diff --git a/FATFS/shimatta_sdio_driver/shimatta_sdio-driver.c b/FATFS/shimatta_sdio_driver/shimatta_sdio-driver.c
index cbe94dd..faf4153 100644
--- a/FATFS/shimatta_sdio_driver/shimatta_sdio-driver.c
+++ b/FATFS/shimatta_sdio_driver/shimatta_sdio-driver.c
@@ -68,8 +68,9 @@ DRESULT SDIO_disk_ioctl(BYTE cmd, void* buff){
         //TODO: Implement
         break;
       case CTRL_SYNC:
-        res = RES_ERROR;
-        //TODO: Implement
+        res = RES_OK;
+        //No cache
+        //Nothing to do
         break;
      default:
         res = RES_PARERR;