I have a 32 GB SD card added into my A100, and it shows up great over USB, but I can't seem to access the contents through regular apps. The Settings/storage page shows the card, and that it has 11GB full, 19 GB free, but doesn't show any internal directory structure. Apps like ES file explorer show /sdcard/ but that is the internal card (only). The gallery (photo) app does show things I put into the /photo/xxx folder on the SD, so that works fine. But I have a lot of other stuff, mp3 music, ebooks, pdf's, etc, and don't know how to get to them.