diff --git a/src/tools/format.c b/src/tools/format.c
index 1f8fea1..7763c40 100644
--- a/src/tools/format.c
+++ b/src/tools/format.c
@@ -51,6 +51,7 @@
   partInfo->startSector = (startSector+1);
   partInfo->blockAllocationTable = (startSector+1);
   partInfo->rootDirectory = ((startSector+1) + (batSize/512));
+  partInfo->rootDirectorySize = 0x4000/512;
   fseek(driveFd,(startSector * 512),0);
   fwrite(partInfo,512,1,driveFd);
   startSector++;
diff --git a/src/tools/ubixfs.h b/src/tools/ubixfs.h
index 608d97f..ba8f525 100644
--- a/src/tools/ubixfs.h
+++ b/src/tools/ubixfs.h
@@ -35,6 +35,7 @@
   uLong startSector;          //Base Sector Of Partition
   uLong blockAllocationTable; //Base Sector Of BAT
   uLong rootDirectory;        //Base Sector Of Root Directory
+  uLong rootDirectorySize;    /* Size In Sectors Of Root Directory */
   };
 
 //Block Allocation Table Entry