Error checking method and apparatus for digital data in...

Details Error checking method and apparatus for digital data in... Error checking method and apparatus for digital data in...

G - Physics

11

B

352/16, 352/52,

G11B 7/00 (2006.01) G06F 11/00 (2006.01) G06F 11/20 (2006.01) G11B 7/004 (2006.01) G11B 20/10 (2006.01) G11B 20/18 (2006.01) G11B 27/32 (2006.01)

Patent

CA 1115837

ABSTRACT An error checking method and apparatus for recording digital data in an optical recording medium. Digital data are written onto the medium by a modulated laser whose beam is detected by a first photodetector which measures laser output directed toward the recording medium. A second photodetector measures light scattering from the medium, while a third photo- detector detects and measures light transmitted through the recording layer of the medium serving to confirm recording of the data. Amounts of trans- mitted light or scattered light from the medium are correlated to the laser output and to expected values of the light for detecting errors in recoding medium eliminates a large fraction of potential errors.

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