Thanks for testing this out! You have narrowed it down to the grub
loader. Now for the critical difference between the two grubs... The
Ubuntu grub has a lot of Ubuntu changes patched in, I don't know about
the Mandriva one. No surprise they have different file size, they are
compiled in different environments anyway. The Ubuntu patches deal with
both stage1 and stage2, so I guess that's why you can not mix stage
files. And yes, the 17 vs 15 sectors is just the filesize/512 rounded
up.

Since both of you have ICH7, it's tempting to believe that the
corruption is due to the way grub accesses the disk and that something
in that chipset triggers the problem. However AFAIK grub just uses BIOS
calls and doesn't care about hardware details, unless there is something
with disk geometry - which should be only disk-specific. I've got ICH7
myself, without problems.

Can you all please post lspci output and your menu.lst?

** Changed in: grub (Ubuntu)
Sourcepackagename: dmraid => grub

** Summary changed:

- ALERT! does not exist at boot with fakeraid
+ "ALERT! does not exist" at boot with ICH7

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"ALERT! does not exist" at boot with ICH7
https://bugs.launchpad.net/bugs/106887
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