After reading through last night, I ordered the lesser version of the Samsung - the 500 Gb. I'd never need 1TB and got this on that basis that sometimes Less is More. i.e. a smaller drive might be more reliable. However, I don't know, but at 35.99 with free post, it can be one of those that lives up the road and has no great demand on its performance.
What I really want is a drive that's a notch or two up in reliability. Two drives in fact - one for the PC and one that has USB portability. However, it seems there's an exponential increase in cost for such items. Any comments?