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> Relatedly, why can't I get a simple USB-C hub? I have four USB-C ports on my laptop and I need six. Back in the USB-A days, I'd just get a $30 hub and four ne
by bsder 5y ago
> Relatedly, why can't I get a simple USB-C hub? I have four USB-C ports on my laptop and I need six. Back in the USB-A days, I'd just get a $30 hub and four new full speed ports at the cost of one on the laptop.
The problem is that, I believe, a USB-C port is effectively required to provide a minimum of 5V at 3A on every port. I believe that USB 3 only requires 5V at 0.9A and USB 2.0 only requires 500mA (you nominally have to negotiate up to 500mA from 100mA--but nobody ever does that they just suck down 500mA without paying attention).
At that point, you can see how much more power USB-C is shoveling around. A 4-port hub is shoveling 60W minimum for USB-C, roughly 20W maximum for USB 3 and roughly 10W maximum for USB 2.
And, to be fair, life wasn't magically better in the USB 2 hub days. I have had loads of USB 2.0 hubs that do screwball things once they get a little overdrawn on their power. I eventually discovered that a good way to predict reliability of my USB 2 hubs was to look at the amperage of the wall wart that they shipped with it (the bigger the better).
And USB 3 isn't automatically better. I literally just had to replace a whole bunch of old, very nice, very stable, aluminum wedge USB 3 hubs because Microsoft updated something and simply plugging them in would blue screen the computer. Once I bought all new plastic chintztastic USB 3 hubs, Windoze is now happy. Microsoft can go die in a fire.