The model number is WD10EZEX. So I just recently built my computer, and loaded Windows 8.1 onto my boot drive (my SSD.) I used my SSD (Crucial MX100 128GB's) for a few days as my main drive, but now I need more storage,. I had noticed it wasnt working when I first built the computer a few days ago but I really didn't feel like messing with it then, because my SSD was working. When I go into my bios, I can see the hard drive, after i'm in Windows 8.1 though, I can't see it in "This Pc" or in Disk Manager. I have been surfing the internet looking for a good solution, and realized a few others seem to be having a similar problem, but I can't really find a solution. Any help would be greatly appreciated. Thanks.