SSD drive appears to have been "downgraded" from SATA 2 to SATA 1

David Christensen dpchrist at
Thu Nov 10 03:12:45 UTC 2016

On 11/09/2016 02:20 PM, Mike Clarke wrote:
> I have two allegedly identical SanDisk SATA 3 SSD drives connected to
> my SATA 2 motherboard as a ZFS mirror. One of these drives (ada2) is
> reported as running as SATA 2 as expected but the other (ada0) is only
> reported as SATA 1.
> I've swapped the drive connections and cables between the 2 SATA ports
> but the same drive still shows up as SATA 1 so I'm assuming the
> discrepancy lies with the drives and not the motherboard or drivers.
> Could there be any way that the system could at some time have forced
> the drive down to SATA 1, in which case how do I revert it? Or is it
> more likely that I have a faulty SSD drive?

I would:

1.  Install a SATA 2 or 3 HBA and test the drives again.

2.  Put the drives in another machine with SATA 2 or 3 ports and test
the drives again.


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