A disc that would be able to hold dual formats would be a pain in the butt at the moment until the machines can tell the difference. If you want to see an example of the bad this can cause, take a HD-DVD and put it into a Pioneer Blu Ray player. It will do bad things to this machine. Of course the Pio is a super picky unit anyway. Bring along a paperclip for your test, because it won't want to give the HD-DVD disc back and you will need to manually eject it.
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A disc that would be able to hold dual formats would be a pain in the butt at the moment until the machines can tell the difference. If you want to see an example of the bad this can cause, take a HD-DVD and put it into a Pioneer Blu Ray player. It will do bad things to this machine. Of course the Pio is a super picky unit anyway. Bring along a paperclip for your test, because it won't want to give the HD-DVD disc back and you will need to manually eject it.