LG HXE2S1TGL - Manual (Page 32)

10.Low Read/Write speed of USB3.0 Super Speed.
[Reason] No USB3.0 port due to the different PC or system , or no connect with
USB3.0 port. OS or USB host drive was not the latest version may no
support the fast speed .
[Solution] Using in the PC support USB3.0 interface and connect the USB3.0 port.
Update OS and USB3.0 host drive system to latest version .
11. Pop-up 'high-speed USB3.0 connection, it can provide faster performance' message.
[Reason] Connect the USB3.0 external hard disk to USB2.0 or USB1.1 port .
[Solution] Using USB3.0 external hard disk in the PC which support USB3.0 interface
or connect to the Host Card.
LG USB3.0 external hard disk can using in the USB2.0 or USB1.1 port .
Troubleshooting
32 LG External HDD Manual