FCF_ID_MAG0
if (bcmp(&ckp->ckp_hdr->fcfh_ident[FCF_ID_MAG0],
ckp->ckp_hdr->fcfh_ident[FCF_ID_MAG0] = FCF_MAG_MAG0;
h.fcfh_ident[FCF_ID_MAG0], h.fcfh_ident[FCF_ID_MAG1],