i have 280GB HD (120GB primary & 160GB secondary) i am sad (in a way) to realise that i have left about 3.29GB in total. so i need a newd HD so i was thinking of an external HD lets about 300GB+. i want to transfer all my 280GB to it and keep it safe.Nnow here is the uncertanity..once i transfered 280GB to an external HD and keep it switched off n use it only when i need (not that often) will my data be safe at all? how likely is it a 300GB+ external HD to fail?