Splitter works fine on Windows, doesn't work *at all* on Mac OS. I have a laptop that boots on Mac and Windows, the splitter works on Windows, doesn't work on Mac. I specifically asked their support if this device would work on a Mac, they said yes. Apparently they never tested the device on a Mac. It's a duplicator when used on a Mac (which you can find for $20), but it works on Windows. The only reason I don't rate it 1 star.
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