Hi I have the same unit its a ray sharp 4 channel h264 dvr with a samsung 1TB hdd. The problem I have is that the hdd keeps coming up unformatted and shows 0hr useable. I have tried it with a 160gb samsung hdd and it seems to work fine, but the other problem is the 1TB hdd seems to format and work fine when connected to a PC. How can I resolve this issue and get it up and running asap.