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    SPARE AND CALIBRATION SECTOR MANAGEMENT FOR OPTICAL WORM MEDIA
    32.
    发明专利
    SPARE AND CALIBRATION SECTOR MANAGEMENT FOR OPTICAL WORM MEDIA 未知

    公开(公告)号：HK1008608A1

    公开(公告)日：1999-07-16

    申请号：HK98109358

    申请日：1998-07-23

    Applicant: IBM

    Inventor： KULAKOWSKI JOHN EDWARD ,  MCDOWELL JUDSON ALLEN ,  RUBIN KURT ALLAN

    IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/007 ,  G11B7/125 ,  G11B11/105 ,  G11B20/18 ,  G11B

    Abstract: The present invention provides efficient management of calibration and spare sectors on a banded optical write-once, read-many (WORM) disk. A portion of each band on the disk includes a user data area and a reserved area. Sectors in the reserved area are usable either as spare sectors, replacing defective sectors in the user area, or as calibration sectors, for use when the laser write-power level is calibrated. Sectors preferably are used for sparing from one end of the reserved area while sectors are used for calibration from the opposite end. A common overflow reserved area can also be provided for use if all of the sectors in one or more primary reserved areas associated with any of the bands have been exhausted.

    DRIVING SYSTEM OF OPTICAL DISK WITH A GREAT AMOUNT OF DATA LAYERS, WITH CORRECTION OF FIXED ABERATION AND OPTIMIZED DISTRIBUTION OF INTERMEDIATE LAYERS
    35.
    发明专利
    DRIVING SYSTEM OF OPTICAL DISK WITH A GREAT AMOUNT OF DATA LAYERS, WITH CORRECTION OF FIXED ABERATION AND OPTIMIZED DISTRIBUTION OF INTERMEDIATE LAYERS 未知

    公开(公告)号：CZ273597A3

    公开(公告)日：1997-12-17

    申请号：CZ273597

    申请日：1996-02-01

    Applicant: IBM

    Inventor： LATTA MILTON RUSSELL ,  ROSEN HAL JERVIS ,  RUBIN KURT ALLAN ,  TANG WADE WAI-CHUNG

    IPC: G11B7/1378 ,  G11B7/00 ,  G11B7/005 ,  G11B7/24 ,  G11B7/252 ,  G11B7/135

    Abstract: A multiple data layer optical disk drive system has fixed aberration correction and uses a disk with maximum interlayer spacing for reduced interlayer crosstalk. In one embodiment the multiple data layer disk has a substrate with a thickness that is reduced by approximately one-half the thickness of the spacer layer that separates the first and last data layers. The disk is designed to operate with a lens that has spherical aberration correction to compensate for the thickness of a conventional single data layer disk. This allows the disk drive to handle multiple data layer disks as well as to be backward compatible and thus handle conventional single data layer disks. The thickness of the substrate material plus one-half the thickness of the spacer layer material (which may have a different index of refraction than the substrate material) is equivalent, for purposes of spherical aberration correction, to the thickness of the substrate material used in the conventional single data layer disk. The focused spot with minimum spherical aberration is thus located at the middle of the spacer layer rather than on the first data layer. The spacer layer thickness is selected so that when the focused spot is located on either the first or last data layer there is some deliberately designed spherical aberration, although an amount that is acceptable. As a result the thickness of the spacer layer can be significantly increased to thereby reduce interlayer crosstalk. In another embodiment that substrate thickness and spacer layer thickness are selected and then the lens is corrected for spherical aberration corresponding to the thickness of substrate material plus one-half the thickness of spacer layer material.

    MULTIPLE DATA LAYER OPTICAL DISK DRIVE SYSTEM WITH FIXED ABERRATION CORRECTION AND OPTIMUM INTERLAYER SPACING
    36.
    发明专利
    MULTIPLE DATA LAYER OPTICAL DISK DRIVE SYSTEM WITH FIXED ABERRATION CORRECTION AND OPTIMUM INTERLAYER SPACING 未知

    公开(公告)号：CA2215323A1

    公开(公告)日：1996-09-19

    申请号：CA2215323

    申请日：1996-02-01

    Applicant: IBM

    Inventor： ROSEN HAL JERVIS ,  TANG WADE WAI-CHUNG ,  RUBIN KURT ALLAN ,  LATTA MILTON RUSSELL

    IPC: G11B7/1378 ,  G11B7/00 ,  G11B7/005 ,  G11B7/24 ,  G11B7/252 ,  G11B7/135

    Abstract: A multiple data layer optical disk drive system has fixed aberration correction and uses a disk with maximum interlayer spacing for reduced interlayer crosstalk. In one embodiment the multiple data layer disk has a substrate with a thickness that is reduced by approximately one-half the thickness of the spacer layer that separates the first and last data layers. The disk is designed to operate with a lens that has spherical aberration correction to compensate for the thickness of a conventional single data layer disk. This allows the disk drive to handle multiple data layer disks as well as to be backward compatible and thus handle conventional single data layer disks. The thickness of the substrate material plus one-half the thickness of the spacer layer material (which may have a different index of refraction than the substrate material) is equivalent, for purposes of spherical aberration correction, to the thickness of the substrate material used in the conventional single data layer disk. The focused spot with minimum spherical aberration is thus located at the middle of the spacer layer rather than one the first data layer. The spacer layer thickness is selected so that when the focused spot is located on either the first or last data layer there is some deliberately designed spherical aberration, although an amount that is acceptable. As a result the thickness of the spacer layer can be significantly increased to thereby reduce interlayer crosstalk. In another embodiment the substrate thickness and spacer layer thickness are selected and then the lens is corrected for spherical aberration corresponding to the thickness of substrate material plus one-half the thickness of spacer layer material.

