I have two WD 80 GB drives. The first one is the boot disk and the second one is a clone of the first one I made with the Acronis True Image CD. When I attempt to add the second disk to the system, Windows BSODs - "Unaccessible Boot Device". If I remove the second cloned disk then Windows boots properly. Sometimes I manage to get past the BSDO and get into Windows, and the second drive is partly mounted but it does not have a drive letter assigned. When I attempt to assign a drive letter I get an error message claiming that the partition/volume is not "enabled". If, however, I take the clone disk and use it immediately as the boot disk, it boots properly. I then shut down and add the first disk keeping the second as the boot disk. Now Windows mounts the second disk properly. If I swap the disks back to the original configuration, Windows now mounts the second clone disk properly. I do not have this problem is I use a different model WD disk as the second disk. I can mount it immediately using the first disk as the boot disk. Somehow the fact that the two 80 GB disks are the same model is causing a mounting problem when I try to mount them together right after cloning. If, however, I use the clone to boot, Windows does something to the disk that causes it not to BSOD. Can you tell me what the problem is using two of the same model disk in the cloning procedure and how to fix it other than the method I discovered by trial and error.