I can't see the benefit of buying an pre-built external HDD given the inflexibility (unless you pay otherwise!) and uncertainty over what you get. Few questions though: 1) Enclosure - read on here not to spend over £5-10 as they all do the same job. In that case, is this one ok? looks to have all the connectivity I need (don't have USB 3.0). 2) HDD - Am I right in thinking 2.5" drives don't need dedicated power (i.e. they'll run off USB or eSATA?) but 3.5" do? If I'm looking for 1TB+ what's my best option at the moment (<£70). 3) Will this set up be as robust as some of the prebuilt ones in the market?