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Jan 6, 2017 at 0:21 comment added Jack Creasey @FatMonk. That post makes no sense at all. If you connect an externally powered USB hub or device to a computer you can either plug in the power supply or not ..in the case of a Hub it'll still work ..and it won't under any circumstances damage the PC. It may shutdown because you draw too much current from the upstream port but there is no likelihood of damage. If you do plug in the power supply then the standard says you need to control current feedback to the upstream host. ....again, no damage.
Jan 5, 2017 at 17:20 comment added Fat Monk A comment from @kbro on this reply electronics.stackexchange.com/a/55447/135081 to another post suggests that leaving D+ and D- connected while VCC is connected is not a good idea...
Jan 5, 2017 at 17:13 history answered 555 CC BY-SA 3.0