6 Best Alternatives to the QNAP TL-R400S 4 Bay 1U (2026)
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The QNAP TL-R400S is a practical 4-bay rackmount JBOD enclosure designed for simple storage expansion. It connects via a PCIe SATA card, making it ideal for Windows and Linux servers that need extra disk space without complex RAID management. However, you might look for qnap tl r400s 4 bay 1u alternatives if your setup requires built-in NAS features, different connectivity speeds, or pre-installed drives. Some users prefer lockable trays for security, while others need 10GbE networking or NVMe support for higher performance. Others may simply want a tower form factor instead of a rackmount unit.
This list highlights 6 options that share key specifications with the original, such as 4-bay capacity and rackmount compatibility. We selected these products because their hardware interfaces and form factors overlap with the TL-R400S. You will find choices ranging from budget-friendly expansion units to premium systems with 10GbE connectivity. Each option offers distinct advantages depending on whether you prioritize security, speed, or ease of use. The following selections cover various brands and feature sets, ensuring you find a replacement or upgrade that fits your specific server environment and storage needs.
Our top pick: QNAP 4 Bay 1U Rackmount SATA JBOD.
Comparing 4-Bay Rackmount Alternatives
QNAP TR-004U 4 Bay Rackmount NAS
The QNAP TR-004U shares the rackmount form factor and 4-bay capacity of the TL-R400S, but it functions as a NAS rather than a JBOD enclosure. This means it includes built-in RAID management and security features like lockable drive trays, which the bare enclosure lacks. It is slightly taller at 7.87 inches compared to the TL-R400S’s 7.05 inches. You should choose this if you need secure, managed storage expansion for your QNAP NAS without relying on an external PCIe card. It offers a more integrated experience for users who prioritize data protection and simplified RAID configuration over raw, unmanaged disk access.
Synology 4-Bay Compact Rackmount NAS
The Synology RS422+ is a compact 4-bay rackmount NAS that differs significantly by offering redundant networking capabilities. It is shorter than the TL-R400S, measuring 5.45 inches in height, which saves rack space. Unlike the JBOD enclosure, this unit provides flexible networking and solid throughput, making it suitable for small server setups. It is designed for users who value expandability and rack efficiency over included storage. If you need a self-contained NAS with better network resilience and a smaller footprint than the bulkier TL-R400S, this Synology model provides a more integrated solution for modern server environments.
BUFFALO TeraStation 5420RN 4-Bay 32TB
The BUFFALO TeraStation 5420RN is a premium 4-bay rackmount NAS that includes 32TB of pre-installed storage, unlike the diskless TL-R400S. It features 10GbE connectivity for faster data transfer and robust security for business use. This unit is much larger and heavier, weighing 27.2 pounds, compared to the lighter enclosure. It is a closed system ideal for businesses needing secure, ready-to-use storage with high-speed networking. Choose this if you require immediate capacity and advanced security features without managing drives separately. It sacrifices the flexibility of the JBOD design for a complete, high-performance storage appliance.
BUFFALO TeraStation 4-Bay 8TB Rackmount NAS
The BUFFALO TeraStation Essentials 8TB is a 4-bay rackmount NAS that comes with 8TB of pre-installed drives. It offers a ready-to-use, secure storage solution with included drives, contrasting with the empty bays of the TL-R400S. This model prioritizes ease of setup and data protection over advanced customization. It is suitable for users who want a simple, secure rackmount option without the need to purchase separate hard drives. If you prefer a plug-and-play experience with built-in security and straightforward management, this BUFFALO unit provides a practical alternative to the more complex PCIe-based expansion of the QNAP JBOD.
