de_clcount
error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
fc_purge(dep, de_clcount(pmp, length));
count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
dirclust = de_clcount(pmp, diroffset);
de_clcount(fatVolume, fatNode->de_FileSize));