mfmstrategy
SADEV("rd",mfmstrategy, mfmopen, nullsys, noioctl),
err = mfmstrategy(msc, F_READ, LABELSECTOR, DEV_BSIZE, io_buf, &i);
mfmstrategy(msc, F_READ, -16, 512, io_buf, &i);
mfmstrategy(void *, int, daddr_t, size_t, void *, size_t *);