Comment 8 for bug 45989

I have a similar problem and I think it is to do with assumptions that grub makes.

I have an IDE hard disk which should be hd(1,0)
I have a SATA hard disk which should be hd(0,0)
as the SATA disk has the MBR on it and the BIOS looks at this disk for an MBR first.

Every time there is an upgrade to grub or the kernel they get changed around and I have to manually edit the boot loader at boot else it cannot find the hard disk drive. Minor inconvenience for me.

Interestingly the IDE hard disk used to come up as /dev/hda but now it comes up as /dev/sda (Ubuntu 6.10 and before), the SATA disk coming up as /dev/sdb.

I don't know why this happens but I guess it has something to do with the way the kernel identifies drives. So basically, I'm thinking grub makes the choices it does because of underlying works in the kernel.

What I do to boot:
  - Selecting the option you want to boot
  - hit e to edit
  - change the hd(1,0)<>hd(0,0), hit b to boot.
This should work if its doing the same thing that happens to me.

If you need any more info feel free to contact me.