​Why is the capacity of the new hard disk missing after ER330 formatting?

This problem is that ER330 only supports MBR hard disk formatting. If you use a hard disk larger than 2T, ER330 will automatically format it. 
It will hide the drive partition and make users mistaken that the ER330 device damages the hard disk. 

To prevent this mistake, you can partition a hard drive in Windows to create dedicated portions of the hard drive that your computer will recognize separately.
1.
https://www.businessinsider.com/how-to-partition-a-hard-drive-in-windows-10
 

2.
What is MBR & GPT (reference )
https://www.wikiversus.com/informatica/discos-duros/diferencias-mbr-vs-gpt-particion/