I need a USB hub. I have run out of ports.
Actually, the power provided in a powered USB hub is to boost signal transmission. Unlike SCSI where the Terminator Bus can have power supplied to it by the devices connected to it, the USB bus cannot do this (at least not yet..) The power that your scanner requires is just to power the device itself, none of it goes to the USB port. If the scanner had a built in USB hub (like most new high end monitors) then the USB hub built into that device will receive power from the AC that powers that device.I realize that USB-hubs without a A/C power supply will cause problems if you plug in many different power-sucking devices in at the same time via the hub and some may start to fail -- however, if I plug a scanner into a non-A/C powered hub; and the scanner has its own A/C power via wall outlet, then it doesn't take power via USB, does it? I'm assuming just devices that do NOT need a A/C power via wall outlet such power via USB port(s)/hubs.