The MFT Zone is a chunk of free space immediately following the $MFT.
MFT Zone is reserved for potential MFT growth.
Once free space in the original $MFT file is used up, the MFT Zone is divided in half.
New file records are created in the bottom half (not near the original $MFT.)
If the entire MFT Zone is used up and the MFT still has to grow, then the $MFT file becomes fragmented.
A fragmented $MFT file cannot be defragmented.
