Seagate's new Expansion offers the same storage that the Expansion Fast offers, it is a single hard drive instead of two external drives in a RAID 0 configuration. It's also got more storage, allowing Seagate's newest offering to fill a void between the other drives in the Expansion family. Design wise, the hard drive looks like any standard 2.5-inch portable hard drive. It measures in at 4.5 inches in length, 3.1 inches in width, it's .807 inches thick (20.5mm), and it weighs 0.54 pounds. In terms of usability, those dimensions mean it's slim and easy to slip into a bag or a backpack.The Backup Plus has a traditional black casing that's half metal and half plastic, with the metal plate located on the front of the drive. An LED on the front lights up when the hard drive is plugged in, and there's a single USB port on one side.There's a large but subtle Seagate logo on the back and another small logo in silver on the front.It is USB 2.0/3.0 only and ships with an 18-inch USB 3.0 cable, which is an adequate length for use on a desktop or while on the go.