Are both the USB ports the same? (MBP 15" 2.2 Ghz)

I am trying to use an external HDD (not powered) on the left USB port but the drive fails to load. A memory stick and mouse connect to this port work fine. The port on the right works just fine.
Is there a difference between the left and right USB ports?

Although both ports should be identical this is a problem others have reported (including myself.) Devices that require all the power the USB port is capable of providing may only work on the right side port. This may be especially the case with external drives. There is no fix for this except to only use the right side port for an external drive.

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