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公开(公告)号：CZ9403020A3
公开(公告)日：1995-03-15
申请号：CZ302094
申请日：1993-05-19
Applicant: IBM , IBM DEUTSCHLAND
Inventor： JAQUETTE GLEN ALAN , TAYEFEH MOROVAT
CPC classification number: G11B7/13 , G11B7/005 , G11B11/10597 , G11B13/04
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公开(公告)号：BR9103889A
公开(公告)日：1992-05-26
申请号：BR9103889
申请日：1991-09-10
Applicant: IBM
Inventor： KULAKOWSKI JOHN E , MEANS RODNEY J , TAYEFEH MOROVAT
IPC: G11B7/00 , G11B7/0045 , G11B7/0055 , G11B7/007 , G11B7/013 , G11B11/10 , G11B11/105 , G11B20/12 , G11B11/12 , G11B23/30
Abstract: The present invention relates to a re-writable data storage member (10) comprising a plurality of spaced apart addressable data storage areas (12) for recording and storing data and a plurality of non-data storage areas (15) interposed between adjacent ones of the addressable data storage areas for recording signals not representing data, the storage member being adapted to be scanned in a direction over the storage areas. According to the invention the storage member is characterised in that one of the addressable data storage areas contains first machine readable indicia indicating that the storage member contains data which is not to be changed from any original recording of the data, another of the addressable data storage areas contains second machine readable indicia indicating whether or not the storage member has been erased of data in its entirety, and each of the non-data storage areas contains third machine readable indicia indicating whether or not one of the respective adjacent addressable data storage areas can be written into. The invention also relates to a data storage system comprising a re-writable data storage member as above and to a method of operating such a data storage system.
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公开(公告)号：CA2036958A1
公开(公告)日：1991-09-02
申请号：CA2036958
申请日：1991-02-25
Applicant: IBM
Inventor： FINKELSTEIN BLAIR I , TAYEFEH MOROVAT , UENO HIDEO
IPC: G11B7/00 , G11B7/0045 , G11B7/0055 , G11B7/125 , G11B11/10 , G11B11/105 , G11B20/18 , G11B27/36
Abstract: The present invention relates to a method of calibrating a system for the recording and readback of optically detectable data of the type which comprises a record medium (30) formed from a material which is sensitive to optical radiation, means (67) for generating a beam of light (47), means (33) for scanning the beam of light relative to the surface of the medium, means (75) for selectively varying the intensity of the beam of light so as to record data at selected positions on the surface and means (79) for reading back the recorded data. The calibrating method comprises the operation of controlling the recording intensity of the beam of light so that signals from the readback means have a maximum amplitude. According to the invention the operation of controlling the recording intensity comprises utilising the beam of light to record a plurality of test patterns (29) on the surface of the medium each pattern being recorded with a different intensity of the beam of light, reading back the test patterns and generating a readback test signal from each test pattern, detecting the readback test signal having the largest amplitude, and utilising the intensity of the beam of light used to record the test pattern which generates the readback test signal having the largest amplitude for the light beam when it is recording data. The invention also relates to apparatus for implementing the above method of calibrating.
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公开(公告)号：SK154494A3
公开(公告)日：1995-05-10
申请号：SK154494
申请日：1993-05-19
Applicant: IBM , IBM DEUTSCHLAND
Inventor： JAQUETTE GLEN A , TAYEFEH MOROVAT
Abstract: A circuit for simultaneously detecting both MO and ROM signals reflected from an optical disk so that both signals are present and useable without switching from one to the other. The circuit eliminates switching time and switching transients. Two photodetectors are arranged to sense P and S components of polarized light in order to stimulate a differential amplifier and produce an output representative of MO recorded data. A second amplifier is connected to at least one of the photodetectors to produce an output representative of ROM recorded data and also representative of defects in the MO portion of the optical disk.
