I have a 500 GB WD My Book external USB hard drive that I have used with a Vista computer for a couple years. I just got my first Mac (Mac Mini) and want to back it up so I can then upgrade my Mac Mini hard drive and transfer back all the files. I feed up space on my external drive hoping that I could use Time Machine or the Disk Utility to back up and image onto the external drive. However, it's not letting me. I'm assuming it's because my external drive has an NTFS partition on it, but it also has about 60 GB unused that I can't seem to format from my Mac Mini either. Is there any way around this? I definitely don't want to wipe the entire external drive and set up new partitions via the Mac. I can't seem to find an "easy" solution that will let me use this external drive to store the backup image at the moment. Thanks in advance for your help!