diff --git a/Makefile b/Makefile
index d0e3130..ab69791 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@ INCLUDES	:=	source source/fatfs source/nand
 #---------------------------------------------------------------------------------
 ARCH	:=	-mthumb -mthumb-interwork -flto
 
-CFLAGS	:=	-g -Wall -Wextra -Wpedantic -pedantic -O2\
+CFLAGS	:=	-g -Wall -Wextra -Wpedantic -Wcast-align -pedantic -O2\
 			-march=armv5te -mtune=arm946e-s -fomit-frame-pointer\
 			-ffast-math -std=c99\
 			$(ARCH)
diff --git a/source/common.h b/source/common.h
index 2aab15b..7563d8c 100644
--- a/source/common.h
+++ b/source/common.h
@@ -28,9 +28,12 @@
     ((((u32) getbe16(d))<<16) | ((u32) getbe16(d+2)))
 #define getbe64(d) \
     ((((u64) getbe32(d))<<32) | ((u64) getbe32(d+4)))
-#define getle16(d) (*((u16*) (d)))
-#define getle32(d) (*((u32*) (d)))
-#define getle64(d) (*((u64*) (d)))
+#define getle16(d) \
+    (((d)[1]<<8) | (d)[0])
+#define getle32(d) \
+    ((((u32) getle16(d+2))<<16) | ((u32) getle16(d)))
+#define getle64(d) \
+    ((((u64) getle32(d+4))<<32) | ((u64) getle32(d)))
 #define align(v,a) \
     (((v) % (a)) ? ((v) + (a) - ((v) % (a))) : (v))
 
diff --git a/source/fs.c b/source/fs.c
index 99160a4..28dbaed 100644
--- a/source/fs.c
+++ b/source/fs.c
@@ -105,7 +105,7 @@ uint64_t GetSDCardSize() {
     return (u64) getMMCDevice(1)->total_size * 512;
 }
 
-bool FormatSDCard(u32 hidden_mb) {
+bool FormatSDCard(u64 hidden_mb) {
     u8 mbr[0x200] = { 0 };
     u8 mbrdata[0x42] = {
         0x80, 0x01, 0x01, 0x00, 0x0C, 0xFE, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -115,22 +115,23 @@ bool FormatSDCard(u32 hidden_mb) {
         0x55, 0xAA
     };
     u32 sd_size = getMMCDevice(1)->total_size;
-    u32* fat_sector = (u32*) (mbrdata + 0x08);
-    u32* fat_size   = (u32*) (mbrdata + 0x0C);
-    u32* emu_sector = (u32*) (mbrdata + 0x18);
-    u32* emu_size   = (u32*) (mbrdata + 0x1C);
+    u32 emu_sector = 1;
+    u32 emu_size = (u32) ((hidden_mb * 1024 * 1024) / 512);
+    u32 fat_sector = align(emu_sector + emu_size, 0x2000); // align to 4MB
+    u32 fat_size = (fat_sector < sd_size) ? sd_size - fat_sector : 0;
     
-    *emu_sector = 1;
-    *emu_size = hidden_mb * (1024 * 1024) / 512;
-    *fat_sector = align(*emu_sector + *emu_size, 0x2000); // align to 4MB
-    if (sd_size < *fat_sector + 0x80000) { // minimum free space: 256MB
+    // FAT size check
+    if (fat_size < 0x80000) { // minimum free space: 256MB
         ShowPrompt(false, "ERROR: SD card is too small");
         return false;
     }
-    *fat_size = sd_size - *fat_sector;
-    sd_size = *fat_size;
+    sd_size = fat_size;
     
