Why doesn't my backup drive appear in the Startup Disk selection window?

I've been using SuperDuper! to backup my Mac HD to my internal Seagate drive. The Seagate is divided into Seagate1 and Seagate2. I backup to Seagate1. When I open the Startup Disk window from Preferences, only the Mac HD icon appears, highlighted, and a Network Startup icon. Seagate1 does not appear, although I've made it bootable while using SuperDuper!
I'm not on a network, as I'm the sole user of my computer at home. I am connected to the Internet via cable, but that shouldn't be a factor, I think. I don't know why the Network icon is there but Seagate1 but Seagate1 isn't.
Is there a way to make it so the Seagate1 icon appears in the Startup Disk window? As it stands if my Mac HD goes down, I won't have access to Seagate1 to boot the computer.
Would much appreciate any advice or referral to another source that could help me.

Something I learned re: partitioning w/ Disk Utility: Dave Nanian at SD! referred me to SD!'s FAQs, the 1st one dealing with my problem:
http://www.shirt-pocket.com/forums/showthread.php?t=5738
I told (email) him that the original partitions already showed APM, but I went ahead, anyway, following instr's in the FAQ. Notable in those instr's is to click on Options, which I may have overlooked originally. This time, when I clicked on Options, APM showed as the default in the window. I went ahead & proceeded, thinking, "Well, if APM is the default, why did I need to click on Options"?
So I raised the issue with Dave. Here's what he said: "Alas, no - it uses the existing scheme, which was likely MBR."
Lesson: When partitioning w/ DU, ALWAYS click on Options, even if APM is the default. I know DU directs this, but all I can think of why the original partitioning failed is that I did not do this. Any comments would be welcome.

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