Index: fat.c
===================================================================
--- fat.c.orig
+++ fat.c
@@ -705,6 +705,7 @@ static int fat_32_read(Fs_t *This, union
 
 
 static int old_fat_read(Fs_t *This, union bootsector *boot, 
+                        int config_fat_bits,
 			size_t tot_sectors, int nodups)
 {
 	This->writeAllFats = 1;
@@ -719,7 +720,7 @@ static int old_fat_read(Fs_t *This, unio
 	if(check_media_type(This,boot, tot_sectors))
 		return -1;
 
-	if(This->num_clus >= FAT12) {
+	if(This->num_clus >= FAT12 || config_fat_bits == 16) {
 		set_fat16(This);
 		/* third FAT byte must be 0xff */
 		if(!mtools_skip_check && readByte(This, 3) != 0xff)
@@ -735,6 +736,7 @@ static int old_fat_read(Fs_t *This, unio
  * structures.
  */
 int fat_read(Fs_t *This, union bootsector *boot,
+             int fat_bits,
 	   size_t tot_sectors, int nodups)
 {
 	This->fat_error = 0;
@@ -745,7 +747,7 @@ int fat_read(Fs_t *This, union bootsecto
 	This->lastFatSectorData = 0;
 
 	if(This->fat_len)
-		return old_fat_read(This, boot, tot_sectors, nodups);
+		return old_fat_read(This, boot, fat_bits, tot_sectors, nodups);
 	else
 		return fat_32_read(This, boot, tot_sectors);
 }
Index: init.c
===================================================================
--- init.c.orig
+++ init.c
@@ -387,7 +387,7 @@ Stream_t *fs_init(char drive, int mode,
 	}
 
 	/* read the FAT sectors */
-	if(fat_read(This, &boot, tot_sectors, dev.use_2m&0x7f)){
+	if(fat_read(This, &boot, dev.fat_bits, tot_sectors, dev.use_2m&0x7f)){
 		This->num_fat = 1;
 		FREE(&This->Next);
 		Free(This->Next);
Index: fsP.h
===================================================================
--- fsP.h.orig
+++ fsP.h
@@ -92,6 +92,7 @@ void fatAllocate(Fs_t *This, unsigned in
 void fatEncode(Fs_t *This, unsigned int pos, unsigned int value);
 
 int fat_read(Fs_t *This, union bootsector *boot,
+                         int fat_bits,
 			 size_t tot_sectors, int nodups);
 void fat_write(Fs_t *This);
 int zero_fat(Fs_t *Fs, int media_descriptor);