[NikolaNovak]

Yeah, that was actually quite helpful (when properly implemented). Especially in era of laptops that had a mixture, you knew to plug in the portable drive into blue not the black USB port (and put your phone to charge into yellow one:).

[extraduder_ire]

Yellow (always supplies power) was non standard, as was green. Would have been nice if that was included in an addendum to the USB spec though.