> Did you stop it via ctrl-C or how?
Hmmm... I knew there was a keyboard command, but I couldn't remember it, so I ran sudo kill (dd process #).
Since you posted, though, I tried control-C, but all it did was de-focus my Terminal window; control-option-C, on the other hand, did kill the process
control
-option-C
There is no such animal (by default).
Maybe your keyboard is on the blink too.