Roland- Correction- You can install from the $29 disk but I don't believe you can "boot" from it. It appears to be a technicality. Stick a blank new HD in a Mac Book Pro and you can install Leopard Snow from the $29 disk. I've done it. BUT, put the same disk in a Dell with same hardware but different Bios and instruct the Dell to boot from the DVD and it just sits there and eventually says there is no bootable device. However, use one of the modified bootable OS X disks and the Dell will boot from it. Therefore, it doesn't appear that you can use the $29 disk to install Leopard Snow on anything but a Mac.