Need to install 10.6 on a External Drive

Last night I asked for help on repairing the Boot Up Process that is defective with a B-Tree
He said to buy DiskWarrior and I agreed with him, for that program worked well in a previous boot up problem a few years ago.
My problem is this, DiskWarrior said that I would need to install the OS on a Thumb drive or a Hard Drive.
I chose to install it on a Hard Drive.
So, I bought a USB 4 port AC Powered for High Power Devices. So that I could connect to the single USB Port on the MacBook Air.
This is my problem, When I connect the DVD Drive DIRECTLY, I am able to boot of the INSTALL DVD 10.6 with no problem.
But, if connect the DVD Drive by way of the Powered USB. I am not able to see the Install DVD at all. For it will not even Boot.
How can I install the OS 10.6 on a Secondary Drive so that I can install DiskWarrior so that I can repair my internal Drive??
PLEASE HELP, I AM STUCK
robert
I tried using my MacBook Pro to try to install the OS from my MacBookAir, but that will not allow me.
Deeply appreciated for any help that I can get.

It is always wise to have a copy of your latest working system ... preferably on an external drive.   As Neil says, you may run into trouble and if you do you can always return to the original situation and start again.
Once you have installed Snow Leopard (an excellent system if I might say so) then you probably won't need 10.4.11 though you can never have enough back ups in my opinion.   It's amazing how often a need arises.
Having a backup on an external drive allays the need to partion your hard iMac drive for the same purpose..

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