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Date: Wed, 2 Jul 2008 15:34:24 +0100
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] "A disk read error occurred"
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To: qemu-devel@nongnu.org

Alexander (Sasha) Sirotkin wrote:
> On Tue, Jul 1, 2008 at 2:05 AM, Jamie Lokier <jamie@shareable.org> wrote:
> > Avi Kivity wrote:
> >> Alexander (Sasha) Sirotkin wrote:
> >> >For some reason when I try to boot qemu with -hda /dev/sda (or -hda
> >> >/dev/hda), i.e. to use the whole disk, it fails with the above error
> >> >"A disk read error occurred". This happens only on IBM/Lenovo laptops
> >> >(tried a few models), while it works just fine on any desktop I can
> >> >get my hands on. Probably has something to do with bios...
> >> >
> >> >
> >>
> >> Can you add some printfs displaying the sector numbers being read?  Some
> >> disks have trouble accessing the last sector.
> There are no printfs, no sector numbers, nothing. Just the above error.
> >>
> >> Also, an strace can help show the problem.
> The whole strace is too big, attaching last 1000 lines
> >
> > Also, sometimes when booting the BIOS can print a disk read error
> > message, and an appropriate -hdachs will fix it.  I found that out
> > when rebooting Windows 2000 after installing it from CD (both in
> > QEMU), on a virtual disk 1GB in size.
> >
> 
> I must say that I don't understand what chs values I should give to
> qemu. hdparm  shows 9729/255/63, but fdisk insists on 10337,240,63.
> Both versions do not work with qemu, it says "invalid physical CHS
> format"
> BTW, hdparm -i shows yet another version - RawCHS=16383/16/63

Try -hdachs 1023,16,63,lba.
If that doesn't work, try it without lba.
If those don't work, try 255 for the middle number, with/without lba.

-- Jamie