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

Overview

The Buffalo TS5420DN4002 is a desktop network attached storage (NAS) server designed to centralize and protect large volumes of data for small offices, creative studios, and IT departments. It comes with two preinstalled 20 TB hard drives, providing a total of 40 TB of raw storage capacity right out of the box. Powered by a 2.04 GHz Annapurna Labs quad-core processor and 8 GB of DDR4 memory, it ensures smooth file transfers even when multiple users access large files simultaneously. This NAS supports a variety of RAID configurations and offers flexible network connectivity options, making it a versatile solution for data management and backup.

Key features

• Four hot swappable drive bays allow you to add or replace drives without powering down the system, minimizing downtime.
• Multiple RAID options (0, 1, 5, 6, 10, and JBOD) let you tailor the balance between speed, capacity, and data redundancy to fit your workflow.
• Dual 1 GbE ports plus a dedicated 10 GbE port provide flexible network configurations, including link aggregation for redundancy or separate networks for production and backup.
• Drive-level 256-bit encryption and optional two-factor authentication enhance data security and protect sensitive information.
• Snapshot backup technology captures point-in-time copies of your data, enabling quick recovery from accidental deletions or changes.
• Native cloud connectors support seamless replication to Dropbox, Amazon S3, Microsoft Azure, and OneDrive without requiring additional software.
• USB-A 3.2 Gen 1 and USB-A 2.0 ports allow connection of external storage devices, printers, or uninterruptible power supplies for expanded functionality.
• Browser-based management interface simplifies setup, RAID configuration, user permissions, and scheduled backups, making administration straightforward.

Key specs

• Storage capacity: 40 TB raw (2 x 20 TB preinstalled drives)
• Processor: Quad-core Annapurna Labs 2.04 GHz
• Memory: 8 GB DDR4
• Drive bays: 4 hot swappable
• Network ports: 1 x 10 GbE, 2 x 1 GbE
• USB ports: 2 x USB-A 3.2 Gen 1, 1 x USB-A 2.0
• RAID support: 0, 1, 5, 6, 10, JBOD
• Encryption: 256-bit drive-level

Connectivity and compatibility

This NAS server offers versatile connectivity options to fit into various network environments. The dedicated 10 GbE port supports high-speed data transfers, ideal for editing large media files or handling intensive backup tasks. The two 1 GbE ports can be configured for link aggregation to increase bandwidth or set up for network redundancy, ensuring continuous access to your data. USB ports expand the system’s capabilities by allowing external drives, printers, or UPS devices to connect directly.

• 10 Gigabit Ethernet port for high-speed network access
• Two Gigabit Ethernet ports for flexible network configurations
• USB-A 3.2 Gen 1 ports for fast external storage or peripherals
• USB-A 2.0 port for additional device support
• Cloud replication support for Dropbox, Amazon S3, Microsoft Azure, and OneDrive

Performance and reliability

The combination of a quad-core 2.04 GHz processor and 8 GB of DDR4 memory ensures the NAS handles multiple simultaneous file transfers without lag. Hot swappable bays allow maintenance or upgrades without interrupting service, which is critical for business continuity. RAID options provide flexibility to optimize for speed, capacity, or fault tolerance, while drive-level encryption and two-factor authentication protect your data from unauthorized access. Snapshot backups add an extra layer of data protection by enabling quick recovery from accidental file changes or deletions.

Ideal uses and environments

This NAS server fits well in environments where large amounts of data need to be shared, backed up, or archived reliably. It is a strong choice for architectural firms managing CAD files, creative studios handling 4K video projects, or IT departments requiring a secure and flexible file server. Its network options and cloud integration also make it suitable for distributed teams needing hybrid cloud workflows or off-site backups. The straightforward setup and management interface reduce the time and effort needed to deploy and maintain the system.