Buffalo TeraStation 5420DN 40TB 4-Bay Desktop NAS Server (2 x 20TB)

The Buffalo TS5420DN4002 is a desktop network attached storage server with four drive bays that gives small offices, creative studios, and IT departments a straightforward way to centralize and protect up to 40 TB of data. It arrives with two preinstalled 20 TB hard drives, so you can begin backing up workstations or collecting media libraries immediately.

At its core is a 2.04 GHz Annapurna Labs processor working alongside 8 GB of DDR4 memory. This combination keeps file transfers smooth even when many users are reading and writing large files at the same time. Whether you are editing 4K footage across a 10 Gigabit link or running routine backups over standard Gigabit Ethernet, the system maintains consistent throughput.

Four hot swappable bays allow drives to be added or replaced without shutting the unit down. You can select from RAID 0, 1, 5, 6, or 10, or opt for JBOD when capacity matters more than redundancy. This flexibility lets you balance speed, capacity, and fault tolerance to match each workflow.

Dual 1 GbE ports sit alongside a dedicated 10 GbE port, giving you the option to aggregate links for redundancy or assign different networks for production and backup. Two USB-A 3.2 Gen 1 ports and an additional USB-A 2.0 port support external drives, printers, or an uninterruptible power supply.

Security features include drive-level encryption with 256-bit keys and two-factor authentication for the management interface. Snapshot backup captures point-in-time copies of your data, making recovery from accidental deletions quick and straightforward. If you need an off-site copy, built-in connectors let you replicate to Dropbox, Amazon S3, Microsoft Azure, or OneDrive without extra software.

From an architectural firm sharing CAD files to a production house archiving video projects, the TeraStation 5420DN slides easily into existing network environments. It can act as a primary file server, a secondary backup target, or a hybrid cloud gateway for distributed teams.

Setup is handled through Buffalo’s browser-based interface which guides you through RAID creation, user permissions, and scheduled backups. Because the drives are already installed, initial deployment often takes only a few minutes.

• 40 TB of raw capacity, delivered through two preinstalled 20 TB drives
• Four bays that are hot swappable, letting you add or replace drives while the system is running
• Quad core 2.04 GHz Annapurna Labs processor paired with 8 GB of DDR4 memory
• One 10 GbE port and two 1 GbE ports for flexible network connectivity
• RAID 0, 1, 5, 6, 10, or JBOD options that balance speed, capacity, and redundancy
• Drive-level 256-bit encryption and optional two-factor authentication
• Snapshot backup that enables quick point-in-time recovery
• USB-A 3.2 Gen 1 and USB-A 2.0 ports for external storage, printers, or UPS connections
• Native cloud connectors for Dropbox, Amazon S3, Microsoft Azure, and OneDrive
• Browser-based management interface that simplifies setup and ongoing maintenance