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Since most Thinkpads feature an extracteable optical drive (it's called an Ultrabay-that drive slot), you should in fact be able to extract your main optical drive.
In general, there are 3 types of Ultrabay drives:
The older versions were simply called "Ultrabay".
These should apply to any machine around the "20's& 30's"; Ex: A21, T21..
The next were called Ultrabay Slim; fitting most last generation IBM's.
These ones were simply slimmer and fitted newer machines up to the
T42...
The latest are still called Ultrabay slim; however they have an internal specification different from the previous ones-in order to house SATA 2 drives as well (hdd's)
Remember, once you connect whatever machine to the dock; the dock's internal modules are indiferent to the originating machine's. I.e: As long as you use the dock; it doesn't matter where the optical drive came from, as long as it fits the dock.
The X6's part # is 40Y8116 and it only supports Ultrabay Slim drives; the T40 also uses Ultrabay Slim drives; therefore you shouldn't have a problem.
Problems? See this thread at archive.org.
