Thanks for the explanation....

I always assumed it was some sort of copy protection like CloneCD or something that was preventing the disks from being "bootable".

What about PS2 CD's? Does the same protection technique apply to them as well? I have a couple of disks that are blue cd-rom's rather than DVD's.

Thanks again!

Yes... It doesn't matter if they are dvds or cds.... The same applies to all....