ATA_DFLAG_NCQ
dev->flags |= ATA_DFLAG_NCQ;
if (adev->flags & ATA_DFLAG_NCQ) {
adev->flags &= ~ATA_DFLAG_NCQ;
return (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ;