The range of personal computers Apple iMac represents one “all–one” approach to it. IMacs combine the traditional computer tower and monitor into a single unit to eliminate clutter in the office.Each iMac model developed by Apple has a number of USB ports, usually between two and four. When more than four USB devices must be connected to the iMac computer, additional USB ports can be added to the iMac with a USB hub.
Things you need
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1. Purchase a USB hub. There are two types of 3.0 USB hubs: active and passive. Passive hubs are powered by the USB port of the iMac. Active hubs have a separate electrical outlet that connects to a power outlet.Active hubs are preferred to passive hubs and are required for devices that takes power, such as self-powered external hard drives.
2. Plug one end of the USB cable to the USB hub.
3. Connect the other end of the USB cable to a USB port on the computer. The iMac detects and automatically configures the new USB hub.
4. Connect USB devices to the USB hub.