>> I would guess it would be incredibly hard to make a "disk" virus >> that would work on greatly differing OS's like Linux AND Windows.
This is actually a good reason to encrypt your whole disk. The disk can't serve up working malware if the bits it returns get mangled by decryption with an unknown(-to-the-disk) key before being used. Of course, this will generally mean booting off something other than the disk in question; that thing then becomes a possible target for attack. But this can be made more or less arbitrarily hard for the attacker - consider network booting from a bootserver that isn't even running the same ISA as the client.... /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mo...@rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B