Quote:
Originally Posted by Matt Hepworth
No PSU. It doesn't require one. I've used it on multiple macs with only the thunderbolt cable for power—including a smaller, older MacBook Pro. I'm still unsure why there's a power option. Maybe for thunderbolt cable lengths longer than 25'.
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A power adapter is needed if other Thunderbolt devices in the chain before the Thunderbolt HD box are drawing power in excess of that the Thunderbolt port on the computer can provide.