Using a single ext drive for both Snow Leopard and Mtn Lion?

I still have no iOS device (gasp), and I frankly don't like the differences I keep reading about the iOSsy Mtn Lion, as contrasted with Snow Leopard (on my 08 MBP). But yeah, I know I have to make the jump eventually. Meanwhile  I'm thinking of getting a new 2TB external drive, creating a 1TB partition for each system. (The present Snow Leopard drive is about 740GB). That way I can get to know Mtn Lion while I still have the long-term tried and true personalized folder hierarchy in Snow Leopard—until I'm ready to give up SL completely.
(I know I could just put Mtn Lion on the external; I prefer two partitions simply for the convenience of adding another external backup for the SL system.)
Does this make sense? Does it seem practical? I welcome any suggestions or concerns. Thanks.

Yes, you can partition any drive into two volumes and install Snow Leopard on one and Mountain Lion on the other. If you don't yet have Mountain Lion then you need to install Snow Leopard on both partitions to start. The volume on which you will put Mountain Lion needs to be updated to 10.6.8. Download and install Mac OS X 10.6.8 Update Combo v1.1.
You can then run the App Store application to purchase and download Mountain Lion to install on this volume.
To save time you do not have to install Snow Leopard on the volume being used for Mountain Lion. But you will need to install it on the other volume so you can get the Mountain Lion installer unless you already have it.
Purchase and download Mountain Lion. When the Mountain Lion installer opens click on the Install button. Select the Other disks link in order to select your blank volume, then click on the Install button to put Mountain Lion on the blank volume.

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