Bus powered USB drive

I have an early 2011 MBP and would like to put a large USB drive on it that's bus powered. My recollection from earlier times was that USB drives required two ports, one for the data and one for the power. Is that still the case, or can current USB 2.0 drives carry data and power the drive on the same port?
Thanks very much.
All the best,
Tom

Tom,
Current drives either get all their power from one usb port or if they require more current then the usb provides, they have their own power supply that plugs into the wall.
Regards,
Captfred

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