M4a87td-evo usb 3 does not find external drive

I have a new Seagate USB 3 2TB external drive. Partitioned it and installed Ubuntu 13.04.
When it is plugged into the USB 3 connection the drive is found by the file manager of my 'host' Ubuntu 12.04 system and works ok as storage but is not found by the computer when booting so I can't boot from it. It does not appear in the list of available boot devices in BIOS.
However, if I plug it into a USB 2 connection it is found. It appears in the list of available devices in BIOS, it can be booted from and works normally, but maybe just as a USB 2 drive.
The problem seems to be pointing at some BIOS setting, maybe.

I have an ASUS M4A87TD-EVO motherboard and X6 1055t processor.

Thanks, Theo
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More about m4a87td find external drive
  1. HI, Not using Ubuntu, but check the kyiop post here: http://ubuntuforums.org/showthread.php?s=77301f9951438c7831ce250a9748f4cb&t=1628665&page=2
    or search for similar on Ubuntu forums.
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