The buffalo NAS is a very unreliable drive. Check the reviews on Amazon,there's almost as many 1 point reviews a there good ones. I owned a different version of this and it died before just after the warranty ran out. The hard drive inside was unrecoverable and Buffalo wouldn't even sell me a replacement hard drive to put in the NAS. You can't put any generic hard drive in these as they have a proprietary format they use. There answer is sorry, just buy a whole new unit! Oh if you want to try and have your data recovered it can cost $2000.00!