How long do CD-Rs and CD-RWs last?page up: CD-Recordable FAQnext page: 7-7] Is it okay to write on or stick a label on a disc?

(2004/04/15) There are 21-minute (80mm/3-inch), 74-minute, 80-minute, 90-minute, and 99-minute CD-Rs. These translate into data storage capacities of 184MB, 650MB, 700MB, 790MB, and 870MB respectively (see below for exact figures). See section (7-14) for more about 80mm CD-Rs, and sections (3-8-1) and (3-8-2) for notes on 80-, 90-, and 99-minute blanks.

There used to be 63-minute CD-Rs, but these have largely vanished. Typical 74-minute CD-Rs are advertised as holding 650MB, 680MB, or even 700MB of data. The reality is that they're all about the same size, and while you may get as much as an extra minute or two depending on the exact construction, you're not usually going to get an extra 30MB out of a disc labeled as 74-minute media.

See section (3-8-3) for information on writing beyond a disc's stated capacity. Folks interested in "doing the math" should note that only 2048 bytes of each 2352-byte sector is used for data on typical (Mode 1) discs. The rest is used for error ... more.

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