This is a general question about all those plug-in power-supplies/battery-rechargers that we all have so many of. The kind that have a big plug/transformer at one end that plugs into the wall, and a plug that plugs into a low-voltage electronic device at the other end.
The question is (in general): Which is better practice: 1) Plug the big plug into the wall socket, then plug the little plug into the device? 2) The other way around - plug it into the device first, then into the wall?
Or doesn't it matter? I would assume that in the vast majority of cases, it doesn't matter, but that it might matter in some. Incidentally, I have an old USB 1.0 hub from Radio Shack, the instructions to which explicitly said that one should always do it in the way of #2 above.