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Whenever I boot my machine with an external drive plugged into the usb I get an error:

Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key

I've reviewed my boot order, but my bios does not list any USB boot options. How can I stop my motherboard from trying to boot to my external drive?

 MB: P4P800SE w/ AMIBIOS 1005 
 ext. HDD: FreeAgent 750gb
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1 Answer 1

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After I disabled "Legacy USB Support" in the BIOS, the system skipped USB drive detection and booted normally.

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