     // build the MBR
+    memcpy(mbrdata + 0x08, &fat_sector, 4);
+    memcpy(mbrdata + 0x0C, &fat_size, 4);
+    memcpy(mbrdata + 0x18, &emu_sector, 4);
+    memcpy(mbrdata + 0x1C, &emu_size, 4);
     memcpy(mbr + 0x1BE, mbrdata, 0x42);
     if (hidden_mb) memcpy(mbr, "GATEWAYNAND", 12);
     else memset(mbr + 0x1CE, 0, 0x10);
@@ -138,7 +139,7 @@ bool FormatSDCard(u32 hidden_mb) {
     // one last warning....
     if (!ShowUnlockSequence(3, "!WARNING!\n \nProceeding will format this SD.\nThis will irreversibly delete\nALL data on it.\n"))
         return false;
-    ShowString("Formatting SD, please wait...", hidden_mb); 
+    ShowString("Formatting SD, please wait..."); 
     
     // write the MBR to disk
     // !this assumes a fully deinitialized file system!
diff --git a/source/fs.h b/source/fs.h
index f538900..c68072d 100644
--- a/source/fs.h
+++ b/source/fs.h
@@ -46,7 +46,7 @@ void SetFSSearch(const char* pattern, const char* path);
 uint64_t GetSDCardSize();
 
 /** Format the SD card **/
-bool FormatSDCard(u32 hidden_mb);
+bool FormatSDCard(u64 hidden_mb);
 
 /** Check if writing to this path is allowed **/
 bool CheckWritePermissions(const char* path);
diff --git a/source/godmode.c b/source/godmode.c
index 1771a1a..71a23ac 100644
--- a/source/godmode.c
+++ b/source/godmode.c
@@ -205,7 +205,7 @@ u32 SdFormatMenu(void) {
     } while (emunand_size_mb > sdcard_size_mb);
     if (emunand_size_mb == (u64) -1) return 1;
     
-    if (!FormatSDCard((u32) emunand_size_mb)) {
+    if (!FormatSDCard(emunand_size_mb)) {
         ShowPrompt(false, "Format SD: failed!");
         return 1;
     }
diff --git a/source/nand/nand.c b/source/nand/nand.c
index d9776e3..87b1395 100644
--- a/source/nand/nand.c
+++ b/source/nand/nand.c
@@ -126,13 +126,13 @@ bool InitNandCrypto(void)
     }
         
     // part #1: Get NAND CID, set up TWL/CTR counter
-    u8 NandCid[16];
+    u32 NandCid[4];
     u8 shasum[32];
     
-    sdmmc_get_cid( 1, (uint32_t*) NandCid);
-    sha_quick(shasum, NandCid, 16, SHA256_MODE);
+    sdmmc_get_cid( 1, NandCid);
+    sha_quick(shasum, (u8*) NandCid, 16, SHA256_MODE);
     memcpy(CtrNandCtr, shasum, 16);
-    sha_quick(shasum, NandCid, 16, SHA1_MODE);
+    sha_quick(shasum, (u8*) NandCid, 16, SHA1_MODE);
     for(u32 i = 0; i < 16; i++) // little endian and reversed order
         TwlNandCtr[i] = shasum[15-i];
     
@@ -146,10 +146,11 @@ bool InitNandCrypto(void)
         // thanks b1l1s & Normmatt
         // see source from https://gbatemp.net/threads/release-twltool-dsi-downgrading-save-injection-etc-multitool.393488/
         const char* nintendo = "NINTENDO";
-        u32* TwlKeyXW = (u32*) TwlKeyX;
-        TwlKeyXW[0] = (TwlCustId[0] ^ 0xB358A6AF) | 0x80000000;
-        TwlKeyXW[3] = TwlCustId[1] ^ 0x08C267B7;
-        memcpy(TwlKeyX + 4, nintendo, 8);
+        u32 TwlKeyXW0 = (TwlCustId[0] ^ 0xB358A6AF) | 0x80000000;
+        u32 TwlKeyXW3 = TwlCustId[1] ^ 0x08C267B7;
+        memcpy(TwlKeyX +  4, nintendo, 8);
+        memcpy(TwlKeyX +  0, &TwlKeyXW0, 4);
+        memcpy(TwlKeyX + 12, &TwlKeyXW3, 4);
         
         // see: https://www.3dbrew.org/wiki/Memory_layout#ARM9_ITCM
         u32 TwlKeyYW3 = 0xE1A00005;