Can I back up two users on one partition on Passport?

I just bought a 1TB WD Passport external hard drive for travel and in case my present 250 GB Passport fails. I'm in the process of formatting it for Mac.
I set it to format with only one partition even though we're a 2-Macbook household, and it's now too late to change that (Passport says I can't repartition it once the deed is done). My question: Can I put the entire contents of both computers on a single-volume external hard drive?
I've never used Passport on the other Macbook, but both are OS 10.6.8, so I assume it would be no problem to set up Time Machine on that one as well. However, since I've never actually seen what a hard drive with more than one partition looks like, I don't know if it's a good idea or not. I'm sure everyone involved in manufacturing these things is smart enough to figure out a way to keep the data from the two different hard drives from getting scrambled together on the Passport, but I don't know what else could go wrong. For instance, if everything is on one partition, would that mean the Passport somehow couldn't be used as a startup disk for one or the other (or both)?
Thanks for any suggestions. No rush--since the formatting itself takes 9 hours and Time Machine then takes at least another couple of hours, it looks like I have plenty of time!

Read this extract from the definitive Time Machine web site:
http://pondini.org/TM/4.html
Ciao.

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