I brought wd passport ulta external hardisk for store official documents, games , movies , songs and more. wd passport ultra provides ultra safty to important document. Easy to use. It is competable with with window xp, 7, 8, 10 and all. I’m using wd passport ultra from last 2 years. wd passport ultra provide inbuild security and password facility to your data. it is smaller in size and easy to carry in pocket. We can this hard disk in smartphone through OTG cable 3.0. I m using this hard disk from years. I suggest every should use this hard disk.