I am using the samsung M3 1TB portable hard drive since the last 2 years, the hard disk is build by Seagate while it is branded by Samsung.Never faced a problem using this hard disk.It is a plug and play device.
The HDD is compatible with USB 3.0 so as to make the data transfer faster.The exterier of the HDD has such a design that it would not slip from our hand.It is very compact as that of a size of querty mobile phone.