I haven't used it yet, but no doubt will use one if not bot features. I have one Vista PC with my other two running XP. I now completely understand both Mastered and the Live File System as you explained it very well.It's cool technology and it leaves you with a tough decision: Do ya risk it with Masterred(my choice) not being able to format or edit the dics content while being able to port the disk to different OSs. Or go with LFS not bein' able to port anything. Very cool, thanks for letting me in on it man.