CAC_GET2
blks = CAC_GET2(dinfo.ncylinders) * CAC_GET1(dinfo.nheads) *
bv->bv_size = (off_t)blks * CAC_GET2(dinfo.secsize);
ld->sc_secsize = CAC_GET2(dinfo.secsize);
ld->sc_secperunit = CAC_GET2(dinfo.ncylinders) *