[X4U] Booting from external drive

[Thomas W Noel]

On Aug 14, 2007, at 4:02 PM, Jens Selvig wrote:

> I decided I wanted to be able to make a bootable external hard  
> drive for my MacPro. When I boot from the install CD, The Installer  
> software says I am not allowed to install on any of the Firewire  
> drives that are attached or the USB drive, either! I could install  
> OSX on the second internal SATA drive.
>
> Now, I am getting older, but I am not loosing my mind, (I HOPE) but  
> I do know that doing this on the G4-G5 computers was easy.
>
> Anybody have thoughts on what needs to be done.
>
> Jens Selvig
> ...lost in Montana...
Has to do with the Intel Macs needing a different boot  
method.Probably need to change the drive partition map to GUID. Boot  
from Install CD or DVD, look in Utilities menu for Disk Utility. Re- 
partition drive and check GUID under Options. The installer is  
actually more restricted in choices than necessary.
Another option is to clone a current boot-able drive to the external  
Firewire or USB2 drive with a copy utility such as SuperDuper.  
TechTools Protogo is another that can create a boot-able drive to CD,  
DVD or even an iPod.