I don't know but i plug in maximum 2 TB HDD, it was fine. Try to plug in and try it, maybe will work but i am not sure.
I already have 2 hard drives with power supply, I'm afraid the x9s won't see the full 14 tb capacity of the hard drive
There is no limit in anyway at 14 TB. Above 16TB there is a limit for USB External HDD's doing sector translation (to be compatible with older OS versions). For SATA attached HDD's there is no foreseeable limit except running out of task memory in one way or the other.
I have new information, I don't know if people know who bought the Zidoo Z10 Pro. I tried the 14TB Toshiba HDD, the new one tried the 16TB Toshiba Server (Enterprise Capacity MG08). Manual have Zidoo wrote that it has a capacity limit of 14TB. I have no problem, the new one shows a capacity of 14.9TB! If someone has more information or could try a bigger disk, please let me know.