diff --git a/source/abstraction/a9-start.s b/source/abstraction/a9-start.s
index 3cd1ae9..6cca4cf 100644
--- a/source/abstraction/a9-start.s
+++ b/source/abstraction/a9-start.s
@@ -63,9 +63,9 @@ _start:
     mcr p15, 0, r5, c7, c10, 4 @ drain write buffer
 
     @ Fixes mounting of SDMC
-	ldr r0, =0x10000020
-	mov r1, #0x340
-	str r1, [r0]
+    ldr r0, =0x10000020
+    mov r1, #0x340
+    str r1, [r0]
 
     bl main
 
diff --git a/source/abstraction/gw-start.s b/source/abstraction/gw-start.s
index 63872e0..5ddd33a 100644
--- a/source/abstraction/gw-start.s
+++ b/source/abstraction/gw-start.s
@@ -93,12 +93,12 @@ _start:
     mcr p15, 0, r5, c7, c10, 4 @ drain write buffer
 
     @ Fixes mounting of SDMC
-	ldr r0, =0x10000020
-	mov r1, #0x340
-	str r1, [r0]
-    
-    ldr sp,=0x22160000
-    ldr    r3, =main
+    ldr r0, =0x10000020
+    mov r1, #0x340
+    str r1, [r0]
+
+    ldr sp, =0x22160000
+    ldr r3, =main
     blx r3
 .pool
 
diff --git a/source/fatfs/diskio.c b/source/fatfs/diskio.c
index 2b62445..4db0442 100644
--- a/source/fatfs/diskio.c
+++ b/source/fatfs/diskio.c
@@ -130,18 +130,17 @@ DSTATUS disk_initialize (
 )
 {
     if (pdrv == 0) { // a mounted SD card is the preriquisite for everything else
-        if (!sdmmc_sdcard_init())
-            return RES_PARERR;
+        if (!sdmmc_sdcard_init()) return STA_NODISK;
     } else if (pdrv < 4) {
         nand_type_sys = CheckNandType(NAND_SYSNAND);
-        if (!nand_type_sys) return RES_PARERR;
+        if (!nand_type_sys) return STA_NODISK;
     } else if (pdrv < 7) {
         nand_type_emu = CheckNandType(NAND_EMUNAND);
-        if (!nand_type_emu) return RES_PARERR;
+        if (!nand_type_emu) return STA_NODISK;
     } else if (pdrv < 10) {
-        if (!GetMountState()) return RES_PARERR;
+        if (!GetMountState()) return STA_NODISK;
         nand_type_img = CheckNandType(NAND_IMGNAND);
-        if (!nand_type_img) return RES_PARERR;
+        if ((!nand_type_img) && (pdrv != 7)) return STA_NODISK;
     }
 	return RES_OK;
 }
@@ -246,13 +245,13 @@ DRESULT disk_ioctl (
             if (type == TYPE_SDCARD) { // SD card
                 *((DWORD*) buff) = getMMCDevice(1)->total_size;
             } else if (type == TYPE_IMAGE) { // FAT image
-                *((DWORD*) buff) = GetMountSize();
+                *((DWORD*) buff) = GetMountSize() / 0x200;
             } else if (type != TYPE_NONE) { // NAND
                 *((DWORD*) buff) = get_subtype_desc(pdrv)->size;
             }
             return RES_OK;
         case GET_BLOCK_SIZE:
-            *((DWORD*) buff) = 0x2000;
+            *((DWORD*) buff) = (type == TYPE_IMAGE) ? 0x1 : 0x2000;
             return RES_OK;
         case CTRL_SYNC:
             if ((type == TYPE_IMAGE) || (type == TYPE_IMGNAND))