I bought a cheap android tablet specifically to hold my entire MP3 collection, nothing else. It has 512GB of storage, with 500GB available. When I try to copy files to it, I can only add about 10GB and that's all. It's not the size of the files, it just won't take any more files of any size. I have 2 of these, and they both do the same thing. I have cleared the cache with no difference. Putting in an SD card the card can take all it will hold. Any suggestions to fix this? I would hate to waste 500GB by just using a big SD.