External 'boot disk' for G5 won't boot

First attempt was to make an OS 10.5.? boot disk from the installation DVD. The second attempt was to use Carbon Copy Cloner to make an exact duplicate of the internal Boot Macintosh HD disk. Both onto one of a pair of external 4Tb Iomega drives. Connection is Firewire 800 daisychain. The external drive in question is the last in the daisychain. The G5 has twin internal drives already and the G5 will boot happily from either. (One is 10.5.8, the second is 10.4.11/Classic.)
Both installations attempts on the #2 4Tb drive appeared to "work". The now CCC version is an exact copy of the main internal drive and is OS 10.5.8. 'Startup Disk' appears to recognise it as a system boot disk. I can select it for booting on restart but it fails to do so and eventually finds the main internal drive after some wait.
Holding down the Option key as you restart the machine brings up just the two choices of the two internal drives to start from - no external drive choice.
This all used to work just fine in the days of SCSI...
I'm presuming altering the order of the external drives on the Firewire chain won't make any difference?

jsd2 wrote:
Both onto one of a pair of external 4Tb Iomega drives.
I wonder if such a drive is just too big to boot a PPC Mac.
Hmm. Interesting thought. You have a good point.
I just found this technote:
*Secrets of the GPT*
http://developer.apple.com/library/mac/#technotes/tn2166/_index.html
It contains the following regarding the Apple Partition Map scheme:
APM is restricted to 32-bits worth of blocks. With a standard block size of 512 bytes, this translates to a maximum disk size of 2 TB.
In Disk Utility, if you again click on the upper icon as before, and look again at the lower right of the window, what does it say for "Total Capacity?" Does it report the full 4TB?
It reports the full size - strictly it reports 3.6Tb - ie well over 2Tb.
(I do have the hardware option of switching to twin 2Tb on these 4Tb Iomega drives and strictly, that is what is inside the physical housing. It's a matter of throwing some switches. Of course, I don't actually want 2Tb drives. )
MacBook Pro (10.5.8) Power Mac G5
It might be of interest regarding the capability of the drive enclosure hardware to connect the drive to your MacBook Pro, repartition it as GUID (which will erase it), install OS X on it or clone the MBP to it, and then see if the MBP will boot from it.
Hmm. I don't think I want to do that as the MBP is an Intel machine and the G5 isn't. It won't solve the actual problem. (At least I can't see how it will.) Though I see what you are getting at.
It's probably worth a shot emailing Iomega, I guess.

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Please find the link given below might be helpful for your.
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"I work for HP."
****Click the (purple thumbs up icon in the lower right corner of a post) to say thanks****
****Please mark Accept As Solution if it solves your problem****
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Message was edited by: Hellstan

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http://docs.info.apple.com/article.html?artnum=42642
and after that reset PRAM in your unit, here is the kbase:
http://docs.info.apple.com/article.html?artnum=2238
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Flippo

External 'boot disk' for G5 won't boot

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