The CXN (V2) will read large capacity hard drives connected to their USB inputs. However, some larger capacity drives will require you to use their own power supply, as the player's USB port may not supply enough power for the drive to function.
The primary function of the CXN (V2) is as a network music player. The USB ports are intended for convenient connection of USB thumb drives. As such, we cannot guarantee compatibility with all USB HDDs.