Often these days, when I open the camera on my Nexus One, it says "Your SD card is full" and won't let me take pictures (boo hoo). When I go into "Settings" and then "SD card," it says the total space on my SD card is 3.69GB, and the total available space is 3.62MB. I have no idea what is taking up all the space. I do not have that many apps, and they are all on the main system card, not the SD card. I do not have that many photos on the SD card and I transfer them to my computer frequently, deleting them after I transfer them. I went through my Android system folders with the phone plugged into my computer, but can't find the culprit. There just isn't any one findable folder that is using a significant amount of space on the SD card. Yet according to the phone's own monitoring of itself, the SD is virtually full. What to do?