Internal Storage of Epic 4G Touch?

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http://forum.xda-developers.com – I am using CM10 alpha5.3. I have a 32GB MicroSD card installed on my Epic4G Touch. However, if I turned on USB storage, I noticed two additional drives: one is 32G (of course it is my MicroSD), the other is 16GB. Does that mean, the Epic4G Touch has a built-in storage? My questions are: 1) If I use app2sd, what storage device will be used by default, 32GB or 16GB? 2) Can I format the internal 16GB drive? 3) I installed both ES File Manager & Astro File Manager in Android. However, ES File Manager does not recognize 32GB card. It only recognizes 16GB card as external SD... Astro File M (HowTos)