The Seagate latest USB 3.0 portable hard drive comes with a massive 4TB of storage that can subsist entirely on USB power. It features a pair of 2.5″ laptop-sized, 2TB drives inside configured in RAID 0. The USB 3.0 connectivity allows you to realize the full speed benefits of the RAID 0 configuration with transfer speeds up to 220MB/s.
The Seagate Backup Plus Fast Portable Drive price is a very reasonable (available for $270) considering the portability, storage space and speed this unit delivers.
Now 8 TB availeble ..