From: Stefan Monnier <monnier@iro.umontreal.ca>
To: linux-ide@vger.kernel.org
Subject: "80-wire cables" issue when using SATA drives in PATA Thinkpads
Date: Tue, 05 Jan 2021 10:36:16 -0500 [thread overview]
Message-ID: <jwvczyjxvb7.fsf-monnier+Inbox@gnu.org> (raw)
[ Not sure where to send this question.
This mailing-list seems to be much more oriented towards development of
libata code than its use, but the question seems too technical for
other foras. ]
I'm trying to use a SATA M.2 drive in a Thinkpad X30 (via a PATA->M.2
enclosure) and am bumping into a ~30MB/s bandwidth limit that's
apparently imposed by the BIOS for "lack" of an 80-wire cable.
This is mentioned at the end of
https://www.thinkwiki.org/wiki/How_to_put_SATA_in_old_ThinkPads
and links to
https://forum.thinkpads.com//viewtopic.php?f=31&t=115478&p=741729
which mentions this as a known problem.
Is there some known workaround for it?
I tried to boot with `libata.force=80c` and it does result in `hdparm`
claiming that `udma5` is used instead of `udma2`, but that seems to be
a lie because the actual bandwidth I see is still ~30MB/s.
How can I diagnose the problem further (and ideally fix it)?
Stefan
reply other threads:[~2021-01-05 15:46 UTC|newest]
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