I am having difficulty formatting a 1TB drive in a USB enclosure (tried two different brands). There is no problem when there is only one partition of 1TB, but 3 smaller partitions are absolutely necessary since this is a backup drive for other drives. There was no problem with 500GB USB drives. Have you any ideas, or is it just some weird compatibility issue with the specific drive? I hate to throw out the drive because it is only one day old, but some data was stored on it before trying to reformat. Therefore it cannot be returned because there is no time for a wipe in the next few hours. Thanks.