    37.
    发明专利
    未知

    公开(公告)号：DE68916567D1

    公开(公告)日：1994-08-11

    申请号：DE68916567

    申请日：1989-02-15

    Applicant: IBM

    Inventor： FOSTER JOHN STUART ,  RUBIN KURT ALLAN ,  RUGAR DANIEL

    IPC: G01Q60/00 ,  G11B9/00 ,  G11B9/14

    Abstract: A method for recording, reading and erasing data bits in a data storage device is described. Using extended scanning tunnelling microscopy (STM) techniques, a tunnelling electron current by resistive heating selectively melts discrete areas of a state-transformable film; then heat is dissipated rapidly, writing data bits by changing the film in the areas from a first state to a second state wherein an electronic property, such as conductance, work function or band gap, in the areas is changed. Again, using extended STM techniques, the effect of this changed electronic property of the film on the tunnelling current is measured for reading the written data bits. Minimising the effect of blemishes on the material is effected, during operation in STM constant current mode by measuring dI/dV or dI/ds, and during operation in STM variable current (constant gap) mode by measuring (dI/dV)/I or (dI/ds)/I. Also, by using extended STM techniques, data bits can be selectively erased by resistance heating the film to a temperature higher than the crystallisation temperature for a sufficient period of time, restoring selected discrete areas to the first state and each affected electronic property substantially to its original condition.

    Multiple data layer optical disk drive system with fixed aberration correction and optimum interlayer spacing
    39.
    发明专利
    Multiple data layer optical disk drive system with fixed aberration correction and optimum interlayer spacing 未知

    公开(公告)号：CZ293793B6

    公开(公告)日：2004-08-18

    申请号：CZ273597

    申请日：1996-02-01

    Applicant: IBM

    Inventor： LATTA MILTON RUSSELL ,  ROSEN HAL JERVIS ,  RUBIN KURT ALLAN ,  TANG WADE WAI-CHUNG

    IPC: G11B7/1378 ,  G11B7/00 ,  G11B7/005 ,  G11B7/24 ,  G11B7/252 ,  G11B7/135

    Abstract: The invented multiple data layer optical disk drive system has fixed aberration correction and uses a disk (12) with maximum interlayer spacing for reduced interlayer crosstalk. In one embodiment the multiple data layer disk (12)¿has a substrate with a thickness that is reduced by approximately one-half the thickness of the spacer layer (44) that separates the first and last data layers. The disk (12) is designed to operate with a lens (210) that has spherical aberration correction to compensate for the thickness of a conventional single data layer disk (12). This allows the disk drive to handle multiple data layer disks as well as to be backward compatible and thus handle conventional single data layer disks. The thickness of the substrate material plus one-half the thickness of the spacer layer material (which may have a different index of refraction than the substrate material) is equivalent, for purposes of spherical aberration correction, to the thickness of the substrate material used in the conventional single data layer disk. The focused spot with minimum spherical aberration is thus located at the middle of the spacer layer rather than one the first data layer. The spacer layer thickness is selected so that when the focused spot is located on either the first or last data layer there is some deliberately designed spherical aberration, although an amount that is acceptable. As a result, the thickness of the spacer layer can be significantly increased to thereby reduce interlayer crosstalk. In another embodiment, the substrate thickness and spacer layer thickness are selected and then the lens is corrected for spherical aberration corresponding to the thickness of substrate material plus one-half the thickness of spacer layer material.

    40.
    发明专利
    未知

    公开(公告)号：DE69719601D1

    公开(公告)日：2003-04-17

    申请号：DE69719601

    申请日：1997-05-22

    Applicant: IBM

    Inventor： ROSEN HAL JERVIS ,  RUBIN KURT ALLAN ,  TANG WADE WAI-CHUNG

    IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/09 ,  G11B7/24 ,  G11B7/243 ,  G11B7/257

    Abstract: A multiple recording layer rewriteable phase-change optical disk (12) and disk drive uses a reverse writing type of reversible phase-change material as the recording layer (53) nearest the incident laser light. The disk has a light-transmissive substrate (50) onto which the laser light is incident. The substrate supports at least two spatially-separated multilayer recording stacks (90, 92), each stack including an active recording layer (53, 64) of reversible or rewriteable phase-change material. The recording stack (90) located nearest the substrate (50) on which the laser light is incident includes a reverse writing type of reversible phase change material, i.e., a phase-change material with an amorphous starting phase that is recorded onto by laser heating that converts data regions to the crystalline phase. This first recording layer (50) has a dielectric layer (51) in contact with it that has a high index of refraction relative to the adjacent recording layer and that acts as an optical interference film to provide a constructive optical interference effect in the recording stack. The optical interference film optimizes the contrast, reflectivity, and transmissivity of the recording stack. The optical interference film is also nonabsorbing so that laser light can pass through it to focus on a recording layer (64) in a farther recording stack (92). This allows the farther recording layer to be written using reasonable laser power.

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