Makes sense, I assume this is something that it would be best to setup on an Intel-based Mac first? Then move to the PPC-based Mac to install on the second partition? I'm asking as I seem to recall something in the disk formating options on recent versions of the OS. Seems simple enough. I take it the dual boot DVD's such as 10.5 or DiskWarrior work this way? Zane > > Yes, but in order to do so, you must partition the drive into at least > two partitions. You will need one for the intel and one for the PPC. > The two formats are different and neither type computer will boot to > the other normally. > > You will need to install the OS on each partition with the > corresponding computer type for its partition. > > I used an old 40 GB drive set up like this to create myself an > emergency boot and utility drive for my Macbook and PPC Macs. I > installed Leopard on on partition for the Intels and installed Tiger > on the other for the PPCs. I also installed various utilities like > TTpro 4, Drive Genious, DiskWarrior, and etc, on it. > > > > 3 > > > > On Oct 3, 2008, at 2:45 PM, Zane H. Healy wrote: > > > > > Is it possible to install Mac OS X on an external Firewire HD such > > that you > > can boot either a PPC or an Intel-based Mac? I want to build a new > > utility > > disk that I can use to boot any of my families Mac's and run various > > utilities against them. > > > > Zane > > > > _______________________________________________ > > X4U mailing list > > X4U at listserver.themacintoshguy.com > > http://listserver.themacintoshguy.com/mailman/listinfo/x4u > > > > Seven Cent Deals - Great legacy stuff Great Legacy Price > > http://www.drbott.com/prod/db.lasso?cat=Seven+Cent+Deal > > _______________________________________________ > X4U mailing list > X4U at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/x4u > > Seven Cent Deals - Great legacy stuff Great Legacy Price > http://www.drbott.com/prod/db.lasso?cat=Seven+Cent+Deal >