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MacBook Pro recommended USB port(s)
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The use of USB Audio Devices on the Left-Hand USB Port Is Not Recommended.  This applies to ALL black and white MacBook Pro Models (Core Duo and Core 2 Duo).  This DOES NOT apply to the Aluminum Uni-body MacBook Pro's.

•    The 15" MacBook Pro models have 1 USB port on the left side, and one USB port on the right side.
•    The 17" MacBook Pro models have 2 USB ports on the left side, and one USB port on the right side.

Due to the current USB configuration of the 15" MacBook Pro under OS X, use of USB audio devices is supported on the right-hand USB port only.  Use of such devices on the left-hand USB port(s) is not advised because it may cause audio interrupts and/or dropped samples.  However, the use of an iLok on the left-hand port has been qualified and is fully supported.

Due to the current USB configuration of the 17" MacBook Pro under OS X, use of USB audio devices is only supported on the right-hand USB port, and the left-hand USB port farthest from the screen.  Use of such devices on the left-hand USB port closest to the screen is not advised because it may cause audio interrupts and/or dropped samples.  However, the use of an iLok on the left-hand port has been qualified and is fully supported.

These USB port recommendations are specific to USB Audio devices only (such as the Audiophile USB).  USB Keyboard and Control Surface products do not have a recommended USB port at this time.