Older USB are not full duplex and USB 3.x likely has its own funky definition of full duplex and what gadgets can do is another story.
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What part of "Simultaneous bi-directional data flows" don't you understand?
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True full duplex is simultaneous transfers in both directions at exactly the same instant. Even when the communications medium supports it, it may not in practice be used. File transfer between journaling file systems will alternately transmit and receive. WiFi is usually half-duplex as the same channel is used both ways, but a lot of Mobile phone systems use separate parts of the band for uplink and downlink.
But the point is that having a USB-C connector on a brand new ereader tells you nothing about if it's USB 2.x or USB 3.x,
or what speed it goes.
Of course some things go very fast and can use USB 3.x if the cable and both ends support it.
Also if a gadget is USB 3.x you need a compatible cable and either a blue USB 3.x USB-A socket (looks like regular kind and is backwards compatible to ordinary USB-A plugs used on USDB -A sockets using USB 1.x to 2.x.).
I was only giving some strange examples.