After removing the front plate, the sliding drawer of the Lite-On DVD-RW drive comes out too low and scrapes the bottom of the mac pro's drive opening, getting stuck about a quarter of its length. I tried adjusting to no avail. So I had to switch the new drive up to the higher bay in order for it to open reasonably well. I picked this drive because of the recommendation given on the Accelerate Your Macintosh! web page. Just letting everyone know that it takes some fiddling.