CLUST12_MASK
} else if (boot->NumClusters < (CLUST_RSRVD&CLUST12_MASK)) {
boot->ClustMask = CLUST12_MASK;
retval &= CLUST12_MASK;
if (retval >= (CLUST_BAD & CLUST12_MASK))
retval |= ~CLUST12_MASK;
nextcl &= CLUST12_MASK;
case CLUST12_MASK: