Max SSD size via USB3

What is the max SSD size via USB 3.0 that the GL-MT1300 can take? I see the SD card only takes a max of 512GB.

I currently have it formatted as EXfat.

We have only tested a maximum of 1TB hard disk. Please also pay attention to the power supply, the MT1300 itself may not be able to support the SSD running at full speed.