diff --git a/stm-firmware/fatfs/shimatta_sdio_driver/shimatta_sdio.c b/stm-firmware/fatfs/shimatta_sdio_driver/shimatta_sdio.c
index d764419..48cf8cc 100644
--- a/stm-firmware/fatfs/shimatta_sdio_driver/shimatta_sdio.c
+++ b/stm-firmware/fatfs/shimatta_sdio_driver/shimatta_sdio.c
@@ -238,6 +238,8 @@ static int sdio_check_status_register_cmd13(uint16_t rca, uint32_t *status)
 	uint32_t response;
 	int res;
 
+	*status = 0UL;
+
 	do {
 		sdio_send_cmd(13, (rca<<16)&0xFFFF0000, SHORT_ANS);
 		if (!(res = sdio_get_response(13, SHORT_ANS, &response))) {
@@ -465,10 +467,14 @@ static int sdio_send_select_card_cmd7(uint16_t rca) {
 	} while(--timeout > 0);
 
 	/* Check, if card in in TRANS state */
-	if (sdio_check_status_register_cmd13(rca, &(status.value)))
+	if (sdio_check_status_register_cmd13(rca, &status.value)) {
 		res = -1;
+		goto ret_val;	
+	}
 	if (status.statusstruct.CURRENT_STATE != CURRENT_STATE_TRAN)
 		res = -2;
+
+ret_val:
 	return res;
 }
 
@@ -705,9 +711,10 @@ DRESULT sdio_disk_write(const BYTE *buff, DWORD sector, UINT count)
 
 	while (count) {
 		do {
-			sdio_check_status_register_cmd13(card_info.rca, &status.value);
+			ret = sdio_check_status_register_cmd13(card_info.rca, &status.value);
 		} while (status.statusstruct.CURRENT_STATE == CURRENT_STATE_PRG ||
-			 status.statusstruct.CURRENT_STATE == CURRENT_STATE_RCV);
+			 status.statusstruct.CURRENT_STATE == CURRENT_STATE_RCV ||
+			 !ret);
 
 		if (status.statusstruct.CURRENT_STATE == CURRENT_STATE_STBY) {
 			if (sdio_send_select_card_cmd7(card_info.rca))