Too many uncorrectable read errors with atang

John Baldwin jhb at
Fri Nov 7 11:07:22 PST 2003

On 07-Nov-2003 Kris Kennaway wrote:
> So far this has happened (well, the panic above was new) on 5 separate
> machines that were all working on older -current.  Now, these are all
> IBM DeathStar drives, but previously I was only experiencing ata
> errors every month or two, and they were correctable for another month
> or two by /dev/zero'ing the drive.
> To suddenly start receiving errors on 5 out of 7 drives in the past
> few weeks is a significant anomaly.  Perhaps one of the following is
> happening:
> 1) All my drives have performed mass suicide at once
> 2) ATAng is detecting errors that the ATAog did not
> 3) ATAng is not trying as hard as ATAog to recover from the errors
> from the crappy drives
> 4) ATAng has a bug on this hardware.

5) Interference from abnormally high solar activity.  It is known
to cause an increase in NMI's from ECC errors, so it could be a
possible explanation here even if it's a bit far-fetched.


John Baldwin <jhb at>  <><
"Power Users Use the Power to Serve!"  -

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