Firewire power for portable hard drive

I just replaced my hard drive on my Macbook Pro, and I bought a Tango Pro external enclosure (portable) from Acomdata to house the old drive. I want to use it as a backup drive for my iMac 800 G4 flat panel running 10.4. My Macbook Pro recognizes the external portable, but my iMac does not seem to have the power necessary through the firewire port (or the USB port, but I would like to use the firewire) to spin the portable. Is there a power issue for the iMac G4 flat panel with portable hard drives?

While an older Mac (PPC) can see and use an Apple Partition Map
(APM) and Journaled HFS+ formatting for a boot system, generally.
A newer Mac can see and use, to a degree, both kinds of partition
map schemes, especially on an external drive that may support a
clone or files to be (perhaps, if capable) used by more than one
Mac. So, by default, the newer Intel-based Mac would tend to put
its favored GUID partition mapping on at attached hard disk drive
in the process of setting it up for use; however it can also use the
older standard APM on an external drive.
Also, it is best when two computer systems are expected to use
a single external hard disk drive device, that the internal drive in
that unit be set up to contain more than one partition, and the
Disk Utility can be used to set that up, too. And when using two
sets of software to create projects that may not be compatible
under both different OS X versions, you can keep those apart
from each other in the external drive in their own place.
Not saying the total and full answer is to just use the best possible
partition map for the correct vintage OS X version, but to use one
that is compatible for both the newer & older, on the external HD.
And to change that mapping scheme would erase the drive.
And I am always open to someone who is more current and has
a great deal more recent experience in these matters, to reply
and set the course straight with a short, quick, workable answer.
Now, I have to go and see about helping someone get a pile of
old firewood from the backyard they were given two years ago.
Good luck & happy computing!

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