hi, i purchased an xbox 360 arcade version brand new just before xmas which comes with the 256mb memory card which is almost full. i then went and purchased a HDD as i've started playing online, but the HDD did not work and the xbox doesnt recognise it in the memory settings, i tried various things suggested to get it to work but still no joy and sent it back as i thought it was faulty. i then go and buy another from somewhere else, guess what....still dont ******* work? Can anyone tell me is there something i should be doing that i perhaps have not done already? many thanks in advance.