph D School / High School: University of Colorado at Boulder 1959 to 1968 Specialities: controls, random systems, signal processing

Industries

Information Technology and Services

Resumes

Resumes

Hal Ottesen Photo 1

Professor At University Of Minnesota Rochester

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Position:
Professor at University of Minnesota Rochester
Location:
Rochester, Minnesota Area
Industry:
Information Technology and Services
Work:
University of Minnesota Rochester
Professor
University of Minnesota Digital Technology Center 2000 - 2009
Professor
IBM - Rochester, Minnesota Area 1962 - 1994
Senior Technical Staff Member (1991 - 1994)
Education:
University of Colorado at Boulder 1959 - 1968
B Sc, M Sc, Ph D, controls, random systems, signal processing

Business Records

Name / Title
Company / Classification
Phones & Addresses
Hal Ottesen
President
Tutorial Technology Inc
Business Consulting Services
42478 County Rd 85, Mazeppa, MN 55956
(507) 843-5001

Publications

Us Patents

Method For Positioning A Magnetoresistive Head Using A Thermal Response To Servo Information On The Record Medium

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US Patent:
6384994, May 7, 2002
Filed:
Feb 1, 2000
Appl. No.:
09/495188
Inventors:
Gordon J. Smith - Rochester MN
Hal Hjalmar Ottesen - Rochester MN
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 502
US Classification:
360 25, 360 7703, 360 75, 360 721
Abstract:
The present invention is a method and apparatus for positioning a magnetoresistive (MR) head relative to a storage medium in a storage device. The storage medium is mounted in the storage device to allow relative movement between the MR head and the storage medium. The storage medium includes servo information provided to induce a thermal response in the MR head. A controller controls the relative movement between the MR head and the storage medium using the thermal response induced in the MR head.

System And Method For Extending The Operating Life Of A Magnetoresistive Transducer Provided In A Disk Drive System

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US Patent:
6385000, May 7, 2002
Filed:
Aug 21, 1998
Appl. No.:
09/137983
Inventors:
Hal Hjalmar Ottesen - Rochester MN
Gordon James Smith - Rochester MN
Donald R. Tobie - Zumbrota MN
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 1512
US Classification:
360 63, 360 66, 360 7705, 360 7708
Abstract:
An apparatus and method for extending the service life of an MR element incorporated in a read/write head involves detecting periods of disk drive system inactivity and selectively switching between the heads for purposes of reading servo information during the inactive periods. Switching between heads may involve selecting each of the heads for reading servo information during one or more periods of disk drive system inactivity or selecting each of the heads in sequence during a respective period of system inactivity. Selecting between heads may also involve selecting a head having a minimum of usage, such as a head having an MR element with a minimum of cumulative operational time or energy dissipation relative to other MR elements provided in the disk drive system. Selecting between heads may further include selectively activating each of the heads for reading servo information for a predetermined duration of time during one or more periods of system idleness. An alternative method involves moving the head to a target location, such as a location of maximum head-to-disk clearance, over a surface of a data storage disk, and reducing the servo sampling rate during a period of system inactivity.

Method And Apparatus For Restoring A Thermal Response Of A Magnetoresistive Read Transducer

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US Patent:
6392841, May 21, 2002
Filed:
Jul 16, 1999
Appl. No.:
09/356085
Inventors:
Hal Hjalmar Ottesen - Rochester MN
Gordon James Smith - Rochester MN
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 502
US Classification:
360137, 360 46, 360 67, 360 25
Abstract:
A method and apparatus for processing a readback signal obtained from a storage medium using a magnetoresistive (MR) element restores a thermal signal component of the signal. A readback signal obtained from the storage medium comprises a thermal component representing a thermal response of the MR element, and may further comprise a magnetic component representing servo or user data. The readback signal is filtered so as to degrade the thermal component of the signal, typically by amplification circuitry exhibiting a highpass filtering behavior. The highpass filtered readback signal is further filtered using a lowpass filter. The filtered signal is sampled, and a sliding window comprising a series of binary values is applied to groups of the signal samples to produce a plurality of signal sample values for each of the signal sample groups. The signal sample values for each of the signal sample groups are summed to produce a restored thermal signal substantially representative of the thermal component of the readback signal. A highpass magnetic readback signal may also be operated on to produce a restored thermal component.

Method And Apparatus For Detection Slider Airbearing Resonance Using Sat P-List Data

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US Patent:
6407874, Jun 18, 2002
Filed:
Mar 30, 2000
Appl. No.:
09/539047
Inventors:
Gordon James Smith - Rochester MN
Hal Hjalmar Ottesen - Rochester MN
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 502
US Classification:
360 25, 324212
Abstract:
A method and apparatus are provided for detection of the presence of slider airbearing resonance using surface analysis test (SAT) primary defect list (P-list) data. The P-list in the disk drive is selected. Checking for a cluster threshold of adjacent tracks within a sector to identify a SAT cluster is performed. Responsive to identifying the SAT cluster, checking for multiple defects on some tracks within the SAT cluster is performed. Responsive to identifying multiple defects on some tracks within the SAT cluster, the SAT cluster is converted to a binary matrix map. A histogram is generated for the binary matrix map. The harmonic magnitude content of the histogram from harmonics centered about a predetermined slider airbearing resonance frequency is identified. A harmonic power ratio (HPR) for the SAT cluster is computed and compared with a harmonic power ratio threshold Responsive to the computed HPR being greater than the harmonic power ratio threshold, a wave-front frequency of the SAT cluster is computed.

