diff --git a/build/libraries/devices/sdmc/ARM7/drnand.c b/build/libraries/devices/sdmc/ARM7/drnand.c
index af9b31e..4e36736 100644
--- a/build/libraries/devices/sdmc/ARM7/drnand.c
+++ b/build/libraries/devices/sdmc/ARM7/drnand.c
@@ -138,16 +138,7 @@ BOOL nandCheckMedia( void) //TODO:nand partition
         (systemid!=0x0B) && (systemid!=0x0C)) {
         return( FALSE);
     }
-    /* Check the System ID of unuse partitions. */
-    for( i=1; i<4; i++) {
-        systemid = bufp[450+(16*i)];
-        if( systemid != 0x00) {
-            return( FALSE);
-        }
-    }
-    /**/
-    /*もっと厳密にチェックするならパーティション0開始位置の
-        正当性も調べる*/
+
     return( TRUE);
 }
 
diff --git a/build/libraries/devices/sdmc/ARM7/sdmc.c b/build/libraries/devices/sdmc/ARM7/sdmc.c
index 7e08b32..e82f642 100644
--- a/build/libraries/devices/sdmc/ARM7/sdmc.c
+++ b/build/libraries/devices/sdmc/ARM7/sdmc.c
@@ -2401,7 +2401,7 @@ static void SDCARD_Thread( void* arg)
     while( TRUE) {
         /* メッセージ待ち */
         PRINTDEBUG( "rcv mes sdThread\n");
-        OS_ReceiveMessage( &sdmc_dtq, &current_dat, OS_MESSAGE_BLOCK);
+        OS_ReadMessage( &sdmc_dtq, &current_dat, OS_MESSAGE_BLOCK);
         SdMsg = (SDCARDMsg*)current_dat;
         PRINTDEBUG( "sd task : receive command : %d\n", SdMsg->operation);
 
@@ -2444,6 +2444,7 @@ static void SDCARD_Thread( void* arg)
         /*メッセージ返送*/
         current_dat = (OSMessage)api_result;
         OS_SendMessage( &sdmc_result_dtq, current_dat, OS_MESSAGE_BLOCK);
+        OS_ReceiveMessage( &sdmc_dtq, &current_dat, OS_MESSAGE_BLOCK);
     }
 }