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CD-ROM
The Compact Disc-Read Only Memory is the standard 12cm CD formatted according to the
ISO 9660 standard. Although the physical characteristics and track structure of a CD-ROM are
the same as that of CD-Audio, a CD-ROM is used to store computer data (text, graphics). It
also has additional error detection and correction.
CD-ROM Drives
The original drives had a transfer rate of 150 KBytes/second, but recent drives offer double,
quadruple and even higher transfer rates-and are known as 2X, 4X, 32X and so on.
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.
Driver
In computers, drivers refers to a device driver, which is software that, under CPU control,
implements device I/O functions or other functionality (video, sharing, graphics, printer,
mouse, etc.).
DVD
Digital Versatile Disc is another 12 CM optical disc that is used for movies, data storage and
soon music. DVD specifications include a double-layer single-sided CD with a capacity of
4.7GB, with sufficient playing time for a full-length movie that is encoded in MPEG-2.
Format
In the computer arena, there are physical and logical formats for storage devices. Magnetic
storage devices implement a physical structure (MFM, RLE, etc.). The first standard logical
format for Compact Discs is defined by the ISO 9660, which specifies the volume, file and block
structure.
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Appendix