CLUST_BAD
if (cl < CLUST_BAD)
if (cl > CLUST_BAD)
if ((*cp1 != CLUST_FREE && *cp1 < CLUST_BAD
&& *cp2 != CLUST_FREE && *cp2 < CLUST_BAD)
|| (*cp1 > CLUST_BAD && *cp2 > CLUST_BAD)) {
|| fat[head].next == CLUST_BAD)
if (*next == CLUST_BAD) {