Zebu

I currently have a rebranded dahua based 16-channel DVR. It was working fine until almost a month ago. I had a 500GB Seagate Barracuda hooked up with the DVR and it suddenly got corrupt or whatever I don't know. But it stopped recording any of the video feed. I didn't really know much about this stuff and so before getting a brand new hard drive I tried hooking up another notebook hard drive up with the DVR to see if it works. That worked... only for a while. Now it says that drive is full and I can't reformat it. So, I got rid of that and got another hard drive, WD AV-GP 1TB. It should've worked but when I hooked up all the cables it doesn't even recognize the hard drive. When I try to format it, it doesn't show up on the drop down menu where the list of hard drives connected should be. I even got a new SATA cable, thought it might be a transfer issue but still doesn't work. I might try replacing the SATA power cable, but I don't know if that would work. I was hoping anyone here could help out tell me what the problem might be. Is it something wrong with the DVR altogether?

I just checked the power supply and it's a 12v 3.33a, is this a problem? If so, how come the dvr was working perfectly fine for months?

Hmm, I'm not too sure about the power supply part, I will check it later though. There has never been a problem with the power supply of the DVR. I have never seen it shut it self off or anything. Anything else that could cause problems with HDDs?