My hard drive isn't being detected?

kikokyle

Honorable
Jun 19, 2012
23
0
10,510
Normally using my computer. Shut it off, go to work. When I come home and turn it on, it tells me that I have to like boot from my disk or something. After troubleshooting, I eventually install Windows on my second hard drive. Finally am able to use Windows, and when I do, I look in "Computer" under "Start" and my original, primary hard drive isn't there, just my second hard drive with Steam on it and the new installation of Windows.
Help?

Win 7 64 bit
Both drives are Hitachi HDS721050DLE630 500 GB's