You can do it by hand, as I used to, or use
dmesg | tail cd /tmp sudo dcfldd if=/dev/sde1 of=pix.bin bs=1M count=100 recoverjpeg pix.bin ristretto image00*
Nothing prizewinning, but better than no picture at all:
Note that you start by copying a reasonable chunk of the partition from the Memory Stick / (micro)SD Card first, to prevent a bad situation from getting worse.
Now I can remember the easy way the next time around this block …