CD-Recordable
CD-Recordable technology allows production of CD-ROMs on the desktop (one-offs).
It requires a CD-R recorder, appropriate software, a PC, and appropriate media. CD-
Recordable involves a special CD, the one-off’ blank, very different from the mass
reproduced or ‘hot-pressed’ CDs. It is sold pre-grooved, in 63 or 74 minute capacities,
and it involves a layered structure-with a sensitive chemical recording layer, almost
always with a gold reflective layer, and ready for a CD- Recordable drive. Once recorded,
the CD-Recordable discs (one-offs) perform in the same way as the mass-reproduced CDs.
CD-ROM
The Compact Disc-Read Only Memory is the standard 12cm CD formatted according
to the ISO 9660. Although the physical characteristics and track structure of a CD-
ROM are the some as that of CD-Audio, a CD-ROM is used to store computer data
(text, graphics). It also involves additional error detection and correction.
CD-ROM Drives
The original drives had a transfer rate of 150 KB/second, but recent drives offer double,
quadruple and even higher transfer rates-and are known as 2X, 6X, and so on.
Current drives can handle audio tracks and, for multimedia, have connections -for the
sound card. Some recent drives are also XA-ready, and/or PhotoCD ready, with or
without multiple session capability.
CD-ROM XA
CD-ROM Extended Architecture, is used for data, graphics, video, and compressed
audio, in an interleaved scheme (CD-I structure) making it possible to read and display
jointly text, graphics and audio files of various sample sizes, up to 20 hours of 4-bit
mono aural sound. Kodak’s Photo CD for example, uses XA tracks, and it can there-
fore be read by an XA drive.
CD-REWRITABLE
CD-Rewritable technology allows for the CD-Rewritable media to be erased and
rewritten over and over again up to 1000 times.
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Appendix A
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