Can Tiger be installed on the same disk running Leopard?

I purchased a retail Tiger disk after I started having problems with Leopard 10.3 -- now solved, thankfully. Still, I hear that Tiger is great for Audio, my primary use, and so would like to at least find out how it feels.
So...I created a GUID partition (Extended Journaled) in hopes of being able to install Tiger on my Leopard MacBook. No go. When I boot up holding the option key, only my Leopard Drive and Boot Camp drive appear: the Tiger Drive does not. When I try to install from the disk directly on my desktop, I get a message saying that "Mac OSX 10.4 cannot be installed on this machine."
It has been suggested to me elsewhere that in order to install Tiger on this MacBook (rev. 3,1), I would need to downgrade the firmware to something circa Tiger. I can run either Tiger or Leopard, but not both. Can someone confirm whether this is true?
If so, I'm thinking I'll buy an external firewire drive and try loading it on that. In this case, would I get better performance from a retail external hard drive over against, say, transferring my original 80 GB MacBook hard drive to a FireWire case? (I've since upgraded from the 80 GB in my laptop.)

Hi fizay
I created a GUID partition (Extended Journaled) in hopes of being able to install Tiger on my Leopard MacBook. No go. When I boot up holding the option key, only my Leopard Drive and Boot Camp drive appear: the Tiger Drive does not. When I try to install from the disk directly on my desktop, I get a message saying that "Mac OSX 10.4 cannot be installed on this machine."
Since you created a GUID partition, I will assume you have an Intel Mac. This means that you can only install Tiger on the Mac if is an older model. The newer model which are coming with Leopard installed will not run Tiger. In order to install Tiger on an older Mac you will need to get the old Tiger install media for the same model in order to install Tiger. The reason for this is the generic Tiger disks only have PPC code on them and are worthless for an Intel Mac.
It has been suggested to me elsewhere that in order to install Tiger on this MacBook (rev. 3,1), I would need to downgrade the firmware to something circa Tiger. I can run either Tiger or Leopard, but not both. Can someone confirm whether this is true?
It is not true. Firmware cannot be downgraded.
If so, I'm thinking I'll buy an external firewire drive and try loading it on that. In this case, would I get better performance from a retail external hard drive over against, say, transferring my original 80 GB MacBook hard drive to a FireWire case? (I've since upgraded from the 80 GB in my laptop.)
Putting the old drive in an external enclosure will be a good thing to help you spread the I/O workload out across more disks but it will not help get Tiger running if you Mac came with Leopard.
Allan

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