How to force boot from an external disk

My main start up disk has crashed. I have made a cloned disk using Super Duper that I have checked recently and the computer will boot from it. I also have another OS 10.6.3 on another internal disk.
I now want to boot from the cloned disk but the computer always defaults to the internal disk. I have tried using Start Up Disk in sys preferences. I have tried starting up with the option key held down.
Is there anything I can do to force the computer to start from the clone disk?
One other thing, I installed a 1TB Western Digital Caviar Black drive to replace the crashed start up disk but Disk Uitility won't initialize it.
The computer is a 2007 Xeon quad core on OS 10.6.8.
Thanks

I got this, I think I did it right, not much into the terminal
Last login: Tue Dec 20 01:10:54 on ttys000
[Mac-Pro:~] Jon% nvram -p
efi-boot-device          <array><dict><key>IOMatch</key><dict><key>IOProviderClass</key><string>IOM edia</string><key>IOPropertyMatch</key><dict><key>UUID</key><string>7952C499-9C5 2-4D3A-A1CE-DA650BD0EEA0</string></dict></dict><key>BLLastBSDName</key><string>d isk0s2</string></dict></array>%00
prev-lang:kbd          en:0
boot-image          %02%01%0c%00%d0A%03%0a%00%00%00%00%01%01%06%00%02%1f%03%12%0a%00%01%00%00% 00%00%00%04%01*%00%02%00%00%00(@%06%00%00%00%00%00%e0%1f.:%00%00%00%00%99%c4RyR% 9c:M%a1%ce%dae%0b%d0%ee%a0%02%02%04%04%1a%006%00f%009%000%00b%000%00b%000%000%00 0%00%00%00%7f%ff%04%00
platform-uuid          %00%00%00%00%00%00%10%00%80%00%00%17%f2%02%a5p
BootCampHD          %02%01%0c%00%d0A%03%0a%00%00%00%00%01%01%06%00%02%1f%03%12%0a%00%01%00%00% 00%00%00%7f%ff%04%00
efi-apple-payload0          <array ID="0"><dict ID="1"><key>BLLastBSDName</key><string ID="2">disk0s1</string><key>IOMatch</key><dict ID="3"><key>IOProviderClass</key><string ID="4">IOMedia</string><key>IOPropertyMatch</key><dict ID="5"><key>UUID</key><string ID="6">00007608-5456-0000-5118-000032640000</string></dict></dict></dict><dict ID="7"><key>IOEFIDevicePathType</key><string ID="8">MediaFilePath</string><key>Path</key><string ID="9">\EFI\APPLE\FIRMWARE\LOCKED_MP11_005C_08B.fd</string></dict></array>%00
SystemAudioVolume          -
efi-apple-payload0-data          %02%01%0c%00%d0A%03%0a%00%00%00%00%01%01%06%00%02%1f%03%12%0a%00%00%00%00% 00%00%00%04%01*%00%01%00%00%00(%00%00%00%00%00%00%00%00@%06%00%00%00%00%00%08v%0 0%00VT%00%00Q%18%00%002d%00%00%02%02%04%04\%00\%00E%00F%00I%00\%00A%00P%00P%00L% 00E%00\%00F%00I%00R%00M%00W%00A%00R%00E%00\%00L%00O%00C%00K%00E%00D%00_%00M%00P% 001%001%00_%000%000%005%00C%00_%000%008%00B%00.%00f%00d%00%00%00%7f%ff%04%00
efi-boot-device-data          %02%01%0c%00%d0A%03%0a%00%00%00%00%01%01%06%00%02%1f%03%12%0a%00%00%00%00% 00%00%00%04%01*%00%02%00%00%00(@%06%00%00%00%00%00%e0%1f.:%00%00%00%00%99%c4RyR% 9c:M%a1%ce%dae%0b%d0%ee%a0%02%02%7f%ff%04%00
boot-args
[Mac-Pro:~] Jon%

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How do I boot from an external drive?

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jamesfromcanogapark wrote:
ive have tried to press option to boot Leopard from a USB external drive. This does not work, it just takes me back to Tiger..
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Message was edited by: chris92410

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How to force boot from an external disk

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