cdb2devb
if (dread(dev, buf, 1, cdb2devb(16)) != 0) {
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,