Duplicate Startup Disks in boot menu

I have two ssd drives, one in optical bay and one in standard hd bay. I have a clone of Yosemite on both drives. When I boot and gold down option key to bring up boot menu I am seeing duplicate entries for one of my startup disks. So instead of two startup disks to boot into, I see three. How would I
go about removing the duplicate?

Thanks. I had actually tried that with the boot mode set at UEFI and it didn't work, but I gave it another try set at legacy and it works fine.
The documentation for this seems confusing to me, though. Isn't this RAID card considered a mezzanine card? The documentation here says to enable the onboard controller to get a mezzanine card to work:
http://www.cisco.com/en/US/docs/unified_computing/ucs/c/hw/C200M1/install/RAID.html#wp1016766

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