diff --git a/source/draw.c b/source/draw.c
index 5278adb..3dba04d 100644
--- a/source/draw.c
+++ b/source/draw.c
@@ -114,6 +114,9 @@ void Screenshot(const char* path)
     };
     static u32 n = 0;
     
+    if (!CheckFS()) // not mounted, nothing to do
+        return;
+    
     if (path == NULL) {
         for (; n < 1000; n++) {
             char filename[16];
diff --git a/source/emunand9.c b/source/emunand9.c
index fb8b96d..af3b0ce 100644
--- a/source/emunand9.c
+++ b/source/emunand9.c
@@ -227,7 +227,12 @@ u32 FormatSdCard(u32 param)
     u32 fat_size_sectors   = 0;
     
     // copy starter.bin to memory for autosetup
-    if (starter_size && FileOpen("starter.bin")) {
+    if (starter_size && !CheckFS()) {
+        Debug("File system is corrupt or unknown");
+        Debug("Continuing without starter.bin...");
+        Debug("");
+        starter_size = 0;
+    } else if (starter_size && FileOpen("starter.bin")) {
         Debug("Copying starter.bin to memory...");
         starter_size = FileGetSize();
         if (starter_size > ((u32)(FCRAM_END - buffer))) {
@@ -237,6 +242,7 @@ u32 FormatSdCard(u32 param)
         } else if (starter_size > MAX_STARTER_SIZE) {
             Debug("File is %ikB (recom. max: %ikB)", starter_size / 1024, MAX_STARTER_SIZE / 1024);
             Debug("This could be too big. Still continue?");
+            Debug("(A to continue, B to cancel)");
             while (true) {
                 u32 pad_state = InputWait();
                 if (pad_state & BUTTON_A) break;
@@ -291,7 +297,11 @@ u32 FormatSdCard(u32 param)
     
     // this is the point of no return
     Debug("Total SD card size: %lluMB", ((u64) sd_size_sectors * 0x200) / (1024 * 1024));
-    Debug("Storage: %lluMB free / %lluMB total", RemainingStorageSpace() / (1024*1024), TotalStorageSpace() / (1024*1024));
+    if (CheckFS()) {
+        Debug("Storage: %lluMB free / %lluMB total", RemainingStorageSpace() / (1024*1024), TotalStorageSpace() / (1024*1024));
+    } else {
+        Debug("Unknown or corrupt file system");
+    }
     switch(CheckEmuNand()) {
         case RES_EMUNAND_READY:
             Debug("Already formatted for EmuNAND");
@@ -354,6 +364,14 @@ u32 FormatSdCard(u32 param)
     DeinitFS();
     InitFS();
     
+    // check if it went well
+    if (!CheckFS()) {
+        Debug("Unknown error / something went wrong here");
+        Debug("Format this SD card from your PC first");
+        Debug("Then try this again");
+        return 1;
+    }
+    
     // try creating the working directory
     #ifdef WORK_DIR
     DirMake(WORK_DIR);
diff --git a/source/fs.c b/source/fs.c
index 1c736aa..bb98833 100644
--- a/source/fs.c
+++ b/source/fs.c
@@ -38,6 +38,11 @@ void DeinitFS()
     f_mount(NULL, "0:", 1);
 }
 
+bool CheckFS()
+{
+    return fs_ok;
+}
+
 bool FileOpen(const char* path)
 {
     if (!fs_ok)
diff --git a/source/fs.h b/source/fs.h
index 5ea387c..34516d8 100644
--- a/source/fs.h
+++ b/source/fs.h
@@ -4,6 +4,7 @@
 
 bool InitFS();
 void DeinitFS();
+bool CheckFS();
 
 /** Opens existing files */
 bool FileOpen(const char* path);
diff --git a/source/menu.c b/source/menu.c
index 752acac..ca16228 100644
--- a/source/menu.c
+++ b/source/menu.c
@@ -24,9 +24,10 @@ u32 UnmountSd()
     Debug("(B to return, START to reboot)");
     while (true) {
         pad_state = InputWait();
-        if (((pad_state & BUTTON_B) && InitFS()) || (pad_state & BUTTON_START))
+        if (pad_state & (BUTTON_B | BUTTON_START))
             break;
     }
+    InitFS();
     
     return pad_state;
 }
@@ -48,7 +49,11 @@ void DrawMenu(MenuInfo* currMenu, u32 index, bool fullDraw, bool subMenu)
         DrawStringF(menublock_x0, menublock_y1 + 10, top_screen, (subMenu) ? "A: Choose  B: Return" : "A: Choose");
         DrawStringF(menublock_x0, menublock_y1 + 20, top_screen, "SELECT: Unmount SD");
         DrawStringF(menublock_x0, menublock_y1 + 30, top_screen, "START:  Reboot");
-        DrawStringF(menublock_x1, SCREEN_HEIGHT - 20, top_screen, "SD storage: %lluMB / %lluMB", RemainingStorageSpace() / (1024*1024), TotalStorageSpace() / (1024*1024));
+        if (CheckFS()) {
+            DrawStringF(menublock_x1, SCREEN_HEIGHT - 20, top_screen, "SD storage: %lluMB / %lluMB", RemainingStorageSpace() / (1024*1024), TotalStorageSpace() / (1024*1024));
+        } else {
+            DrawStringF(menublock_x1, SCREEN_HEIGHT - 20, top_screen, "SD storage: unknown filesystem");
+        }
         DrawStringF(menublock_x1, SCREEN_HEIGHT - 30, top_screen, "EmuNAND: %s",
             (emunand_state == RES_EMUNAND_READY) ? "SD is ready" :
             (emunand_state == RES_EMUNAND_GATEWAY) ? "GW EmuNAND" : 
diff --git a/source/theme.c b/source/theme.c
index e5732d2..03aaab4 100644
--- a/source/theme.c
+++ b/source/theme.c
@@ -38,8 +38,12 @@ void LoadThemeGfxLogo(void) {
     u32 emunand_state = CheckEmuNand();
     LoadThemeGfx(GFX_LOGO, LOGO_TOP);
     #if defined LOGO_TEXT_X && defined LOGO_TEXT_Y
-    DrawStringF(LOGO_TEXT_X, LOGO_TEXT_Y -  0, LOGO_TOP, "SD storage: %lluMB / %lluMB", RemainingStorageSpace() / (1024*1024), TotalStorageSpace() / (1024*1024));
-    DrawStringF(LOGO_TEXT_X, LOGO_TEXT_Y -  0, LOGO_TOP, "EmuNAND: %s",
+    if (CheckFS()) {
+        DrawStringF(LOGO_TEXT_X, LOGO_TEXT_Y -  0, LOGO_TOP, "SD storage: %lluMB / %lluMB", RemainingStorageSpace() / (1024*1024), TotalStorageSpace() / (1024*1024));
+    } else {
+        DrawStringF(LOGO_TEXT_X, LOGO_TEXT_Y -  0, LOGO_TOP, "SD storage: unknown filesystem");
+    }
+    DrawStringF(LOGO_TEXT_X, LOGO_TEXT_Y - 10, LOGO_TOP, "EmuNAND: %s",
         (emunand_state == RES_EMUNAND_READY) ? "SD is ready" :
         (emunand_state == RES_EMUNAND_GATEWAY) ? "GW EmuNAND" : 
         (emunand_state == RES_EMUNAND_GATEWAY) ? "RedNAND" : "SD not ready" );