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公开(公告)号：CZ302094A3
公开(公告)日：1995-03-15
申请号：CZ302094
申请日：1993-05-19
Applicant: IBM , IBM DEUTSCHLAND
Inventor： JAQUETTE GLEN ALAN , TAYEFEH MOROVAT
Abstract: A circuit for simultaneously detecting both MO and ROM signals reflected from an optical disk so that both signals are present and useable without switching from one to the other. The circuit eliminates switching time and switching transients. Two photodetectors are arranged to sense P and S components of polarized light in order to stimulate a differential amplifier and produce an output representative of MO recorded data. A second amplifier is connected to at least one of the photodetectors to produce an output representative of ROM recorded data and also representative of defects in the MO portion of the optical disk.
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Patent Agency Ranking
公开(公告)号：PL170774B1
公开(公告)日：1997-01-31
申请号：PL30641393
申请日：1993-05-19
Applicant: IBM
Inventor： JAQUETTE GLEN A , TAYEFEH MOROVAT
Abstract: A circuit for simultaneously detecting both MO and ROM signals reflected from an optical disk so that both signals are present and useable without switching from one to the other. The circuit eliminates switching time and switching transients. Two photodetectors are arranged to sense P and S components of polarized light in order to stimulate a differential amplifier and produce an output representative of MO recorded data. A second amplifier is connected to at least one of the photodetectors to produce an output representative of ROM recorded data and also representative of defects in the MO portion of the optical disk.
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公开(公告)号：HUT72803A
公开(公告)日：1996-05-28
申请号：HU9403547
申请日：1993-05-19
Applicant: IBM
Inventor： JAQUETTE GLEN ALAN , TAYEFEH MOROVAT
Abstract: A circuit for simultaneously detecting both MO and ROM signals reflected from an optical disk so that both signals are present and useable without switching from one to the other. The circuit eliminates switching time and switching transients. Two photodetectors are arranged to sense P and S components of polarized light in order to stimulate a differential amplifier and produce an output representative of MO recorded data. A second amplifier is connected to at least one of the photodetectors to produce an output representative of ROM recorded data and also representative of defects in the MO portion of the optical disk.
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公开(公告)号：DE69304068T2
公开(公告)日：1997-02-06
申请号：DE69304068
申请日：1993-05-19
Applicant: IBM
Inventor： JAQUETTE GLEN , TAYEFEH MOROVAT
Abstract: A circuit for simultaneously detecting both MO and ROM signals reflected from an optical disk so that both signals are present and useable without switching from one to the other. The circuit eliminates switching time and switching transients. Two photodetectors are arranged to sense P and S components of polarized light in order to stimulate a differential amplifier and produce an output representative of MO recorded data. A second amplifier is connected to at least one of the photodetectors to produce an output representative of ROM recorded data and also representative of defects in the MO portion of the optical disk.
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公开(公告)号：ES2090251T3
公开(公告)日：1996-10-16
申请号：ES91308436
申请日：1991-09-16
Applicant: IBM
Inventor： KULAKOWSKI JOHN EDWARD , MEANS RODNEY JEROME , TAYEFEH MOROVAT
IPC: G11B7/00 , G11B7/0045 , G11B7/0055 , G11B7/007 , G11B7/013 , G11B11/10 , G11B11/105 , G11B20/12
Abstract: The present invention relates to a re-writable data storage member (10) comprising a plurality of spaced apart addressable data storage areas (12) for recording and storing data and a plurality of non-data storage areas (15) interposed between adjacent ones of the addressable data storage areas for recording signals not representing data, the storage member being adapted to be scanned in a direction over the storage areas. According to the invention the storage member is characterised in that one of the addressable data storage areas contains first machine readable indicia indicating that the storage member contains data which is not to be changed from any original recording of the data, another of the addressable data storage areas contains second machine readable indicia indicating whether or not the storage member has been erased of data in its entirety, and each of the non-data storage areas contains third machine readable indicia indicating whether or not one of the respective adjacent addressable data storage areas can be written into. The invention also relates to a data storage system comprising a re-writable data storage member as above and to a method of operating such a data storage system.
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