cdb2devb
cdb2devb(isonum_733(shc->location)),
rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
cdb2devb(bno + boff),
rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
cdb2devb(blkno), ISO_DEFAULT_BLOCK_SIZE, fp->f_buf, &read);