External USB Hub limit for Satellite Pro C650

Is there a limit to how many external usb ports you can connect through the Satellite Pro C650?
Wtih the four port hub I have, the ports seem to work individually and all devices work normally when plugged directly into the lap top, but when all devices are plugged into the hub and lap top combined, there are errors coming up.
Thanks,
Karyn

Well, I think this should not be a problem if the single USB hubs provide own power.
The point is that the single USB port provides common 500mA and if more devices would share the power from one USB port then it could be possible that the available 500mA would not be enough for all USB devices.

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