I've tested a USB webcam with motion with the motion detection on. I suspect that's why the memory card has no space left. I cannot in the name find the directory where Motion stores the images saved from the camera. Any idea where could I find it?
The default target directory should be your actual working directory.
E.g. if you startet motion in your terminal from
/home/pi, the saved images should be located there.
If your want to change this directory i would recommend reading this article and configure the
Maybe in your case this directory is already set.