diff --git a/components/dfs/filesystems/elmfat/dfs_elm.c b/components/dfs/filesystems/elmfat/dfs_elm.c
index 7c4ecb1baf5640ac0ca71fb02afe8f9e354cba22..a385295ec3818afb829fc998d9ce2ac8ba1274be 100644
--- a/components/dfs/filesystems/elmfat/dfs_elm.c
+++ b/components/dfs/filesystems/elmfat/dfs_elm.c
@@ -780,6 +780,10 @@ DRESULT disk_ioctl(BYTE drv, BYTE ctrl, void *buff)
 		rt_device_control(device, RT_DEVICE_CTRL_BLK_GETGEOME, &geometry);
 
 		*(DWORD *)buff = geometry.block_size/geometry.bytes_per_sector;
+	}
+	else if (ctrl == CTRL_SYNC)
+	{
+		rt_device_control(device, RT_DEVICE_CTRL_BLK_SYNC, RT_NULL);
 	}
 
 	return RES_OK;