Building a DIY NAS in 2026 means choosing the right rackmount chassis that balances performance, ease of use, and expandability. The TERRAMASTER D4-320U stands out for its compact 1U design and high-speed USB 3.2 Gen2 connectivity, making it ideal for quick setups and small-scale environments. On the other hand, the Synology RS422+ offers a robust, high-throughput NAS experience with dual Ethernet ports and upgrade options, suited for more demanding or enterprise-oriented users. The main tradeoffs come down to the D4-320U’s lack of RAID support versus the RS422+’s additional complexity and cost. Your choice depends on whether you prioritize simplicity and fast data access or higher network performance and scalability.
Key Takeaways
- The TERRAMASTER D4-320U excels in compactness and high-speed USB connectivity but lacks RAID options.
- The Synology RS422+ provides superior network throughput and upgrade paths at a higher price point.
- Both options support four-drive configurations, but their target use cases differ significantly.
- Ease of setup favors the TERRAMASTER, while the Synology caters to users needing enterprise features.
- Cost and complexity are the main tradeoffs when choosing between these two solutions.
| TERRAMASTER D4-320U Hard Drive Enclosure 4-Bay 1U Rack Mount USB 3.2 Gen2 |  | Best Overall for Simplicity and Speed | Hardware Interface: USB 3.2 Gen 2 | Hardware Platform: Windows, Mac, Linux | Hard Disk Form Factor: 3.5 inches | VIEW ON AMAZON | See Our Full Breakdown |
| Synology 4-Bay Rackmount NAS RackStation RS422+ (Diskless), Black |  | Best for High-Speed, Enterprise-Ready NAS | Form Factor: Rackmount | Number of Bays: 4 | Diskless: Yes | VIEW ON AMAZON | See Our Full Breakdown |
| rackmount storage chassis for diy na | Hardware Interface | Hardware Platform | Hard Disk Form Factor | Supported Devices Quantity |
|---|---|---|---|---|
| TERRAMASTER D4-320U Hard Drive | USB 3.2 Gen 2 | Windows, Mac, Linux | 3.5 inches | 4 |
| Synology 4-Bay Rackmount NAS R | — | — | — | — |
More Details on Our Top Picks
TERRAMASTER D4-320U Hard Drive Enclosure 4-Bay 1U Rack Mount USB 3.2 Gen2
The TERRAMASTER D4-320U stands out for its straightforward, space-efficient 1U rackmount design and ultra-fast USB 3.2 Gen2 data transfer speeds, supporting up to 10 Gbps. This makes it perfect for those who want hassle-free setup and rapid data access, especially in small business or home lab environments. Compared with the Synology RS422+, which emphasizes network throughput, this enclosure focuses on direct, high-speed connections to a host system. Its hot-swappable bays make maintenance simple, although its lack of RAID support means data redundancy must be managed separately. This pick is best for users who prioritize speed and simplicity over advanced storage configurations.
Pros:- Compact 1U rackmount design
- High-speed data transfer up to 10 Gbps
- Hot-swappable drive bays for easy maintenance
- Supports large storage capacity up to 120TB
Cons:- No RAID support, only individual disks
- Requires compatible NAS or PC for full NAS functionality
Best for: Small businesses, data center expansions, enthusiasts needing quick access
Not ideal for: Users seeking RAID functionality or integrated network features
- Hardware Interface:USB 3.2 Gen 2
- Hardware Platform:Windows, Mac, Linux
- Hard Disk Form Factor:3.5 inches
- Supported Devices Quantity:4
- Data Transfer Rate:10 Gbps
- Connectivity Technology:USB
Our verdict“A versatile, easy-to-use enclosure ideal for high-speed direct connections in small-scale setups.”
Synology 4-Bay Rackmount NAS RackStation RS422+ (Diskless), Black
The Synology RS422+ is designed for users who need a high-performance, scalable NAS solution. Its high sequential read/write speeds of 601/516 MB/s make it suitable for intensive data transfer tasks, and the dual 1GbE ports provide network failover and load balancing. Unlike the TERRAMASTER, it comes diskless, requiring users to select compatible drives, which adds flexibility but also complexity. Its upgrade options for 10GbE connectivity cater to future-proofing needs, yet the setup process can be daunting for newcomers. This model makes the most sense for those with demanding workloads or enterprise environments that can leverage its advanced features.
