Re: [PATCH] Bogus LBA48 drives

[Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>]

On Tuesday 30 of March 2004 17:22, Geert Uytterhoeven wrote:
> Apparently some IDE drives (e.g. a pile of 80 GB ST380020ACE drives I have
> access to) advertise to support LBA48, but don't, causing kernels that
> support LBA48 (i.e. anything newer than 2.4.18, including 2.4.25 and 2.6.4)
> to fail on them.  Older kernels (including 2.2.20 on the Debian woody CDs)
> work fine.
>
> One problem with those drives is that the lba_capacity_2 field in their
> drive identification is set to 0, making the IDE driver think the disk is 0
> bytes large. At first I tried modifying the driver to use lba_capacity if
> lba_capacity_2 is set to 0, but this caused disk errors. So it looks like
> those drives don't support the increased transfer size of LBA48 neither.

I think somebody should make Seagate aware of the issue.

> I added a workaround for these drives to both 2.4.25 and 2.6.4. I'll send
> patches in follow-up emails.

They look okay but some comment about this issue would be useful.

Thanks,
Bartlomiej