Does DBAN erase SD Cards?
Did you ever get an answer for this? I have very old mini and micro SD memory cards (16 MB to 2 GB sizes) to securely erase. :(
This feature is not supported. You can use
sudo dd if=/dev/zero of=/dev/sdX
sudo dd if=/dev/urandom of=/dev/sdX,
where /dev/sdX is your memory card.