Only "EFI boot" appears for my external drive

I bought a 4TB Seagate USB 3 drive, designed for Macs.
I changed the partitioning so it is as follows:
1st (with the Seagate files) 2.5TB
2nd 500GB called "Backup"
3rd 1.5TB called "Data"
I used Carbon Copy cloner to backup my internal drive to the 500GB partition--CCC said the drive would be bootable. When I open Preferences/Startup Disk the "Backup" parition shows up as an option.
But when I Option boot my mac, I only see these choices:
Macintosh HD
OS X 10.9 Recovery
and then indicating a USB drive:
"EFI Boot"
My "Backup" partition is not listed.
When I tried clicking "EFI Boot" my Mac just freezes.
Is my "Backup" partition too far into the drive (starting at 2.5TB) to actually be listed properly in startup?
Thanks!

Followup: I made a bootable copy into the 1st partition, and that one showed up first with its full name, followed by "EFI Boot". I discovered on trying to boot from #1 that it seems as if the Mac has frozen but it takes quite awhile to actually boot, but it did. So then I tried booting from the second one, and that eventually worked. So I guess the only issue is the weird name.

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. http://www.macfixitforums.com/postlist.php?Cat=&Board=Forum38 "How to make a triple-boot service drive"
. http://www.micromat.com/index.php?option=com_simpleboard&Itemid=42&func=view&cat id=7&id=786
We are discuss the boot capability of external drives and I wish someone can clarify this question to isolate software (include cloning software) or hardware problems.
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Only "EFI boot" appears for my external drive

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