diff --git a/source/disc_io/io_m3sd.c b/source/disc_io/io_m3sd.c
index f1253a7..5ea117b 100644
--- a/source/disc_io/io_m3sd.c
+++ b/source/disc_io/io_m3sd.c
@@ -256,7 +256,7 @@ static bool _M3SD_initCard (void) {
 			return false;
 		}
 	
-		_M3SD_sendCommand (SD_APP_OP_COND, 3<<16);
+		_M3SD_sendCommand (SD_APP_OP_COND, SD_OCR_VALUE);
 		if ((_M3SD_getResponse_R3 (responseBuffer)) && ((responseBuffer[1] & 0x80) != 0)) {	
 			// Card is ready to receive commands now
 			break;
diff --git a/source/disc_io/io_scsd.c b/source/disc_io/io_scsd.c
index 13648a8..f4891a5 100644
--- a/source/disc_io/io_scsd.c
+++ b/source/disc_io/io_scsd.c
@@ -208,7 +208,7 @@ static bool _SCSD_initCard (void) {
 			return false;
 		}
 	
-		_SCSD_sendCommand (SD_APP_OP_COND, 3<<16);
+		_SCSD_sendCommand (SD_APP_OP_COND, SD_OCR_VALUE);
 		if ((_SCSD_getResponse_R3 (responseBuffer)) && ((responseBuffer[1] & 0x80) != 0)) {	
 			// Card is ready to receive commands now
 			break;
diff --git a/source/disc_io/io_sd_common.h b/source/disc_io/io_sd_common.h
index 0d17257..3ed5afb 100644
--- a/source/disc_io/io_sd_common.h
+++ b/source/disc_io/io_sd_common.h
@@ -32,6 +32,9 @@
 
 	2006-07-11 - Chishm
 		* Original release
+	
+	2006-07-28 - Chishm
+		* Changed voltage range that the SD card can use
 */
 
 #ifndef IO_SD_COMMON_H
@@ -59,6 +62,9 @@
 #define SET_BUS_WIDTH 6
 #define SD_APP_OP_COND 41
 
+/* OCR (Operating Conditions Register) send value */
+//#define SD_OCR_VALUE 0x00030000 /* 2.8V to 3.0V */
+#define SD_OCR_VALUE 0x003F8000 /* 2.7V to 3.4V */
 
 /* SD Data repsonses */
 #define SD_CARD_BUSY 0xff