I own an HTC Sensation and have an 8 GB SD card in there right now. It says I only have about 650 MB(~8%) available on the SD card. I barely have any apps on my phone and have used the SDCard Manager app to see what is taking up the space, but I can't the things taking up all that space. I only have about 400 MB of music on this SD card so it can't be that. Am I missing something? Does SD card memory get taken up in some other way?