DOSMBR_SIGNATURE_OFF
if (*(u_int16_t *)&buf[DOSMBR_SIGNATURE_OFF] == DOSMBR_SIGNATURE) {
memcpy(&sig, dosbb + DOSMBR_SIGNATURE_OFF, sizeof(sig));
memcpy(&sig, dosbb + DOSMBR_SIGNATURE_OFF, sizeof(sig));
memcpy(&sig, bp->b_data + DOSMBR_SIGNATURE_OFF,