Which portable hard drives are worth buying?

With all our computers, phones and cameras, we create a lot of data. And while there are plenty of cloud-based options for storing all the information you generate, many people prefer something they can physically touch. A portable hard drive can give you plenty of control, while still making it possible to carry your data around in your bag. But which drives make it easy to transfer files to them in the first place? And which ones will survive the trips you take them on? We've taken a look at some of the better portable drives available now to find out which ones have the right stuff.