diff --git a/include/fs.h b/include/fs.h
index d925d3c..ac2f4c6 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -21,7 +21,7 @@
 #include "types.h"
 #include "fatfs/ff.h"
 
-
+#define FS_MAX_DEVICES  (2)
 #define FS_MAX_DRIVES   (FF_VOLUMES)
 #define FS_DRIVE_NAMES  FF_VOLUME_STRS
 
@@ -32,6 +32,12 @@
 
 typedef enum
 {
+	FS_DEVICE_SDMC = 0,
+	FS_DEVICE_NAND = 1
+} FsDevice;
+
+typedef enum
+{
 	FS_DRIVE_SDMC = 0,
 	FS_DRIVE_TWLN = 1,
 	FS_DRIVE_TWLP = 2,
@@ -51,11 +57,14 @@
 
 typedef FILINFO FsFileInfo;
 
+typedef s32 DevHandle;
 
 
 s32 fMount(FsDrive drive);
 s32 fUnmount(FsDrive drive);
 s32 fGetFree(FsDrive drive, u64 *size);
+s32 fPrepareRawAccess(FsDevice dev);
+s32 fFinalizeRawAccess(DevHandle handle);
 s32 fOpen(const char *const path, FsOpenMode mode);
 s32 fRead(s32 handle, void *const buf, u32 size);
 s32 fWrite(s32 handle, const void *const buf, u32 size);
diff --git a/source/arm9/fs.c b/source/arm9/fs.c
index fb57749..71ca67f 100644
--- a/source/arm9/fs.c
+++ b/source/arm9/fs.c
@@ -16,6 +16,7 @@
  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <string.h>
 #include "types.h"
 #include "fs.h"
 #include "fatfs/ff.h"
@@ -33,6 +34,8 @@
 static bool dStatTable[FS_MAX_DIRS] = {0};
 static u32 dHandles = 0;
 
+static bool devStatTable[FS_MAX_DEVICES] = {0};
+static bool fsStatBackupTable[FS_MAX_DRIVES] = {0};
 
 
 s32 fMount(FsDrive drive)
@@ -79,6 +82,49 @@
 	else return -res;
 }
 
+s32 fPrepareRawAccess(FsDevice dev)
+{
+	if((u32)dev >= FS_MAX_DEVICES) return -30;
+	if(devStatTable[dev]) return -31;
+	
+	if(dev != FS_DEVICE_NAND)
+		return -31;
+	
+	memcpy(fsStatBackupTable, fsStatTable, sizeof(fsStatTable));
+	
+	switch(dev)
+	{
+		case FS_DEVICE_SDMC:
+			fUnmount(FS_DRIVE_SDMC);
+			break;
+		case FS_DEVICE_NAND:
+			fUnmount(FS_DRIVE_TWLN);
+			fUnmount(FS_DRIVE_TWLP);
+			fUnmount(FS_DRIVE_NAND);
+			break;
+		default:
+			return -30; //panic();
+	}
+	
+	devStatTable[dev] = true;
+	
+	return FR_OK;
+}
+
+s32 fFinalizeRawAccess(DevHandle handle)
+{
+	if(handle != FR_OK) return -30;
+	if(!devStatTable[FS_DEVICE_NAND]) return -31;
+	
+	for(u32 drive = 0; drive < FS_MAX_DRIVES; drive++)
+	{
+		if(fsStatBackupTable[drive])
+			fMount(drive);
+	}
+	
+	return FR_OK;
+}
+
 static s32 findUnusedFileSlot(void)
 {
 	if(fHandles >= FS_MAX_FILES) return -1;
@@ -285,3 +331,5 @@
 	if(res == FR_OK) return res;
 	else return -res;
 }
+
+