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Date:      Sat, 8 Sep 2001 01:16:47 -0500
From:      Dave Uhring <duhring@charter.net>
To:        Marius Strom <marius@marius.org>, ian j hart <ianjhart@ntlworld.com>
Cc:        Randall Hopper <aa8vb@nc.rr.com>, stable@FreeBSD.ORG
Subject:   Re: UDMA ICRC error reading fsb (?)
Message-ID:  <auto-000013329585@dc-mx03.cluster1.charter.net>
In-Reply-To: <20010907234848.A1323@marius.org>
References:  <20010906204356.A4116@nc.rr.com> <3B994E08.FF3BE9C4@ntlworld.com> <20010907234848.A1323@marius.org>

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On Friday 07 September 2001 11:48 pm, Marius Strom wrote:
> FWIW, I had this error and assumed it was cabling.  I've spent the
> last few hours copying data of what is now a dead disk and putting it
> back on a new disk.  YMMV.
>
> On Fri, Sep 07, 2001 at 11:45:28PM +0100, ian j hart wrote:
> > Dave Uhring wrote:
> > > On Friday 07 September 2001 17:04, Randall Hopper wrote:
> > > > Dave Uhring:
> > > >  |On Thursday 06 September 2001 07:43 pm, Randall Hopper wrote:
> > > >  |>      What do these messages mean?  Are CRCs done by the IDE
> > > >  |> controller on DMA transfers and they're coming up wrong?
> > > >  |>
> > > >  |> ad0s2a: UDMA ICRC error writing fsbn 3283483 of
> > > >  |> 396704-396713 (ad0s2 bn 3283483; cn 204 tn 98 sn 49)
> > > >  |> retrying
> > > >  |
> > > >  |Your drive is dying.  Back it up and replace it.
> >
> > I think you are being a tad premature.
> >
> > There have been plenty of posts on this subject, both on stable and
> > hardware. IIRC none of them were bad disks.
> >
> > Randall,
> > 1) post a copy of dmesg so we can see what hardware you have.
> > 2) measure the cable - M/B to drive.
> >
> > > > Ok, thanks.  But what do these messages "mean" on a technical
> > > > level?
> > > >
> > > > And could these just as well indicate a marginal cable, bad
> > > > connector, loose connector, or the other hard drive on the
> > > > controller being a bit flakey?
> > > >
> > > > Randall
> > >
> > > CRC's (16 bit cyclic redundancy check characters) have been done
> > > on controllers since we had to use floppies.  The first
> > > Winchester drive interface I ever designed back in 1979 had a
> > > Fairchild 9401 (IIRC) CRC generator chip on it.  The writes are
> > > failing.  You "may" have marginal cabling or loose or corroded
> > > connectors.
> > >
> > > If you wish to keep using the drive, replace the cable and in
> > > doing so your contacts will also wipe clean.
> > --
> > ian j hart

IDE cables which are somewhat too long can cause many problems with 
data transfer.  However, the cable certainly didn't grow in length 
overnight.  Sudden onset of the described problems "may" be due to 
corrosion of the cable contacts, but it is most likely due to a drive 
failure.  Most modern drives support S.M.A.R.T. and it would be nice if 
FreeBSD had a utility to detect the drive's complaints.  Perhaps it is 
in the ports, but my weak eyes have failed to see it.

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