Thank you very much for the power tip. I have one of those old Kill-A-Watt power meters. The RPi4 draws 5 watts normally. 7 watts with one USB disk. The 2nd USB would likely take it to 9 watts. Thank you also for the advice about hot plugging. I didn't even realize that could be an issue. Corrected ...

Totally love the Raspberry Pi 4. Cannot believe how much power in 5 watts in a little case. Can't believe I am running Blender and GIMP and Chromium as fast as it's running. Also measured 5 Gigaflops single precision and 2 Gigaflops double precision. Truly amazing. First played with RPi 1B+ in March...

Thank you very much for this pointer. Just what I was looking for.

Thank you for this demo example. Really excellent!