Backing Up Two Drives To One External Drive

Hello!
I own a 20-inch 250GB iMac, a 1TB Western Digital External Hard Drive, and a 320GB Western Digital External Hard Drive. I recently began running out of room on my Mac, mainly because of all that I have on iTunes. Out of my 250GB I am now down to about 18GB. With this in mind, I went out and picked up a 320GB drive to pluck all my iTunes fluff on.
My 1TB drive is my current Time Machine backup for my Mac. I have been using Time Machine for quite some time and haven't had much problem at all. Today, though, is where I hit a stump. I'd like all my iTunes files to be only on the 320GB drive, and to be backed up on the 1TB drive. I also want my 250GB Mac to be backed up on the 1TB drive as well.
So my question is, can I have a Mac and a 320GB External Hard Drive both be backed up to the same 1TB External Hard Drive with the use of Time Machine? If so, do you mind explaining how exactly this would work? I tried looking at the Time Machine settings thru System Preferences, but I had no luck with my hunt there.
Any help would be appreciated!

dj22091 wrote:
Thank you for the reply. I have just a few more questions if you don't mind. [:-D
Will leaving the volume format as MS-DOS (FAT) be an issue?
yes, it will. as i said, the drive must be formatted mac os extended for TM to back it up. also, FAT has manyother deficiencies with OS X and should not be used unless you absolutely have to.
My 1TB drive is formatted as Mac OS Extended (Journaled)... Seeing as how this is only for iTunes, should I change the volume format for this new drive? And if so, for erase options, should I choose "Don't Erase Data" or "Zero Out Data"?
do not choose the zero out data option. this is just a security measure to prevent data recovery. it's quite useless with a new drive and is mostly waste of time anyway.
I ask because this new 320GB drive came with that icky SmartWare Software already installed. I followed the steps @ http://www.wdc.com/wdproducts/updates/?family=wdsmartwareutilitiesmac to remove this software, so my paranoid side is left wondering.
Also, for future reference, do you mind explaining the hierarchy here @ http://twitpic.com/14gva3 ? This is an image from my Disk Utility, and I am wondering what is the difference between the "232.9 GB..." and the "Macintosh HD", as well as the other two drives shown. I ask because, if having to format, should I worry about the "297.4 GB..." or the "disk2s1"? (MATSHITA DVD-R UJ-875...Do you have any idea what that is?)
everything in this pic is absolutely normal. the top one is the whole physical drive. it may have several partitions which are separate volumes and can be formatted separately. but none of your drives are partitioned.
Thanks a lot for your help!

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