Hi as many of you I have been wondering about if it will be possible to boot from an external SSD connected through thunderbolt. Yesterday I called apple and from a technician I got the answer that yes it should probably be possible. I also sent a letter to LaCie and asked them if their little big disk with the 2 SSD in raid would be bootable. The answer I got was yes. The one who answered me said he had a preproduction model himself that he used as a bootdrive for his iMac. I also got the same answer from a different source at lacie sales department. So this is really promising and almost no matter the cost I will buy one of these things to make my iMac fly XD.