The first 400GB drive on the market by Hitachi is compatible only with the RTV4000/4500 series. I tested it on half a dozen RTV5000 and RTV5500 units to no avail. I tried different software versions and still no-joy. However, here is a screen shot:
http://www.replaytv.us/images/407hours.jpg
http://www.replaytv.us/images/407hours.jpg
