Re: Calling Grub in MBR on a USB disk from Grub on a primary disk probl
From:
Michael Evans
Subject:
Re: Calling Grub in MBR on a USB disk from Grub on a primary disk problem
Date:
Mon, 20 Jul 2009 15:14:37 -0700
What I've found is that modern PC BIOSes are increasingly trying to be too smart and thus acting even more stupid than they should be. It seems that they assume an old 1980s based operating system will be used and remap the devices such that whichever one is actually booting is the 0th and primary bios device. Your USB device -may- look like a floppy to the BIOS.
My suggestion is to install grub as a whole-disk setup on whatever device you want to boot from, and include a file on that device that you can search for. Boot off that device, find the file, and modify your device map accordingly.
Unfortunately you should not assume any other devices will remain constant, or even predictable.