Boot from external usb2 hard drive?

I am sure this has been covered many times ,but after a brief look through other posts I can not find a definitive answer. I bought a usb2 external hard drive ,to make norton ghost backup's ,but as the hard drive is not seen as a boot device I can not make NG see it, I  have tried making the drive active with partition magic ,but still does not show as a boot device. Strange because I am sure at one time I had a usb to ide converter working with NG.
thanks Brian UK

You need to go into the BIOS and turn Lagency USB support on.
Then reboot, and you normaly are able to select it for booting as well.

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