Made by Micron 512MiB 1.8V 16bit.
It is highly recommended to run Ångström or other OS from SD card, by doing that you also avoid wear and tear 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.