Keep file services simple, secure, and ready to grow with a TeraStation platform built for practical enterprise deployment. The 5420DN ships partially populated with 40 TB of storage across 2 x 20 TB drives, so teams can bring the system online quickly while preserving room for future expansion through its 2 open drive bays. For environments that need more than basic file sharing, 10 GbE connectivity helps reduce network constraints, while iSCSI support extends the system into storage workflows that benefit from block-level access. That makes this model a strong fit for branch offices, departmental repositories, and backup targets where performance and manageability matter, but a full-scale storage array would be excessive. TAA compliance adds procurement flexibility for organizations with sourcing requirements tied to public sector or regulated purchasing. The result is a NAS that sits above entry-level appliances: enough capacity to matter, enough network speed to stay responsive, and enough expansion headroom to avoid an early replacement cycle. It is a measured choice for teams that want controlled growth without overbuying infrastructure on day one.