Comment 3 for bug 10661

I've just had a very unpleasant experience which goes more or less the same. I
installed ubuntu on a co-workers machine to dual boot with his NTFS Windows 2000.

Grub correctly detected Win2000 and added an entry for it. But on trying to boot
windows, Grub moaned about not knowing what partition type it was. This was
followed by "Disk Read Error, Type <CTRL>-<ALT>-<DEL> to reboot." Shock and
horror. I tried various permutations of (hdx,x) from what was available from
tab-completion. But it was very obvious that this was not the problem.

Fortunately we were able to bring windows back with a Win98 boot stiffy and
"fdisk /mbr". Alas, ubuntu on that machine is no more.