http://blogs.msdn.com/windowsvistanow/archive/2009/06/22/default-file-formats-for-usb-removable-media.aspxIf the drive is removable, supports hot swap, and the disk size is less than or equal to 32GB, then the default is the FAT file system. If its size is less than or equal to 2GB, then the default is FAT, otherwise the default is FAT32. If the disk sizeen-USCommunityServer 2.1 SP1 (Build: 61025.2)