I am usingg windows 7. I have had since it first cam out and have had no problems. I am a DJ in the area and I have 2 hard drives. Two Western Didgital 650 SATA drive hooked to my tower. My OS is on C while F and G are two partions that have my downloads and my MP3’s. G is where my Mp3’s are located. This started about 3 weeks ago, I noticed that from “My computer” that it showed jusy Drive “C”. I didn’t know if it went bad or not. A few days later, the drive returned. Then a few days later it was gone again.. This has happened to me about 6 times, the hard drive there and the disapearing.Ant suggestions on what I can do? I have tried to add hardware, and a device, restore and nothing seems to work for me for lack of knowledge. Any and all suggestion would be great. Thanks.