Mine has always been on Instant On, the only thing I hate is that in the middle of the night, I will hear the external drive(I have a seagate 4TB expansion drive) turn on for a few minutes, and I can hear the humming and its like its looking for something, then about 10 minutes later it will turn off..weird thing is that I have my external drive set to turn off when the xbox one turns off yet it will turn itself on at around 2:30AM its very annoying, any way around this? I think its looking for updates thats why its turning on I guess I can uncheck install updates but maybe I should just leave it the way it is
You're correct. It turns on to install updates for the games that are in it.
You could turn off the install updates option, but then you lose the biggest benefit from having Instant On.