I want my iTunes Library to be accessible by iTunes on both Windows 7 and OSX Lion - both on my Mac mini. It looks like the best option is to store the library on an external drive. It looks like I will have to format the drive to read/write from both formats. My current external drive is NTFS, so it won't work. Are most external drives able to be formatted before using. Do people recommend Fat32 or exFat when trying to use on both platforms?