The specification ("Red Book", if I remember correctly) says 650 MB. Later
larger capacities (even beyond 700 MB) became available by extending the
usable surface.
If you have the hardware and software that support it, you can allow
"overburning" to use that extra surface.
I haven't watched the development. I'd assume that DVD had replaced CD, and
that Blu-Ray is about to succeed DVD.
That is a matter of how to use whatever space is available, but the question
addressed how much space is available at all.
(In my experience UDF is a waste of usable space, some 20% overhead. But it
may sometimes be useful despite this.)
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