DISK_RR_UNKNOWN
if (dp->d_rotation_rate == DISK_RR_UNKNOWN) /* Old drives */
uint16_t rr = DISK_RR_UNKNOWN;
rr = DISK_RR_UNKNOWN;
disk->d_rotation_rate = DISK_RR_UNKNOWN;
if (ret < 0 || arg.value.u16 == DISK_RR_UNKNOWN)