Adaptive Compensation For Arm Electronics Amplification Circuitry Of A Disk Drive System

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US Patent:
6415238, Jul 2, 2002
Filed:
Jul 16, 1999
Appl. No.:
09/354503
Inventors:
Hal Hjalmar Ottesen - Rochester MN
Gordon James Smith - Rochester MN
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G06F 1900
US Classification:
702109, 702 66, 360 67
Abstract:
An apparatus and method for estimating one or more pole frequencies of an amplifier circuit, such as a readback signal amplifier circuit implemented in an arm electronics module of a data storage system, are disclosed. A bias signal that biases the read transducer is modulated at first and second modulation frequencies while a readback signal is obtained from a data storage medium using the read transducer. The readback signal is communicated to the amplifier, and an output signal of the amplifier circuit is measured at the respective first and second modulation frequencies. The amplifier pole frequency is determined by computing a square impedance measurement ratio using square magnitudes of the bias signal and the amplifier output signal respectively measured at the first and second modulation frequencies.

System And Method For Identifying And Filtering A Head Suspension Assembly Resonance Frequency

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US Patent:
6417982, Jul 9, 2002
Filed:
Dec 2, 1998
Appl. No.:
09/204131
Inventors:
Hal Hjalmar Ottesen - Rochester MN
Gordon James Smith - Rochester MN
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 5596
US Classification:
360 7702
Abstract:
A method and apparatus for identifying and filtering a resonance frequency of a support structure supporting a read/write head in proximity with a data storage medium involves obtaining a particular sample of a position error signal (PES) frequency transform, preferably using Goertzels algorithm. The velocity of the data storage medium is varied, and the magnitude of a particular PES frequency transform sample is computed at each of the velocities. A resonance frequency of the support structure is calculated using the velocity associated with the particular sample having a maximum magnitude. The effects of one or more resonance frequencies associated with a read/write head suspension may be canceled in a position error signal using one or more programmable filters provided in each servo loop. A processor programs the filters using the calculated resonance frequencies and adjusts to compensate for the additional lag introduced into the respective servo loops by the selected programmable filters. A method and apparatus for identifying one or more resonance frequencies of one or more read/write head support structures according to the principles of the present invention may be implemented in a data storage system and, preferably, implemented in-situ a data storage system without resort to circuitry external to the data storage system.

Apparatus With And Method Of Unique Disk Identification For Magnetic Hard Disk Drives

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US Patent:
6424484, Jul 23, 2002
Filed:
Feb 18, 2000
Appl. No.:
09/506968
Inventors:
Hal Hjalmar Ottesen - Rochester MN
Gordon James Smith - Rochester MN
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 2102
US Classification:
360 75, 360 48
Abstract:
A bar coded magnetic recording pattern uniquely identifying the disk of a disk drive is disposed, at the time the disk is single disk tested and accepted, in a reserved area that is not used for data recording by the disk drive assembly. The identifying recording is disposed in a reserved region that is accessible by the magnetic transducer of the disk drive. The identifying recording may be read to determine the orientation of the disk in the disk drive and may be read to positively identify the disk to permit repair, recall or data transfer from specifically identified disks without shut down and/or disassembly of the disk drives incorporating the designated disks.

Method And Apparatus For Implementing An In-Situ Digital Harmonic Computation Facility For Direct Access Storage Device (Dasd)

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US Patent:
6519102, Feb 11, 2003
Filed:
Apr 27, 2000
Appl. No.:
09/559996
Inventors:
Gordon James Smith - Rochester MN
Hal Hjalmar Ottesen - Rochester MN
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 509
US Classification:
360 31, 360 75
Abstract:
A method and apparatus are provided for implementing an in-situ digital harmonic computation facility for direct access storage device (DASD). A digital sequence output of a DASD channel from a constant write frequency field on a disk surface is applied to a plurality of adders for modulo-n summing the digital sequence. A harmonics computation block provides discrete Fourier transform computing based upon the summed modulo-n digital sequence to produce a plurality of harmonic coefficients. A plurality of estimate functions utilize predetermined ones of the plurality of harmonic coefficients for estimation of predefined conditions in the DASD. The plurality of estimate functions include a flyheight estimate function, a readback signal asymmetry estimate function and a thermal activity estimate function.
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Hal H Ottesen from Mazeppa, MN, age ~87 Get Report