You are not overwriting the file - you are writing a new 'session'
including the file. And each session has an overhead of about 14MB. If
the file has the same name as one previously there, then Windows will
only see the most recent version - but the old ones are still present.
So after about 35 or so such sessions the disk is full. This method of
burning CDs is not suitable for your purpose - you need one of the
'Packet Writing' UDF systems. See http://www.yqcomputer.com/
Alex Nichol MS MVP (Windows Technologies)
Bournemouth, U.K. XXXX@XXXXX.COM (remove the D8 bit)