Can I re appropriate my running drive to...

Hello everyone. I have ran into a little situation. I need more space on my runnning drive. I have to internal harddrives but one of them is only 80gigs the other is 250gigs. I need to install Logic Studio but my running drive only has 2.5 gigs of space left. Is there a way to install this program onto my 2nd harddrive or appropriate the second harddrive as the running drive and if I can do this will it affect the software I currently have installed on the current running drive? Anyhow, I know this sounds confusing (or at least it does to me) but I would appreciate any input. 2 other options I've been entertaining were to swap the internal drives around making my running drive the drive with the most space but I'm not sure if that will effect the software and system since this is the drive I have all my software including Mac OSX operating system on. The last option was to erase everything I don't need on the drives but I don't think that will be enough space considering Logic studio needs like 45.1gigs of free space. I guess what I'm trying to do is make my 250gig internal drive the bootable drive but I'm not sure if I have to reinstall all my software on that drive. Anyhow just looking for ideas. Thanks
Erv

Now this link that you provided in your response will provide instructions on how to accomplish this task?
It has help files, but we're here also.
My number one concern is that I will have to reinstall everything from my bootable drive to the drive that I will make my bootable drive.
Shouldn't have to reinstall anything at all.
So I can't afford to lose any files.
The only way you'd lose files with this method is forgetting to UNCHECK that "Erase Target Disk" button, or if you have older files on the little HD that were in the same location/folder as newer ones on the big drive... example...
old drive has folder called "FCP projects" new drive has the same folder in the same place, the new ones would get replaced with the old ones, so you'd compare directories and rename the old ones or just move that/those folders to a folder on yhe old drive called "OLD" or such.
Here's a picture...
http://web3.ehost-services.com/bdaqua/old/CCCpic.tiff
The absolute safest would be to get another 500+ GB drive, pull your pesent 500, clone your 80 to the new blank one, put the just cloned one in place of your 80, put the old 500 back in.

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