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<blockquote data-quote="krs" data-source="post: 1853289" data-attributes="member: 67742">Thanks Jake,Interesting article and lots of interesting comments.What I get out of that, at least for one potential problem, is that Apple seems to expect to 'see' some or maybe all of the data/power pins of USB 3 on the Macs USB-C connector even for a USB 1 or USB 2 device.Why Apple expects to &quot;see&quot; data/power pins for a USB 2 device that don't even exist in USB 2 is beyond me.But that would at least explain why a hub that presents the 9-pin USB 3 interface to that Mac works and a hub that presents the 4-pin USB 1 or USB 2 interface does not.There may also be power check issues involved as well - I had the problem moving from El Capitan to Mojave, my unpowered USB 3.0 hub stopped working in Mojave; however using a powered USB 3.0 hub worked just fine.This is strictly a software issue since both El Capitan and Mojave arerunning on the same 2012 MacMini.</blockquote>

[QUOTE="krs, post: 1853289, member: 67742"] Thanks Jake, Interesting article and lots of interesting comments. What I get out of that, at least for one potential problem, is that Apple seems to expect to 'see' some or maybe all of the data/power pins of USB 3 on the Macs USB-C connector even for a USB 1 or USB 2 device. Why Apple expects to "see" data/power pins for a USB 2 device that don't even exist in USB 2 is beyond me. But that would at least explain why a hub that presents the 9-pin USB 3 interface to that Mac works and a hub that presents the 4-pin USB 1 or USB 2 interface does not. There may also be power check issues involved as well - I had the problem moving from El Capitan to Mojave, my unpowered USB 3.0 hub stopped working in Mojave; however using a powered USB 3.0 hub worked just fine. This is strictly a software issue since both El Capitan and Mojave arerunning on the same 2012 MacMini. [/QUOTE]

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