This is a bug in upstream right now with the dwc2 driver and the hub on the Odroid C2. The workaround is to plug in two USB devices, doesn't matter what kind, before booting. Your devices will be recognized. This needs to happen every time you reboot. You could use a USB flash drive and your USB HDD.
I moved from Hardkernel Ubuntu 16.04 to Armbian Stretch
mainline kernel 4.14 and I'm in same trouble too.
After boot the odroid-c2 with no attached devices or with HDD only, thumb drives and HDDs do not work any away.
But if an thumb drive is attached before boot, after, removing it or not other thumb drives and HDDs are recognized as expected.
USB HDD not recognized Odroid - Armbian 5.44
in Amlogic meson
Posted
I moved from Hardkernel Ubuntu 16.04 to Armbian Stretch
mainline kernel 4.14 and I'm in same trouble too.
After boot the odroid-c2 with no attached devices or with HDD only, thumb drives and HDDs do not work any away.
But if an thumb drive is attached before boot, after, removing it or not other thumb drives and HDDs are recognized as expected.