Correct me if I'm wrong but the second you use windows explorer to copy the files from the disc it can no longer be "forensic copy", because the 32kb padding(if any to begin with) goes out the window. On another note you can't tell what order the files were in to begin with, so how can you be sure they are going back in that same order. Doing it that way can only assure each individual "file" is bit accurate, not the disc as a whole. If you don't let Imgburn do it's thing you may very well "break" a disc that would normally be playable for the sake of your checksums working out. Why not just create, burn, verify an image?