I just bought a new WD Caviar Green 2TB internal hard drive (Model WDBAAY0020HNC-NRSN) and installed it yesterday. Everything was running smooth once I formatted it to NTFS, and I moved about 150gb or so from my main C drive (1TB). Today, I find that it no longer shows up in My Computer, and is unformatted in Disk Management. I made sure to set the jumper correctly, so I hope I didn't just lose 150gb of stuff. Any ideas would be great. I'm running Windows 7 64bit. I can get pictures of Disk Management if it's needed.