If the drive doesn't show up, try directly connecting it to a port on the back of your iMac. However it's safe to at least try plugging it in to your keyboard and see if it works. Bus-powered ones plugged into a USB hub (like that in your keyboard) with other devices may not have enough power to start up, or they may start up, but the connection will occasionally drop (you'll see the drive disappear from your desktop). If you have one with an external adapter, you should be fine plugging it in to whichever USB port you want. Others (typically the larger 3.5" ones) have an external power adapter. Some USB drives (typically the smaller, more portable sizes that use 2.5" hard drives) draw their power over USB (called bus-powered).
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