I did a test I don't know if it will be useful.
I do not HDD mounted inside HiMedia, but only on the PC connected to the storage boxes with HDD, to simulate your situation I used a USB pendirve, inserted sideways.
To see the contents of the pendrive online, I went to this path:
"\\192.168.1.xxx\share\media_rw\sda1"
I advise you to format the HDD with the PC using an adapter.
Obviously in NTFS, if each file will be more than 4GB.