@mitu I tried that command and it says I have 304 MB free in dev/root. So Im guessing thats enough for a few game saves. I also Uninstalled the themes I'm not using and even a few games I'm not using.
Usually 5% of the capacity of the filesystem is reserved for the root user, so a simple user doesn't accidentally fill up the disc and crashed the system.
Depending on your card size, you might be below the 5% reserved and you may be unable to write new files, even if there is free space available.