Where can I find the files using up my external hard drive?

I have a 1TB iMac and have two external hard drives attached to keep the computer free of hard drive use for two reasons: Disk 1-is a 250GB hard drive I have dedicated to perform Time Machine backups of my home folder. Disk 2-is a smaller 120GB hard drive I keep my compete iTunes library of music in case the computer has a malfunction, so all the work I've done putting the library together will be secure. Here's the thing...the iMac's hard drive is hardly used, just as I want containing about 150GB total.  Meanwhile, the Time Machine disk is nearly full with  225GB used, and just 25GB remainibg. The hard drive with the iTunes files looks pretty good too using about 70GB of it's 120GB.  I believe Time Machine is in no way, backups the iTunes library just the iMac.
How can I figure out where the additional space is getting used up on that disk?  I do have a couple of extra logins I use for alternate use such as a different iPhoto library I want kept seperate from mine, but I did not think the backup was saving those files as they are not even under the Time Machine setup.
Can anyone advise why the backup is larger than the use of the computer?  I knew when I dedicated a smaller hard drive to back up a larger one that it was possible the backup drive would get too full, but I can figure out what's happening. I've erased the Time Machine disk and allowed it do a completlely new backup and again, it's always sigificantly larger.
Thanks!

Okay...I have some more information and perhaps we are getting closer.  On the 250GB, first I went into that disk and used Disk Utilty to re-format it once using Mac OS Extended (Journaled) then a second time, zeroing it out. I did a screen shot to review if needed, and both times it looked perfect...249GB available.  Then I went into the Time Machine preferences to get ready to backup again, and it had not excluded the other external 120GB with iTunes so I excluded it. I may has previously, never noticed in that screen that it takes a bit of time for it to calculate the information to save.  I may have just clicked on it quickly without reviewing it first.  Today I did, and gave it time to calculate.  At one point the actual 250GB itself, showed up and I excluded it too like the 120GB.  After it finished, the calculations are still it wrong - claiming it has a 200GB backup when the iMac either contains 150GB (based on when I do Get Info) on it or from OmniDisk which calculated about 100GB.  I have not allowed Time Machine to do a backup yet, until this discrepancy can be clear.
One thing that I thought I had seen or reviewed previous on the Time Machine settings was my home folder - I could be wrong but wanted to mention that.  Another little tidbit to ponder an well is that I have a files of icons that I use for the Hard Disks, and a few folders where I Get Info on the Icon and on the destination and just cut and paste.  I did that today to the 250GB after zeroing, but while I was in the Time Machine settings the change was deleted and neither the manufactures icon was there nor mine, and it has the default blue-green one the software uses.  I know, because my sister's is that way on her system-unchanged.
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