When you try to start a mac off a hard drive from another mac model, it usually starts OK. But I guess each mac uses its drivers/extensions. How could I create a bootable OS X disk that is granted to be good for all mac models?. I thought a solution would be this: I start a mac using a disk from another mac model, then do the software update so it should download and install any missing drivers/extensions And so with different mac models till I've created a universal OS X bootable disk. ...am I right. Any suggestions?