Hi, I have a 160Gb Intel X25-M (G2) SSD in my 13" Unibody. It's got plenty of room, but I can't get everything on there! As I'm constantly shuttling movies & TV shows between my Macbook and an external drive, I've ordered an MCE Optibay with external enclosure for the Superdrive it will replace. I've also ordered a 500Gb WD Scorpio Blue to go inside the Macbook, but I have a few questions regarding the sudden motion sensor and also booting: 1) As far as I can tell the Scorpio Blue has no sudden motion sensor. The Scorpio Black has one, but I don't really want the power drain/vibration/noise of a 7200rpm drive which is only used for additional storage. Is this the case? 2) If so, is this even relevant? Is the Sudden Motion Sensor in the Unibody something built in, or was it a feature of the stock drive? I found this: http://www.mac-forums.com/forums/ap...harddrive-unibody-macbook-motion-sensors.html Quote: "On a Western Digital, you do not want the free-sensor. HD Motion sensors (the ones present inside a hdd) conflict with the Macbooks Sudden Motion Sensor, therefore causing problems." Is this correct? 3) If this is the case, should my strategy be to put the Scorpio Blue in the 'proper' HD bay, and the SSD in the Optibay? (Thereby gaining SMS protection for the HDD, which isn't needed for the SSD). 4) Would this setup present any problems with booting from the SSD? Thanks for reading - I'm researching this myself, but I still have a window of opportunity to cancel the Scorpio Blue order and go for a Scorpio Black, so I'm hoping for a quick answer!