sd_check_for_writable_cd
static void sd_check_for_writable_cd(sd_ssc_t *ssc, int path_flag);
sd_check_for_writable_cd(ssc, SD_PATH_DIRECT_PRIORITY);
sd_check_for_writable_cd(ssc, SD_PATH_DIRECT);
sd_check_for_writable_cd(ssc, SD_PATH_DIRECT);