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CD-ROM
 "CD-ROM" (the acronym for "Compact Disk Read Only Memory") is the designation for the storage media derived from audio CDs introduced by Philips and Sony in 1985.
The CD-ROM specifications were set forth in the so-called "Yellow Book", a book which is in fact yellow.
CD-ROMs originally used only 2,048 bytes (Mode 1) or 2,336 bytes (Mode 2) of the 2,352 bytes per sector used by CDs for audio data because additional error correction information had to be stored. This resulted in a total storage capacity of 682 MB (Mode 1).
The expansion to the CD-ROM/XA standard, based on the CD-I specifications, introduced two new formats with 2,024 bytes (Form 1) or 2,324 bytes (Form 2) per sector.
These sector types can be interleaved with one another on a CD in order to combine program data and audio or video data with fewer errors.
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