The File Replication Service cannot start replica set %1 on computer %2 for directory %3 because the type of volume %4 is ...

The File Replication Service cannot start replica set %1 on computer %2 for directory %3 because the type of volume %4 is not NTFS 5.0 or later. 
 
The volume's type can be found by typing "chkdsk %4". 
 
The volume can be upgraded to NTFS 5.0 or later by typing "chkntfs /E %4".