I've got a couple of CD-R v7.2 sets, and
haven't had a problem booting
from them on my RRD42. But Roxio, on my Spousal Equivalent's Windows
box, hurled trying to dupe the original. I used dd.
I believe Roxio (EZ CD Creator, as was) insists that
the initial 64 (?) blocks (which ISO9660 deliberately
leaves undefined) must be zero (or some fixed values)
and gets upset when they are not.
Almost anything else will happily blindly copy
a CD even if it cannot interpret the contents
(e.g. Gear and CDR-Win both seem fine with
creating OpenVMS CDs).
Antonio