On Mon, Oct 02, 2017 at 09:45:29AM +0200, [email protected] wrote:
> if=debian-edu-9+edu0-USB.iso of=/dev/sdb1 bs=1024

Instead of the partion /dev/sdb1 the whole device has to be used, i.e. 
/dev/sdb (in your case); see manual.

Wolfgang

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