I'm trying to figure out why my 32GB SD card is filling up. Using Astro, I've located a file called 'tmp.' It is 13 billion bytes. My non-tech brain thinks that's a lot. Apparently, so many my calculator can't calculate it. The file contains a sub-file, named 'send_cache,' which is empty, and a document, which is gibberish, and only uses 23,026 bytes. So, where are all the other bytes, and is it safe to delete? Thanks.