Same issue here as well. Tried also with Seagate external HardDrive 6TB and with Toshiva 500GB hardrive. USB 3.0 does not detect neither of them! Thinking of returning my C9 router and buying Asus...

Just tried another external hard drive 500GB TOSHIBA STOR.E ALU 2S, without own power supply and again the same issue. USB 3.0 ports does not detect anything, while USB 2.0 port detects the hard...

I have Seagate backup plus hub 6TB (stel6000200), Model: SRD0PV1 with own power supply. My computer recognize the hard disc on USB 3.0 but my router C9/AC1900 does not. It recognize it only on USB...