In order to change the drive inside of a bracket or a caddy you need to do the following:
There are six screws you need to remove in order to take the drive out of the caddy.
There are two on the top of the drive (screws are circled in red).
Two on the right-hand side of the drive.
And two on the left.
Once these are removed, the new drive should slide out of the caddy without too much trouble.
Then all you need to do is to slide the New drive into the caddy and replace the screws. You'll need to remember which screws go where, since they are different sizes. When I was testing if I could open the DVD drive before, I put the "left" screws on the right and the drive wouldn't close properly.
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