exFAT
Main article: exFAT
exFAT is an incompatible replacement for FAT file systems that was introduced with Windows Embedded CE 6.0. It is intended to be used on flash drives, where FAT is used today. Windows XP file system drivers will be offered by Microsoft shortly after the release of Windows CE 6.0[citation needed], while Windows Vista Service Pack 1 added exFAT support to Windows Vista.[21] exFAT introduces a free space bitmap allowing faster space allocation and faster deletes, support for files up to 264 bytes, larger cluster sizes (up to 32 MB in the first implementation), an extensible directory structure and name hashes for filenames for faster comparisons. It does not have short 8.3 filenames anymore. It does not appear to have security access control lists or file system journaling like NTFS, though device manufacturers can choose to implement simplified support for transactions (backup file allocation table used for the write operations, primary FAT for storing last known good allocation table).
http://en.wikipedia.org/wiki/File_Allocation_Table