I had once installed a second drive in my 13" Unibody Macbook Pro via a generic drive caddy (with built in connector adapters). Problem is, I only need the second drive when recording audio tracks in to Logic, or when booting Windows 7. I have a 64gb SSD as a system drive, and would rather not have a second mechanical drive spinning up and down when I don't really use it much. Here is an example of a loaded drive caddy. Note that there is enough room at the end of the drive where the slot in the MacBooks housing is located. This should be just enough room to place a switch of some sort. If anybody knows of a switch that might work well, please let me know. So far I am thinking of something along these lines: I will post updates to this thread & keep those interested updated on the project. If it works out well, I may even make more of these things for resale. Status 3.21.11 Since I moved my existing optical bay drive caddy to my 27" imac (for a total of 3 internal hdds), I have ordered another one today from NY. Hopefully it will arrive within a week. 3.27.11 A very functional compromise has been made. The drive is now in a macbook caddy with pull tab and can be disconnected internally with the computer powered off. Works GREAT! Thanks to Reflow for hooking it up with the macbook caddy!