I have the HTC sensation from Cincinnati Bell and i moved all of my pictures from my SD card to my computer and it still says that my SD card is full. It won't let me take any pictures.
There are 2 "SD cards" - an internal simulation of an SD card, which is the main "SD card" and an external SD card, which is the real one tht you can put in and take out, Most cameras store to the internal card, so no matter how much data you remove from the external card, if the internal "Card" is still full, you cn't take any more pictures. (I think "internal simulated SD card" is one of the more stupid misuses of language I've ever heard.)