How do i change so that the HDD currently being used for Time machine becomes the startup disk?

Hi there,
I bought this mac with 2 HDD's (a 250gb and a 2tb). When I booted up the mac for the first time, I accidently chose the 2tb HDD as the time machine.......thing so this makes the 250gb HDD the startup drive. This is useless for me as I only want the documents to be backed up so I want the 250gb drive to be the time machine and the 2tb to be the startup drive.
I've tried opening the Mac OS X installer and it doesn't allow me to set the start up drive to the 2tb drive as it isbeing used for the time machine and i've already turned it off within the system preferences.
Please tell me it's possible to switch them around other-wise this will just be a wasted purchase completely. I already accept the fact that I may have to wipe the drive and re-install everything as well as the documents etc but as long as I get some sort of solution that will allow me to do this.
Can someone please help me with this!
Regards
Eric Wade

Copy off everything you want, restart from the iMac's original disk, choose Disk Utility from the Utilities menu, wipe drives as desired, and then install the OS.
(58930)

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the loc-man wrote:
so you can pick and choose what backup? eg Music, Pics, Docs, emails etc?
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Go step by step and test.
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   http://support.apple.com/kb/PH13806
3. Disk space / Time Machine ?/ Local Snapshots
Local backups
   http://support.apple.com/kb/ht4878
4. Delete old iOS Devices Backup.
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http://support.apple.com/kb/TS2986

How do i change so that the HDD currently being used for Time machine becomes the startup disk?

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