Why use this drive at all?
Here is what I always did since i have an iMac: as we all know that the temperature inside those iMacs can get a little hot, I decided to always use an external DVD-R drive, to keep things cooler inside the iMac. (You can get a good one for quite cheap these days!) Also repairing the iMac internal drive is a costlier undertaking than merely replacing an external drive. I think I used my internal drive once or twice mostly to see if it was working! Just my two cents...