Detection of External HDD in bios not happening,Need help !

I am using the dell inspiron 5520, windows 7 os 64 bit, I want to change the boot sequence to the newly bought external hdd ie SEAGATE BACKUP PLUS DESKTOP DRIVE 4TB,i am trying to install OS into the seagate hdd,but i do not see the external hdd in the list when i go to the bios screen to change the boot sequence.but the seagate hdd gets detected when used or viewed through MY COMPUTER
Step by step guidance and quick response would be highly appreciated ,
thanks a lot in advance.
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  1. Best answer
    try plugging the external drive into a usb2 port.
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