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''The Long and Short of It
Cyanine discs use a Long Write Strategy, and phthalocyanine discs use a Short Write Strategy. That is, a longer laser pulse produces a more accurate 3T optical mark on cycanine media, and a shorter laser pulse creates a more accurate 3T optical mark on phthalocyanine media. Write strategy, in the currently available generation of CD-Recordable media and drives, is not adjustable for media type. However, a group of engineers, called OSJ (Orange Book Study Group of Japan) has proposed that all CD-R media manufactured include information in the pregroove of the disc that identifies the type of media and tells the CD Recorder which write strategy to use. This proposal will soon be implemented by the manufacturers of CD-R media and the manufacturers of CD recordable drives.''
Kieg. infó:
''Compact discs use pits of varying lengths to represent data. The pits are the same width and depth, but their length and the spaces between them vary. The shortest pit is a 3T pit, and the longest, 11T. In CD-Recordable, the pits are replaced by optical marks that, when read by a CD player or CD-ROM drive, appear similar to the pits in molded Cds. The lengths of the pits or marks are time-relative, not absolute; that is, the length is a function of disc spin. A disc that spins at a rate of 1.2 m/s while being recorded will contain marginally shorter 3T to 11T pits than a disc that spins at 1.4 m/s. It will also contain more of them, which allows for greater disc capacity, but that’s a topic for another column.''
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