question on udev device naming before root is mounted

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Can the device names for hard drives be forced before root is mounted
in so much so that udev rules can force via a device serial number to
be a specific /dev/sdX device name.

Looking at my pci and bios boot order I shouldn't even need to do this
but I think the defaults of udev or the sysfs?? are to move USB
devices to latter drive letters.

I am booting from a USB 16GB flash drive and would prefer the device
be sda but even if I could force it to be sdz, and force my sata
drives to be specific drive letters based on their serial numbers so
that I can create a hotswap raid array and be confident that once my
drives are installed they won't move around to different device names.
I think this information would be useful to a lot of people who have
simply given up in the past, and after weeks I was at the point of
giving up but Greg's email bot has given me one more ounce of juice to
keep trying. I really would prefer to not bother him directly but I
have a sneaking suspicion what I'm trying to accomplish isn't
possible.

I have this thread: http://ubuntuforums.org/showthread.php?t=2202219
on Ubuntuforums.org where I'm trying to find out if this is possible:

I really appreciate any help, and please forgive my demeanor in my
thread on the ubuntuforums page I have a personality that takes an
acquired taste.

If there is any information needed that I haven't provided in the post
at the link above please let me know and I would be happy to provide
it.
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