I have 2 hard drives on my Mac G5 - Can I have a different OS on each one?

I just recently installed snow leopard and lost the ability to use an older version of photoshop which was installed on OS 9 (classic). I just put in a second hard drive which I am using as my start up disk. I want to know if I can install OS 9 on the other hard drive so I can use my older programs.

Can I have a different OS on each one?
Yes, but your computer must still be capable of booting each OS.
I want to know if I can install OS 9 on the other hard drive so I can use my older programs.
No, but you can install Mac OS X 10.4 and use Classic through it.
(52050)

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