Pros:- Exceptional sequential read/write speeds
- Dual 1GbE ports for network redundancy
- Upgradeable for 10GbE network support
- Space-saving rackmount design
Cons:- Requires additional disks, no included storage
- More complex setup and management
Best for: Power users, small businesses, enterprise environments
Not ideal for: Beginners or users looking for plug-and-play simplicity
- Form Factor:Rackmount
- Number of Bays:4
- Diskless:Yes
- Sequential Read/Write:601/516 MB/s
- Network Ports:2 x 1GbE
- Upgrade Modules:10GbE RJ-45 support
Our verdict“A high-end NAS chassis suited for demanding workloads and users who need scalability and speed.”
How We Picked
Our selection considers key factors such as connectivity options, data transfer speeds, expandability, ease of use, and compatibility. We prioritized products designed explicitly as rackmount chassis suitable for DIY NAS builds, with a focus on balancing performance and affordability. The products also had to support multiple drive configurations, with attention to user experience for both beginners and more advanced users. We compared specs, user reviews, and the reputation of each brand to ensure these picks serve different needs within the DIY NAS community.
Factors to Consider When Choosing Rackmount Storage Chassis For Diy Nas
Choosing the right rackmount chassis for your DIY NAS involves balancing performance, ease of use, and future upgrade potential. Your ideal choice depends on whether you prioritize straightforward setup and high-speed direct connections or need enterprise features like network redundancy and scalability. Understanding your specific needs helps narrow the options and ensures your investment supports your data storage goals.Performance Needs
If speed is your priority, especially for tasks like media streaming or large data transfers, the Synology RS422+ offers impressive throughput and upgrade options. For simpler, direct-attached storage, the TERRAMASTER D4-320U provides high-speed USB connectivity without the complexity of network setup.
Ease of Use
The TERRAMASTER shines for plug-and-play simplicity with hot-swappable bays and straightforward setup. Conversely, the Synology requires more configuration but delivers advanced features like network failover and scalability, suited for more experienced users.
Expandability & Future Proofing
If you plan to expand your network or storage in the future, the Synology’s upgrade paths for 10GbE and redundancy make it a better long-term investment. The TERRAMASTER’s primary advantage is simplicity and speed, which suits smaller or temporary setups.
Frequently Asked Questions
Can I use these chassis for RAID configurations?
The TERRAMASTER D4-320U does not support RAID; it simply offers four individual drive bays. You would need additional hardware or software to implement redundancy. The Synology RS422+ supports RAID configurations via its NAS operating system, making it suitable for users who want data redundancy and protection without extra hardware.
Is the setup process complex for beginners?
The TERRAMASTER D4-320U offers straightforward installation with minimal configuration, ideal for users new to rackmount NAS setups. The Synology RS422+ requires more initial setup, including drive installation and network configuration, which might be challenging for those unfamiliar with NAS management but pays off with advanced features.
Which product is better for small home labs?
For small home labs or casual users, the TERRAMASTER D4-320U provides an excellent balance of speed and simplicity without the need for extensive network configuration. The Synology RS422+ is better suited for users who need more robust networking features and plan to scale or integrate into a larger network.
What are the main tradeoffs between these options?
The main tradeoff is that the TERRAMASTER emphasizes ease of use and direct USB connectivity at the expense of RAID and network features. The Synology offers high performance and scalability but involves more complex setup and higher costs. Your choice hinges on whether you prefer simplicity or advanced, enterprise-grade features.
Are these chassis compatible with all drives?
Both products support standard 3.5-inch SATA drives. The TERRAMASTER D4-320U explicitly supports large capacities up to 120TB, making it versatile for various drives. The Synology RS422+ requires compatible drives, and it’s important to check compatibility lists before purchasing to ensure optimal performance and reliability.
Conclusion
For users seeking a straightforward, high-speed solution, the TERRAMASTER D4-320U is an excellent choice, especially for small setups or those just starting with DIY NAS builds. If you need a more scalable, enterprise-ready system with network redundancy and faster throughput, the Synology RS422+ is the better fit. Budget-conscious users or beginners should lean toward the TERRAMASTER, while experienced users or small businesses will benefit from the Synology’s advanced capabilities.
