I completed the cloning process via a master / slave option for a new hard drive, all seem to go fine. Now when I swap the HD, the new cloned drive can not detect the operating system. I am running Microsoft Windows XP Media center edition version 2002 service pack 2 The new hard drive is a Seagate barracuda 250GB. I can see all the cloned files if I leave the drive set up as master / slave, as ther were when I cloned the new drive. Any Ideas on why this is occuring?