Is your computer running low on USB 3.0 ports? If your motherboard has a USB 3.0 20-pin header, you can use the Atech Flash Technology Dual USB 3.0 Type-B Male to USB 3.0 20-Pin Male Cable to hook up two more USB 3.0 Type-B devices.
Each USB 3.0 Type-B connection is manufactured to the official USB 3.0 specifications, giving you data transfer rates of up to 5 Gb/s. This cable also supports bus powered devices, which means both data and power travel over a single cable, saving you from dealing with another external power supply.