Bingo; thanks!
I didn't realize that the external HD would have MBR code on it, but I guess it was put there by fdisk? Perhaps I should zero out the drive and then just put a new disklabel on it without using fdisk first (if I understand FAQ sec 14.4 correctly, only i386 requires the use of fdisk first). Would that prevent the external HD from having any MBR code on it? Then I could go back to the old BIOS boot order (convenient for occasional booting from thumbdrives).
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