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

Mohammad BadieZadegan mbzadegan at gmail.com
Wed Jul 1 02:02:04 PDT 2015

Thanks Dear Matthew Dillon,
When I turn on my notebook and before Login this message was appeared every
20 seconds!
I wonder that why this warning only reported by DragonflyBSD and did not
reported by other BSDs.
Thanks alot for your Help.

On Tue, Jun 30, 2015 at 8:20 PM, Matthew Dillon <dillon at backplane.com>

> 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.

[image: See you on my WEB] <http://933k.ir>
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