I just bought a Buffalo External 2TB Hard Drive to act as the Time Machine backup for my mac. (See here: http://www.amazon.com/Buffalo-Techn...4?ie=UTF8&s=electronics&qid=1306046618&sr=8-4) However, I am confused as to which file format I need to format the disk under. I have done a search but there seems to be conflicting advice. I am running 10.6.7 so I have the ExFAT option as well. Do I need to choose: ExFAT, Mac OS Extended (Jounaled), Mac OS Extended (Case Sensitive, Jounaled) or Mac OS Extended? Also in disk utility I have the option to format two "levels" of the same drive. Which do I need to format? (See attached image, there is the 2TB Buffalo External HDD Media and the HD-LBU2 - not sure which I should format). Any help would be much appreciated.