diff --git a/Fat.h b/Fat.h
index e02d88c..19614d1 100644
--- a/Fat.h
+++ b/Fat.h
@@ -26,7 +26,10 @@
                        bool ro, bool remount, bool executable,
                        int ownerUid, int ownerGid, int permMask,
                        bool createLost);
-    static int format(const char *fsPath, unsigned int numSectors);
+    static int format(const char *fsPath, unsigned int numSectors, bool wipe);
+
+private:
+    static void wipe(const char *fsPath, unsigned int numSectors);
 };
 
 #endif