Even if the destination device were to write something to said discs, the optical media are cheap enough that it makes sense to destroy them (or archive them in

Even if the destination device were to write something to said discs, the optical media are cheap enough that it makes sense to destroy them (or archive them in case they become useful for forensic purposes) rather than reusing them. Plus, compared to a USB form factor, one imagines it’s harder to sneak in circuitry that could retransmit data by unexpected means.