Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1985-03-04
1987-02-10
Faber, Alan
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 58, 369101, 369111, 365200, 250562, 250578, G11B 2736, G11B 700
Patent
active
046428038
ABSTRACT:
A system for recovering data, both prerecorded and user data, from a reflective optical data storage medium, with the further capability of distinguishing data from foreign particulate matter on the data disk. A pair of detectors measures the fraction of light reflected from and transmitted through the data disk and, knowing the fraction of light absorbed by the disk, distinguishes user data from prerecorded data and particulate matter. The data disk has different optical characteristics for prerecorded and user data, the prerecorded information being black, highly absorptive silver, while the user data consists of pits of relatively high transmissivity in a reflective field. Particulate matter is recognized by intermediate reflectivity and transmissivity. The optical characteristics of the material are enhanced or exaggerated so that the two types of data and particulate matter can be distinguished.
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"Holographic Disc Diffraction Efficiency Tester" by Lawton, IBM Tech. Disc. Bul., vol. 23, No. 6, Nov. 1980, pp. 2424-2425.
Drexler Technology Corporation
Faber Alan
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