How can I select a different internal drive to boot from?

I have 2 drives (bay 1 and 2) that are both bootable.
I'm just wondering - at startup how do I get a choice of which drive to boot from?
Right now it is booting up with the drive in bay 2, but I want it to boot from the drive in bay 1 (I want to do this so I can completely erase the drive currently in bay 2 and use it for something else).
A basic one. I'm sure there is some startup key command that I should use that will let me pick, just can't figure out what it is....
Thanks!!

Press the Option key at startup, select the desired drive, and push the button with the straight arrow. To permanently change the setting, use the Startup Disk pane of System Preferences.
(30847)

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