I have been using wd my passport 1 tb hdd for 5-6 months and its working perfectly fine.Transfer rate of this hdd is very good above 50mbps.It has usb 3 port and also connects with mobile via otg cable.It is compact in size and looks very stylish.Have not find any problem in the device.Its great value for money product.Recommeds to all people who require 1 tb hdd.