diff --git a/Externals/WiiUse/Inc/wiiuse.h b/Externals/WiiUse/Inc/wiiuse.h
index 42e57f08c8..00434420cd 100644
--- a/Externals/WiiUse/Inc/wiiuse.h
+++ b/Externals/WiiUse/Inc/wiiuse.h
@@ -556,7 +556,7 @@ typedef struct wiimote_t {
 
 	WCONST struct read_req_t* read_req;		/**< list of data read requests				*/
 	WCONST struct accel_t accel_calib;		/**< wiimote accelerometer calibration		*/
-	WCONST struct expansion_t exp;			/**< wiimote expansion device				*/
+	WCONST struct expansion_t expansion;	/**< wiimote expansion device				*/
 
 	WCONST struct vec3b_t accel;			/**< current raw acceleration data			*/
 	WCONST struct orient_t orient;			/**< current orientation on each axis		*/
diff --git a/Source/Core/Common/Src/SDCardUtil.cpp b/Source/Core/Common/Src/SDCardUtil.cpp
index 985e02d8ca..856afaeace 100644
--- a/Source/Core/Common/Src/SDCardUtil.cpp
+++ b/Source/Core/Common/Src/SDCardUtil.cpp
@@ -193,12 +193,15 @@ bool SDCardCreate(u64 disk_size /*in MB*/, char* filename)
 	FILE* f;
 
 	// Convert MB to bytes
-	disk_size *= 1024*1024;
+	disk_size *= 1024 * 1024;
 
-	if (disk_size < 0x800000 || disk_size > 0x800000000ULL)
+	if (disk_size < 0x800000 || disk_size > 0x800000000ULL) {
 		ERROR_LOG(COMMON, "Trying to create SD Card image of size %iMB is out of range (8MB-32GB)", disk_size/(1024*1024));
+		return false;
+	}
 
-	sectors_per_disk = disk_size / 512;
+	// pretty unlikely to overflow.
+	sectors_per_disk = (int)(disk_size / 512);
 	sectors_per_fat  = get_sectors_per_fat(disk_size, get_sectors_per_cluster(disk_size));
 
 	boot_sector_init(s_boot_sector, s_fsinfo_sector, disk_size, NULL );
diff --git a/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_Zelda_Synth.cpp b/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_Zelda_Synth.cpp
index 439bbc960c..6ba908d359 100644
--- a/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_Zelda_Synth.cpp
+++ b/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_Zelda_Synth.cpp
@@ -28,7 +28,7 @@ void CUCode_Zelda::RenderSynth_RectWave(ZeldaVoicePB &PB, s32* _Buffer, int _Siz
 {
 	float _ratioFactor = 32000.0f / (float)soundStream->GetMixer()->GetSampleRate();
 	u32 _ratio = (PB.RatioInt << 16);
-	s64 ratio = (_ratio * _ratioFactor) * 16;
+	s64 ratio = (s64)((_ratio * _ratioFactor) * 16);
 	s64 TrueSamplePosition = PB.CurSampleFrac;
 
 	// PB.Format == 0x3 -> Rectangular Wave, 0x0 -> Square Wave
diff --git a/Source/Plugins/Plugin_VideoDX9/Src/D3DBase.h b/Source/Plugins/Plugin_VideoDX9/Src/D3DBase.h
index 1a1550d3e3..3472ea7c78 100644
--- a/Source/Plugins/Plugin_VideoDX9/Src/D3DBase.h
+++ b/Source/Plugins/Plugin_VideoDX9/Src/D3DBase.h
@@ -111,7 +111,8 @@ struct Resolution
 struct AALevel
 {
 	AALevel(const char *n, D3DMULTISAMPLE_TYPE m, int q) {
-		strcpy(name, n);
+		strncpy(name, n, 32);
+		name[31] = '\0';
 		ms_setting = m; 
 		qual_setting = q;
 	}
diff --git a/Source/Plugins/Plugin_VideoSoftware/Src/CommandProcessor.cpp b/Source/Plugins/Plugin_VideoSoftware/Src/CommandProcessor.cpp
index 4b58effbd8..6b2d0733b4 100644
--- a/Source/Plugins/Plugin_VideoSoftware/Src/CommandProcessor.cpp
+++ b/Source/Plugins/Plugin_VideoSoftware/Src/CommandProcessor.cpp
@@ -433,7 +433,7 @@ bool RunBuffer()
         OpcodeDecoder::Run(availableBytes);
 
         // if data was read by the opcode decoder then the video data pointer changed
-        readPos = g_pVideoData - &commandBuffer[0];
+        readPos = (u32)(g_pVideoData - &commandBuffer[0]);
         _dbg_assert_(VIDEO, writePos >= readPos);
         availableBytes = writePos - readPos;
     }