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

Mike Clarke jmc-freebsd2 at
Sat Nov 12 16:42:45 UTC 2016

On Fri, 11 Nov 2016 20:57:34 -0600
Adam Vande More <amvandemore at> wrote:

> There is roughly a 0% chance this has anything to do with your partitioning
> scheme or your cables.

Agreed, but cables were easy to eliminate just in case. I can't imagine
how partitioning could directly affect it but the fact that the problem
arose after erasing and partitioning does suggest it might be related
to something which I did at the time.

> To the best of my knowledge this is basically only
> alterable by BIOS settings(ahci), drive firmware settings or a jumper,
> settings listed in ahci(4), and sata controller version.

There's been no BIOS changes, apart from adjusting the boot priority
order after moving drives between SATA ports. The BIOS has no settings
which could affect the performance of just one drive. There's been no
firmware updates and no settings have been changed.

Mike Clarke

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