At this point, I'd say the odds of you simply getting every bad drive out there is next to impossible. Something else is clearly wrong.
Schedule an appointment at an Apple store or some other repair shop, and tell them to run Apple Service Diagnostic on it, both the EFI and OS tests, and to do it in front of you. If they don't have a clue what you're talking about, or won't do it with you present, go somewhere else.
My personal guess on this would be you have a dodgy power inverter. It's sending way too much power to your DVD drive and keeps frying them. Actually, while you're at it, have them run the battery and power adapter diagnostic. You look to have a pretty recent model MacBook Pro, so they should have that available too, or be able to download it via Apple's GSX website.
Just make sure this is all done with you there, so if anything fails, you're a witness and they can't just give you the easy answer. It'll be about as much fun as watching paint dry, but it's necessary.
I have an MacBook Pro 2.6 MHz with 4GB 667MHz DDR2 SDRAM running 10.5.8 My DVD drive keeps going bad and Apple keeps on replacing it. Three times so far and they want to replace it a fourth time. But I am afraid that my warranty will run out and Apple won't say what they will do then. Is this computer fixable with a new drive?
I have demanded that Apple replaces my computer with a new one with no luck. Does anybody have an idea about why the drives keep on going bad, and should Apple replace this computer. Apple says that this fourth drive replacement will be a revision and should fix the problem. Again what happens when the warranty is out!