The low-level format of a CD is defined by a standard
that everyone
follows.
Well, except for people doing copy protection. As usual. :-( (Not
that that's all that relevant to the case that started this thread,
but....)
For SCSI disk copying, it's best if the source and
destination are
the same size. For a CD, that's taken care of.
Only approximately. Consider overburning.
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