I can understand the advantages of adding the "Unmount.reg" to the registry to allow the easy copying. Adding "Unmount.reg" is a permanent change; what are the disadvantages to making this permanent chagnge? After I set up my computer this way, Acronis True Image can't find the hard drives/partitions in my computer when I try to run it. Are we supposed to change the registry back to its state before adding "Unmount.reg" after each copy of the system? Thanks!