ahci0.4: Transient Errors: 40 (7)

[Mohammad BadieZadegan]

Hi everybody,
I installed DF-BSD 4.2.0 and while I standby or installing any tools the
message of *ahci0.4: Transient Errors: 40<PCS> (7)* notify me more times!
What's the matter? If no problem how can I disable that?
Thanks.