Can't Boot a 1.83 Dual Core Mini from UBS 2.0?

Hi All,
I have a 1.83 Dual Core Intel Mac Mini and I am trying to Boot the machine from a USB 2.0 Drive.
Startup Disk sees it and lets me select it, but everytime I try to start from the USB Drive, the machine just automatically bypasses the USB Drive and always boots from the Internal Drive.
Someone mentioned that Intl Mini's *CAN ONLY BOOT* from drives formatted as "GUID PARTITION TABLE", is that correct? If so, I find that curious, because the same external drive was cloaned from and can boot an 2.26 Intel Dual Core 15 inch Mac Pro, so I figured that it should be able to boot a similar vintage Intel Machine.
Just for information: when you hold down the "option" key at startup, the USB drive (formatted as "Apple Partition Map") is not even presented as a Startup Option.
Any help would be greatly appreciated!!
Thanks
Kalagan

Hi Kay,
Thanks for the info, but one curious thing has come out of this. When my external drive was connected to the Intel Mac Pro via Firewire 400, I could boot the Laptop from the external Firewire Drive even though it was formatted as "Apple Partition Map", but the same drive connected to the same computer would not boot the machine when connected via USB 2.0.
So, it looks like Intel Macs don't require GUID Partitioning to boot, if you are connected via Firewire, but they do need the GUID Partitioning scheme when you are trying to Boot from a USB 2.0 drive??
Interesting??
Thanks
Kalagan

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