I have an external drive with 4 partitions. One of the partitions is 400GB, but it shows as 63GB being used. There are no files visible on the drive, I have the view hidden files option checked, so they are not hidden by windows. I have 2 external drives, this is the 2nd one I installed, and the partition is the last one on the drive. It is the Seagate GoFlex 2 terabyte drive, and it asked me to back up my operating system, but i canceled it, so I cant believe that it would have been able to back up 63GB in that short amount of time that it attempted to do the backup. What I need to know is if it is safe to reformat the drive to recover that space. I just wanted to be sure there would be no critical files windows would have put there (I have a total of 13 partitions on 3 drives - 2 of them external drives), so i cant image that windows would have put any data there. Is it safe to format that drive, or is it safer to delete the volume and recreate it? I can do it via the computer management screen.