I have a USB 3 to sata connector which I know worked on my Raspberry Pi 3 (USB 2). I have now cut the USB 3 cable and wanted to solder the wires directly to the Raspberry Pi. This is so that I can power the HDD and the Pi from the same power source (without using a powered USB hub).
I am getting no response when I power the Pi with the soldered HDD. I connected the 4 USB wires to a normal USB cable and plugged it in my laptop. It is not even detected.
lsusb and dmesg show no signs of the device being detected.
So my question is, are there any other requirements to get a USB 3 to be backwards compatible? I thought it would just be a case of not connecting the SuperSpeed data pairs and only using the normal USB 2 data pair.
I also have left the shielding unconnected. Since there should not be any disturbances around and the wire is short, I would assume this is fine.