2257 Views 5 Replies Latest reply: Dec 27, 2006 1:26 PM by a brody
USB drives won't boot PowerPC Macs into Mac OS X. Some Mac OS 9 bootable Macs can boot off of USB into Mac OS 9, but the iMac G5 is not Mac OS 9 bootable.
Some USB drives are capable of booting Intel Macs, but only those with the right firmware. Firewire is much more capable at booting both Macs. There is also a firmware caveat with Firewire booting, which is discussed on my FAQ:
Be sure any such data is backed up elsewhere before you attempt to boot off such a drive.
Note, an Intel Mac will not off a PowerPC formatted drive either. The drive needs to be GUID formatted. This tip explains how to develop a dual boot system for Intel and PowerPC:
You might be able to find out which USB drives are capable of booting Intel Macs on this website:
Thank you for your answer, but we are talking about two different things.
I just want the mac to recognize the drive when the USB cable is allready connected before the machine is switched on.
The drive only works when it is connected later when OSX is allready running, no icon in the finder otherwise.
I am not trying to boot from the external at all.
Some third party bus drives need extra power to be recognized after the machine wakes from Energy Saver. It would suggest, the low power of being off has the same trouble with this drive. I'd contact the manufacturer and ask them to find out Apple's specs for being recognized at boot for bus powered devices.