validate_cs
status = validate_cs(iter.fatVolume, iter.cluster, iter.sector);
status = validate_cs(iter.fatVolume, iter.cluster, iter.sector);
if ((ret = validate_cs(fatVolume, cluster, sector)) != B_OK)
ASSERT(validate_cs(csi->fatVolume, csi->cluster, csi->sector) == 0);
status_t validate_cs(msdosfsmount* fatVolume, uint32 cluster, uint32 sector);