I to have a HTC desire and had problems with external memory finally after trying and trying to figure it out I went into my file manager app and transferd all of it to my SD card just select the boxes and click move then go to the SD card and select paste and it moves it all now I have all the space I need to download apps then of course after downloading I will move the app to SD card to keep my external space I hope it works for you guys as it did for me