Details needed for using two hard drives with one iTunes library

I posted this under the iTunes section but now that I think of it, it's more of an Apple TV question since I'm only concerned about how it affects my 2 ATVs.
I have a MacMini(G4) that acts as a media server for our 2 ATVs. I use one library on the Mini which has been using an external 750GB drive. However, I'm at nearly 95% capacity now and want to invest in another external drive and use both. So the question I posted on the iTunes section was...
"With far too much content in iTunes (mostly for the Apple TVs) and after reading numerous posts about using external hard drives with iTunes I'm convinced that using two external drives is my best solution.
However, I did want to understand a bit more about the details of how iTunes will manage or at least keep track of, the media. Specifically, I'm thinking of the case were I add a movie to iTunes library (of course it will not copy the file into the iTunes folder).
What will occur if I later change any of the tags for the movie (e.g., name, genre, year, etc.). Will iTunes update this information and then update the Apple TVs once they resync with the iTunes library?"
So for the very knowledgeable folks here on the ATV section, what exactly does iTunes do in this case? Will my genres be updated correctly if I change something even though the content is not copied to the iTunes folder?

If you want to use two external drives to store your itunes content, there are a couple of ways you could go about it.
You could choose to have just movies (for example) on one HDD and everything else on the other. You could further choose to have your itunes music folder on one HDD and have all content copied to it by default. When it comes to movies (in this example) you can place these on your second HDD and add them to itunes by using OPT-drag, which will temporarily disable itunes from copying the file to your itunes library.
You could also entirely disable disable itunes copying files to your itunes music folder from the itunes preferences and manually manage all your content.
Personally I'd just buy a 2 TB (for example) drive and ebay your old drive once you have moved everything from it to your new one.

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