I am using a Toshiba Satellia M40-JM3. I've had this problem for a while, even took it into Future Shop and the gorons there claimed they fixed it after holding onto it for 10 days when they did nothing at all. The laptop is only a month old and the DVD drive decides it doesn't exist fairly often. Usually if I boot the computer with a cd then the drive shows up. The drive also sometimes disappears in the middle of using the computer, usually after coming out of hibernation, even with a cd in it. Trying to search for new devices in device manager doesn't detect it after it's gone, neither does the add hardware in the control panel. I've been looking all over to try to figure out how to fix it myself, i could use some help.