Normalised 80Mn CD-Rom holds 360000 sectors of 2048 bytes
ie: 737 280 000 bytes = 703.125MB
All 80mn CD should handle 703MB but some can stand a bit more. It depends on the real capacity of the media itself, and the ability of your CD writer and burning software to support overburning.
It would really be a shame to split the remaining kB on a second CD.
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