Have multiple iTunes libraries on one machine?

Hi,
I want to have multiple iTunes libraries on one machine (with two different hard drives, internal fore mp3s and external for AAC files). One library is composed of mp3s for an iPod, I want the other library to have AAC audio files for burning CDs. I would rather the libraries not be mixed.
I have read the article (#301748) for migrating an iTunes library and am preparing to migrate one of the libraries on to a external hard drive.
I have read about using Libra to maintain two different libraries on one machine. I was wondering if anyone does this and if they have encountered any problems? Is there a better solution?
Thank you,
TPK

It's one thing to want two music libraries on one machine and another to want two music libraries on one user account. For the latter, here's what I've done.
I created folders in my iTunes folder called, say, Main Library Folder and Second Library Folder. (These could be anywhere you find convenient.) I dragged my regular iTunes Library file into the Main Library Folder. Then I opened iTunes and created my second music library. When I finished that, I closed iTunes and dragged the just-created iTunes Library file into the Second Library Folder.
If I want to use my main iTunes library, before opening iTunes I drag an alias (Cmmd-Option-drag) of the iTunes Library file from the Main Library Folder into the iTunes folder. Then, when I open iTunes, iTunes reads my main library file. And of course, it works the same way for the second library.
Of course, you could just shuffle the actual library files into position in the iTunes folder from their holding areas, but I strongly preferred to get myself into the habit of relying on aliases, so I could leave the actual library file alone in their respective folders. You most definitely would not want to accidentally overwrite one of your iTunes Library files.
I'm sure one of the shareware products would do a more elegant job, but this just shows you that it's not a difficult process.
The alternative is to set up separate user accounts to access different libraries on the same machine. This has real benefits and, to me, should be the first option one considers. It's easier on the brain, as it sticks to iTunes' one-user-one-library model, and there's absolutely no risk of getting libraries confused. Fast User Switching on the Mac makes going back and forth between accounts easy. But if you really want to avoid using different accounts, and it's only you that has to keep things straight, the approach of jumping back and forth between different libraries in the same user account should be OK.

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