I have a polaroid with ICS android. I was using a 16G SD card to download files and apps, and suddenly it stopped working. It told me that there is not enough space in the card even though is almost empty. Then, I lost files that were ALREADY in the card when I tried to download them to a computer. Afterwards I changed the card to a 2G SD card, and happened the same. Today, it did THE SAME to my 4G USB: NOw every time I plug in one of these anywhere it says that they are full and so far haven't been able to format them. Any tips???