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I have a system with two identical 1TB harddrives, where I image to a backup drive using the dd command. When I boot up, though, despite setting harddrive priority in the BIOS, the system sometimes boots the main drive, sometimes boots the backup. My system dual-boots Xubuntu and Windows XP, if that means anything to you.

Any ideas?

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Any connection between what boots, and what was booted last? – outsideblasts Jan 12 '10 at 2:59
No, there isn't. In Linux terms, I only ever want to be sda. So for example, I'll have sda booted, restart, then sdb will appear. So I shutdown and try again, which usually then works. – Zurahn Jan 14 '10 at 3:12
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are you sure it's the BIOS getting the the drives confused? Xubuntu's uDev could be assigning sda and sdb differently each time. especially since you're using dd to backup -- this would copy the partitions' UUIDs as well, so Xubuntu (and likely WinXP) wouldn't have any way to tell the drives apart. – quack quixote Apr 5 '10 at 3:17
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