Virtual System can't Read Newer Discs

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I have a dual core system about 3 years old, and just installed a
virtual system using virtualbox software, to establish now Host and
Guest virtual systems. Host is running Windows 7 64bit . Guest is
running Windows XP 32bit to be able to run old programs and old disks,
BUT the guest will NOT access newer discs while the host has no
problems with the same disks and the same drive. What could possibly
be causing this?! Did a similar post awhile ago bot got no useable
response so here again and sorry for the trouble.

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