You can always use more USB ports. This device adds nine 3.0 ports!

The Satechi 10-Port USB 3.0 Hub adds nine additional USB 3.0 ports and one iPad-charging port to your PC or Mac. This allows you to connect and use USB devices such as digital cameras, external hard drives, flash drives, and printers, all from a single hub. Three switches control each group of three USB 3.0 ports and each group is lit with an attractive blue LED when powered on. The 10-Port USB hub’s on/off switches help users save energy for devices not in use. Instead of turning off the whole unit, it lets you turn the power off for a set of devices. Don't forget it has to be connected to a USB 3.0 port on your computer to provide data rates of up to 5.0Gbps. Shipped with an AC power supply, the Satechi 10-Port USB 3.0 Hub features electric current stability of the connected USB devices. It does not require any software, or drivers, just plug and play. Slim, strip-shape design the Hub saves  desktop space. The 10th port, located on the end of the hub, is capable of charging your iPad and features an On/Off switch. iPads are typically unable to charge from a computer's USB ports, so theSatechi 10-Port USB 3.0 Hub provides unique functionality compared to similar hubs. Portable enough to move between systems or take on the road. MSRP $69.99. As of 3/17/2014, it was on the company website for $59.99. 

http://www.satechi.net/index.php/computer-accessories/usb-hubs/satechi-10-port-usb-3-hub

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Comments

[markf]

5 Amp may sound like a lot, but the iPad charging port
needs 2.1 amps.

Leaving out the iPad charging port, the USB 3.0 limit
is 0.9A, so 9 ports actually needs 8.1 amps, meaning
that a full configuration would need 10.2 amps,
not 5.

(I've had the device for a while and it works fine,
but I would have had problems if I tried connecting
a bunch of disk drives at the same time without
providing extra power.)