Two versions of OSX on one drive

Hello
I have a question about installling two versions of OSX on a single hard drive.
I have a Dual 2Ghz PowerMac G5 running Leopard 10.5.8 as that is the last version that supports my Mac.
There is no way that I can afford to upgrade and I think I need a new hard drive pretty soon. So I was thinking about buying a new drive, partitioning it into two halves and putting the Leopard 10.5.8 on the first half and Tiger on the other. The reason I want to do this is so I can use some older software that stopped working under Leopard.
As long as I parttion the drive, is this okay to do? Will it work fine and not give me any performance issues?
Also, while I'm on this, is there any particular hard drive that works the best with PowerMac G5s? Since I can't afford a new Mac I want to do everything I can to get the best preformance. I've already got the maximum RAM fitted.
Thanks for any advice ;-)
Dave

Thanks for that guys :-)
Ralph, I was thinking specifically about an internal drive to put the OSs on. I think I currently have a Western Digital Caviar in there and a second one which I think is Seagate Barracuda.
With my Mac being so old I was wondering if there is one that works best with it or does it not make much difference? I have heard that with certain new drives, it may need jumpers on some of the pins to work with my Mac.
Kind Regards
Dave

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