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There are two modes for Data CD storage. Under the first mode the scheme is essentially the same as the CD-A standard with 304 bytes per 2,352 byte blocks specified for error detecting and correction. Under Mode 2 there is no specified error blocks. Both modes are organized by a table of contents which is similar to a disk drive's file allocation table.
Obviously a computer program which cannot tolerate errors of any kind would require the Mode 1 standard where images or movies could. Although the later CD-ROM Extended Architecture, or CD-ROM XA adds the flexibility of mixing both modes but it hasn't become widely used because it requires special devices. As a result, most CD burning programs use Mode 1 by default. Be aware that the so called stretching of a standard CD is actually only saving as Mode 2. The perceived additional capacity is gained by eliminating the error checking and correction blocks.
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PS: source:
http://www.jhepple.com/AudioCD/data.htm
Message édité par shadow lord le 30-07-2004 à 17:01:01