What Type of USB Hub?

I have an iMac 27" Processor  3.4 GHz Intel Core i7. I need more USB ports and have purchased a hub. When I plug in another accessory such as a DVD player, I get the message that it must be plugged in to a USB port on the computer. Should I be purchasing a certain kind of hub that will allow any device to be plugged in to it?

Use an USB hub with its own power supply.
(92622)

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