A few years ago, we had problems with an ADS hard drive. The printed instructions for attaching the ribbon cable (red line on ribbon cable closest to the power supply) were actually backwards. I don't know if that will help your issue, but attaching it correctly cleared up our problems. Also we recenty purchased a new ADS hard drive which turned out to be over eight years old and was DOA. After a few phone calls, ADS replaced it (sending back a broken case though). The older enclosures (This one had 3 firewire plug ins which ADS said indicated it was an older one vs the newer ones with 2) will only recognize 120GB drives and smaller. We never use the CD's or drivers that come with external hard drives. Lynn ................................... Producer of the upcoming eerie action thriller "Search Dog's Raven" (SearchDogsRaven.com) ...Any search can turn deadly, as a young woman and her wilderness search dog are lured down a dangerous trail...