Added another hard drive in to my server this morning.
Also moved it in to the cupboard so I can't hear it and my PC has been moved from on top of my desk to where the server was to the side of the desk and now I can hardly hear it. Amazing what 1.5m difference can do to sound.
It is Windows Home Server which is based on Windows Server 2003 which is essentially XP in server form. I hope Microsoft do make a Windows 7 Home Server, this one is really good.