These days there are only three scenarios where I see optical drive access occurring
2. Watching DVD.
The first isn't important in terms of noise since the idea with an install is to get it over and done with. The third you can control the speed of the burner in any good app. It's the second one I don't know much about, does this vary from drive to drive, or are they all smart enough to play at low speeds? Is there much of a difference in how much noise escapes each drive? Is there much of a difference between slot and tray drives?
I want a good drive, but I also want to watch films without it disturbing me.