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Re:CIRCLean – USB key sanitizer by aymenim on Tuesday March 14, 2017 @09:14AM (#13867209)
>plug a headset and listen to the music that is played during the conversion. When the music stops, the conversion is finished.

Bad UX but I guess it works,

I would have preferred an LED, on the Raspberry Pi GPIO ports to indicate ready, processing and finished.

Re:CIRCLean – USB key sanitizer by sleepychu on Tuesday March 14, 2017 @10:01AM (#13867511)
> If you have a Raspberry Pi with a diode, wait until the blinking stops