ahci0.4: Transient Errors: 40<PCS> (7)

[Matthew Dillon]

If you get PCS errors during moderate or heavy disk I/O it means there is
probably too much electrical cross talk or noise on the SATA link.
Probably a cabling issue.  Either the cable is not shielded or the cable is
going through an enclosure connector and not directly connected to the
drive.  Sometimes sub-stanadard motherboards have cross talk on the traces
(though it is rare).  Sometimes sub-standard hot-swap bay enclosures have
similar issues. More likely the cable is not shielded.  If it is a mobo
issue you can try connecting the cable to a different SATA connector.

Transient PCS errors are fairly serious if they occur at times other than
when you are inserting or removing a drive from a hot swap bay.

-Matt

On Tue, Jun 30, 2015 at 5:38 AM, Mohammad BadieZadegan <mbzadegan at gmail.com>
wrote:

> 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.
>
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