I recently installed a new SSD drive and loaded Windows 7 from scratch. Then I installed the orig hard drive as a 2nd drive, everything seems ok, it shows there as "E:\" drive.
But when my computer goes to sleep, upon waking up the "D:\" drive (DVD) is missing . . . if I re-boot it always shows up again . . . I was inside the PC adding the new SSD drive and putting the orig HD as 2nd drive, but didn't really mess with the DVD drive / connection.
When I re-boot, the "D:\" drive is there and works fine and I've used it recently. But today again when I got home and the computer woke up, no "D:\" drive.