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Why can I only fit 700MB on a disc that claims to be 730MB?

This comes down to the difference in a binary numbering system and decimal numbering system.

Simply put 1MB is not actually 1,000,000 bytes

  • One Kilobyte is 1024 bytes, and one Megabyte is 1024 kilobytes
  • Therefore one Megabyte is 1024 x 1024 bytes = 1,048,576 bytes
  • If you then store 700MB on a CD, you are actually storing 700 x 1,048,576 bytes, which equals 734,003,200 bytes

A little bit is generally used for storing the locations of the info and trying to make the discs as compatible as possible so you end up with around 730MB's.

Link:
www.medea.co.uk/techsupport/index.php?action=kb&print=3


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