from WWDC 2012 Session 709, 'What’s New in the File System'

            Mac OS X 10.8
            —————————————————————————
ExFAT       Read / Write (10.6)
FAT 16/32   Read / Write
HFS         Read Only (Deprecated)
HFS+        Journaled HFS+ everywhere
NTFS        Read Only
UDF         Read / Write