Booting Rpi3 MyController from USB only
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I just tried this today. It works!!!
Now no need for SD card (and no more sdcard corruption either). I had a spare 16Gb Toshiba stick hanging around and decided to give it a go. All working as before. Tested SSH, update, upgrade and everything is fine.
A possible way to go if you have pi3 and worried about SD card failure.