The Pandora has 512mb of internal memory on the NAND.
into the terminal to check how much space you have left on the NAND. Type
du -h | more
into the terminal to find cache folders and how many megabytes they are using (then delete what is in them to free up space).
A more advanced approach will be:
du -x /|sort -n|tail -20
which will show you the top 20 in directory sizes on the NAND only.