CD capacity when formatted as a flash drive

Nowhere online can I find the specs on the final amount of useable space that will be available when formatting a CD as a flash drive. I'm sure there must be a loss of space, but I wonder how much. Anyone out there hold the answer to this conundrum for me? Thanks a bunch.
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    A CD when formatted in UDF (what MS refers to as Live File System), for drag and drop use like a flash drive, uses about 150MB for the format overhead, so a 650Mb (74 minute) CD will have around 500MB of usable space.

    I think there is some discussion of that here:
  2. I figured there had to be some loss of space to account for files necessary to allow reading/writing/editing of this medium. Thanks a lot, Real, for the answer and the link!!
  3. Best answer selected by askme.
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