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I have seen recently that the US and UK have announced that all 'electronic devices' will have to be 'powered up' before allowing them on board a plane, I believe for the UK it's on all flights though I am not sure about the US.
Starting next month I am going to doing a fair amount of travelling overseas and I am concerned about some particular items I will be carrying like an external HDD, Apple TV, Apple wifi router and a mini PC (similar size to the Apple TV).
These devices don't have a battery and so can't be 'powered up', even if they are plugged in to the mains without a screen or keyboard you wouldn't really be able to tell they were actually 'on'.
I have tried to find out what the 'rules' are but they seem intentionally vague, does anyone have experience of carrying similar devices recently and know whether there might be a problem with the above.
I don't really want to end up at the airport facing losing a lot of expensive equipment and valuable data or missing the flight.