Hi, I have a genuine question I hope someone could answer. I have 10 Mac Pro's. Can I use any one of the installation disks in any of the Mac Pro's if I need to erase and re-install or is each disk specific to the machine it came with? Basically, do I need to keep all 10 discs, or can I just keep one and a backup and destroy the rest? Ideally I would like Apple to clear this one up for me but I've tried Geniuses and Applecare and they seemed pretty unsure... Any help appreciated!