Quote: Originally Posted by whs
I have a cheap $5 unpowered hub from where I run 1 USB stick, the keyboard and 2 mices (yes I use one left and one right). Never had a problem.
Now that's interesting - stereo mice.
Most USB ports will deliver 500mA (@5V). A passive hub just divides this current load. If the sum of the current loads exceed this then a passive hub will cause problems. Some single devices will take the full load current.
I'm not sure if current limiting is common on motherboard or laptop USB ports. If not you could do serious damage.