hi, i have an external harddrive (western digital 2TB), right now it's formatted as NFTS (windows) and i'd like to format it, so i'll be able to read & write, now my question is, what is the difference between all these formats and which do i choose? 1. MS-DOS (FAT) 2. Mac OS Extended (Journaled) 3. Mac OS Extended (Case-sensitive, Journaled) 4. Mac OS Extended (Case-sensitive) Thanks in advance.