AppleTV, iTunes and Multiple Disks I have a 20 iMac and an AppleTV 2 (the black one), and three external drives (2TB, 1.5TB and 1TB) that house all my music, movies and tv shows.
Up until now, I've never needed more than the one drive for everything, but now my 1.5TB drive is almost full and what I'm doing to keep things organized feels like a cludge so I'll just explain what I'm doing and hopefully someone will tell me what I'm doing wrong and how to fix it.
Right now, I'm using the 1.5TB (music, apps and tv shows) and 2TB (movies) for my media. After I've converted, tagged, etc. all my new shows or movies, I change the preferences in iTunes to the drive that contains whatever I'm about to add to the library. For example, if I'm going to add a new movie, I switch the "iTunes Media Folder Location" to the 2TB drive, add the movie, then change the preference back to the 1.5TB drive.
This just seems silly to me, and I know I could create a RAID but I don't want to move all that data around so there has to be a better way to do this.
What I would do is:


Have only 1 library
Make sure that iTunes is configured to keep all your media organized (and point your single iTunes Library to your preferred disk)
When adding files to your iTunes library hold down Option/Alt to let iTunes know that it shouldn't copy the file to where your library is


This way all your data will be organized by iTunes except for the large files that should belong on your largest external disk in the first place.

Cheers...