Seagate Expansion 2TB USB 3.0 Portable External Hard Drive for $75.62 shipped. Here is a screenshot for your reference. This portable hard drive uses USB 3.0 interface for much faster data transfer rate. It is portable and convenient as it is powered through USB with no AC adapter necessary. It is worth noting that at the time of this post, 98% of customer reviews have given it 4/5 and 5/5 stars, which is rather unusual.