[MacTUG] USB 3.0 Hard Drives Can Cause Wi-Fi Interference - The Mac Observer

[Marlon A. Griffith]

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The issue is that USB 3.0 hard drives can emit radio frequencies that interfere with Wi-Fi and Bluetooth transmissions on the 2.4 GHz band, especially when placed near the antennas in your laptop. You can minimize the problem by keeping USB 3.0 hard drives away from the screen hinges on your MacBook Pro or MacBook Air, and don't set the drives behind the screen, either.

http://www.macobserver.com/tmo/article/usb-3.0-hard-drives-can-cause-wi-fi-interference
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