diff --git a/source/fatfs/diskio.c b/source/fatfs/diskio.c
index 003c4ba..6410933 100644
--- a/source/fatfs/diskio.c
+++ b/source/fatfs/diskio.c
@@ -37,16 +37,21 @@ DSTATUS disk_initialize (
 	BYTE pdrv				/* Physical drive nmuber to identify the drive */
 )
 {
-        DRESULT ret = RES_OK;
-        static bool sdmmcInited = false;
+        DRESULT ret;
+        static u32 sdmmcInitResult = 4;
 
-        if(!sdmmcInited)
+        if(sdmmcInitResult == 4) sdmmcInitResult = sdmmc_sdcard_init();
+
+        if(pdrv == CTRNAND)
         {
-            if(!sdmmc_sdcard_init()) ret = RES_PARERR;
-            else sdmmcInited = true;
+            if(!(sdmmcInitResult & 1))
+            {
+                ctrNandInit();
+                ret = RES_OK;
+            }
+            else ret = RES_PARERR;
         }
-
-        if(pdrv == CTRNAND) ctrNandInit();
+        else ret = (!(sdmmcInitResult & 2)) ? RES_OK : RES_PARERR;
 
 	return ret;
 }
diff --git a/source/fatfs/sdmmc/sdmmc.c b/source/fatfs/sdmmc/sdmmc.c
index c7b825b..c8327a1 100644
--- a/source/fatfs/sdmmc/sdmmc.c
+++ b/source/fatfs/sdmmc/sdmmc.c
@@ -472,8 +472,11 @@ void sdmmc_get_cid(bool isNand, u32 *info)
     sdmmc_send_command(device, 0x10507, device->initarg << 0x10);
 }
 
-bool sdmmc_sdcard_init()
+u32 sdmmc_sdcard_init()
 {
+    u32 ret = 0;
     InitSD();
-    return (Nand_Init() | SD_Init()) == 0;
+    if(Nand_Init() != 0) ret &= 1;
+    if(SD_Init() != 0) ret &= 2;
+    return ret;
 }
\ No newline at end of file
diff --git a/source/fatfs/sdmmc/sdmmc.h b/source/fatfs/sdmmc/sdmmc.h
index 42ef9ae..c17eb62 100644
--- a/source/fatfs/sdmmc/sdmmc.h
+++ b/source/fatfs/sdmmc/sdmmc.h
@@ -91,7 +91,7 @@ typedef struct mmcdevice {
     u32 res;
 } mmcdevice;
 
-bool sdmmc_sdcard_init();
+u32 sdmmc_sdcard_init();
 int sdmmc_sdcard_readsectors(u32 sector_no, u32 numsectors, u8 *out);
 int sdmmc_sdcard_writesectors(u32 sector_no, u32 numsectors, const u8 *in);
 int sdmmc_nand_readsectors(u32 sector_no, u32 numsectors, u8 *out);