ATAIOCCOMMAND
error = ioctl(fd, ATAIOCCOMMAND, req);
error = ioctlf(fp, ATAIOCCOMMAND, &req);
IOCTL_STRUCT_CONV_TO(ATAIOCCOMMAND, atareq);
case ATAIOCCOMMAND:
if (!disk_ioctl(dd->dd_name, ATAIOCCOMMAND, &req)