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From David:
I am not sure what you want to acomplish working like that. Dual boot is usually to take advantage of features that the other OS doesn't have. I don't see any reason why to install 2 XP
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Ha. You live in good world, where WinXP works, has no errors, and you never have to reinstall or reformat! In my "chicken little" world, I live in fear that I will wake up and WinXP/drives won't be working and I'll need to do something NOW. In those cases, I'd like to be able to just switch OSs (From the BIOS) and move to my backup. This way I'd still be up and running and I could sort out the problems/restore later.

This has happened to me a couple times. And even though I run bootable RAID1, it isn't 100% redundant, either. If it is a HW problem, fine; but if you have a corrupt OS, then the corrupt OS is duplicated to both drives and the redundancy won't help you. I have not seen that stated directly, but that is my experience and it seems logical; correct me if I'm missing something. My solution: be capable of running two OS's. However, owing to my last failure, I questioned the wisdom of running duplicate OSs. I ended up with a corrupt NTFS.sys file and couldn't help but wonder if my duplicate OS's contributed to that. Pls also see my post to Conan, above.

Let me confirm: You have no problem running duplicate OS's on two different partitions? And you don't use "partition magic" or one of the other boot-loader programs? Presumably you install the two OSs, as I do, by disconnecting one of the drives and installing on the other?

Thx for the comments.

Scott