I am using a 1amp linear psu(an aqavox type) and it seems fine using that as the hdd has its own psu. Think I found out why my image of Volumio went ape. RichB had unfortunately left his spotify account details inc password on it. I deleted it and think when I switched off then on again it went pair shaped.lol. seems fine now and I have found a way to rip new albums and transfer them to the hdd connected to the pi over the network. seems to work fine so thats a big bonus.