Good Morning to all!

My name is Alex. I have always wanted to try Backtrack 4 Final to test out my local network, but this week, I decided to download it and install the live CD to my two gigabyte thumb drive. All went well as I typed in "Startx" and what not. Right when I wanted to install backtrack on one of my partitions, the program did not allow me to select an option. Ubiquity did only list /dev/sda, but did not list any partitions under it. What should I do. I only have experience with Ubuntu as it is my current primary OS.

Thank You and I look forward for help!

Another note:
I really love the OS guys! Great Job!