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For £50 for a 1TB hard drive, you can't really expect much in design.
If you want an external hard drive that you want to be able to take everywhere with you, this is not the product you are looking for. I'd suggest paying more for the tiny hard drives, as this bulk of plastic isn't very portable.
The hard drive does not have it's own on/off switch, so you have to plug it in and unplug in when you want it on or off, as it can overheat.
The internal parts work perfectly. As soon as you plug it into the usb, it's ready to go and shows all of the files straight away. Sometimes other hard drives can take a short while to load the files. It has worked with several windows pcs and laptops, macs and macbooks, ps3, xbox 360 and many tv sets.
The outer case isn't very strong, but it shouldn't be dropped anyway. It fell from a cabinet around 2ft from the ground, and one side cracked open. It somehow fixed itself by falling back into place after I left it on its side for a few hours.
This hard drive is definitely for sitting next to the tv or games console, holding films. It isn't portable as the outside is weak and bulky.
I'd give it a 3/5 as the design is inferior to other products, but it is cheap and works perfectly.