Build a storage platform that can grow with demand. The Buffalo TeraStation 5820DN 80TB NAS ships partially populated with four 20 TB NAS hard drives and four open drive bays, giving infrastructure teams a clear path to expand capacity without a forklift replacement. That matters when file growth is predictable but budgets and procurement cycles are not. With 10GbE connectivity, the 5820DN is positioned for faster access to shared files, backup targets, and application data than standard gigabit appliances. RAID support adds the redundancy expected in business storage, while iSCSI compatibility broadens deployment options for teams that need both file and block access from one system. The result is a more flexible storage tier that can serve as a central repository today and a larger production asset tomorrow. For organizations that want to avoid overbuying on day one, this model offers a practical balance: enough included capacity to start immediately, plus open bays to extend the system as workloads grow. It is a strong fit for teams standardizing on a NAS platform that can absorb more data without changing the architecture.