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Re: can't start up with FW drive



On Jan 11, 2007, at 2:30 PM, Jerry Goedhart wrote:

On Jan 11, 2007, at 1:31 PM, Laurie Yalem wrote:

At the beginning of the school year we bought some Intel minis for a lab.
I took one of our firewire drives, reformatted it and put the Intel Tiger
OS 10.4.6 on it that came with the Minis. That enabled me to use
NetHelper/Restore to make a golden image of one of the minis. I've run
SWupdate and updated these minis and want to make a new image, however I
can't. I can't start up from the Firewire drive. I've tried holding down
the c key, choosing the 10.4.6 system to start from within Syst Prefs, but
it only boots to the mini which now has 10.4.8. Does anyone have a clue
as to why this won't work? I thought it might be because the Firewire
system is older than the minis, so I tried to download and install the
SWupdate 10.4.8 onto the FW drive, but it won't let me choose that as a
viable place to install the update. Any help would be appreciated.


:) Laurie

Laurie,

Have you tried holding down the (Command, Option, Shift, Delete) keys on startup? This key combination should work for firewire connected drives. The c key is intended for starting up from the CD drive. Also holding down the Option key on startup gives you the option of any valid system on your computer or any drive that has a system on it that your computer can boot from.

Jerry Goedhart
Tech Support
Orange City Christian School
Orange City, IA

As I posted earlier, this is an issue in that the Intel Macs use a different partition scheme for boot devices. Here is the key part from the article on TidBITS:
The Intel-based Macs are the first Macs to use Intel's Extensible Firmware Interface (EFI). Originally intended to replace the PC's aging and unloved Basic Input Output System (BIOS), EFI has found its way into the new Macs, taking over for Open Firmware in PowerPC-based Macs.


Tagging along with EFI is a new partition scheme: GUID Partition Table (GPT); GUID itself is an acronym, expanding to Globally Unique Identifier. GUIDs are locally generated, world-unique random numbers, which make them handy for uniquely identifying all kinds of things without a centralized organization or database. GUIDs are a great way to identify hard disk partitions, enabling the operating system to track volumes even if the device interface changes (as would happen if you ripped your old hard drive out of your Mac and tossed it into a FireWire enclosure).

GPT replaces Apple Partition Map (APM) as the boot partition scheme for Intel-based Macs. And therein lies the rub. Intel-based Macs can't boot from older APM drives, and PowerPC-based Macs can't boot from newer GPT drives. This appears to be a permanent situation - each scheme makes incompatible assumptions about the layout of physical block 1 on the disk. While GPT was designed to be compatible with Master Block Record (MBR, the PC's old partition scheme), it doesn't play nicely with APM.

---

Eric
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References: 
 >can't start up with FW drive (From: "Laurie Yalem" <email@hidden>)
 >Re: can't start up with FW drive (From: Jerry Goedhart <email@hidden>)



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