LincPlus 6-Bay 10GbE Hybrid NAS
The LincPlus LincStation N2 is a 6-bay NAS with 10GbE connectivity and M.2 NVMe support, differing greatly from the SATA-only TL-R400S. It features an Intel N100 processor and Unraid flexibility, making it ideal for users prioritizing NVMe speed. While the TL-R400S is a simple expansion unit, this LincPlus model offers strong processing power and modern storage interfaces. It is smaller in physical dimensions but provides more advanced functionality. Choose this if you need high-speed NVMe storage and 10GbE networking. It sacrifices the simplicity of the JBOD design for a more powerful, versatile NAS experience suitable for demanding workloads.
UGREEN DH4300 Plus 4-Bay NAS
The UGREEN DH4300 Plus is a 4-bay NAS with a battery backup and AI photo tools, unlike the diskless TL-R400S. It is designed for home users needing local storage with power protection, not for rackmount or virtualization needs. This unit lacks the rackmount form factor and PCIe interface of the original. It is suitable for those who prioritize ease of use and specific features like photo management over server-grade expansion. If you need a compact, feature-rich NAS for home use with battery backup, this UGREEN model is a better fit than the industrial-focused QNAP JBOD enclosure.
Quick picks
Our 7 picks
QNAP 4 Bay 1U Rackmount SATA JBOD
Best for: Server storage expansion
- Drive Bays
- 4-Bay
- Included Storage
- Diskless
- Form Factor
- Rackmount
- Hardware Interface
- SATA
- Dimensions
- 21.3 × 16.3 × 7.05 inches
View on Amazon: QNAP 4 Bay 1U Rackmount SATA JBOD Affiliate link
The QNAP TL-R400S is a 1U rackmount SATA enclosure designed for storage expansion. It holds four 3.5-inch drives and connects via a PCIe SATA card. This diskless unit supports Windows and Linux systems. It suits users needing additional local storage for servers. The compact 1U form factor fits standard racks. It provides a straightforward JBOD solution for expanding capacity.
Pros
- Holds four 3.5-inch SATA drives
- 1U rackmount form factor
- Includes PCIe SATA card
- Supports Windows and Linux
Cons
- Diskless design requires separate drives
- Requires PCIe slot for connection
- Limited to JBOD functionality
Good fit if
- You need extra local storage for a server
- You use Windows or Linux systems
- You have available PCIe slots
Skip if
- You want pre-installed drives
- You need RAID redundancy
- You lack PCIe expansion slots
Verdict: QNAP TL-R400S 4 Bay Rackmount JBOD is a practical expansion unit for users with PCIe slots who need simple storage scaling. It fits well in server racks for Windows and Linux environments.
QNAP TR-004U 4 Bay Rackmount NAS
Best for: expanding QNAP NAS storage with security
- Drive Bays
- 4 Bay
- Network Connectivity
- USB 3.0 Type-C
- Form Factor
- Rackmount
- Dimensions
- 21.3 × 16.5 × 7.87 inches
- Weight
- 4.41 pounds
View on Amazon: QNAP TR-004U 4 Bay Rackmount NAS Affiliate link
The QNAP TR-004U is a 4-bay rackmount NAS expansion unit designed to add storage space to a QNAP NAS system. It features USB 3.0 Type-C ports for faster data transfer and supports up to four SATA drives. The unit includes lockable hard drive trays and dip switches to change between hardware and software RAID control configurations. It serves as a direct-attached storage device or a hardware-based RAID storage solution.
Pros
- USB 3.0 Type-C port for faster data transfer
- Lockable hard drive trays to prevent accidental removal
- Dip switches for hardware or software RAID control
- Supports up to four SATA drives
Cons
- Requires a QNAP NAS for full RAID and health monitoring features
- No internal battery or UPS support listed
- Limited to SATA drive interfaces
Good fit if
- You need to expand storage for an existing QNAP NAS
- You want lockable drive trays for security
- You prefer hardware-based RAID control via dip switches
Skip if
- You need a standalone NAS without a host system
- You require USB 4 or Thunderbolt connectivity
- You want a built-in uninterruptible power supply
Verdict: The QNAP TR-004U 4-Bay Rackmount Expansion is a secure storage add-on for QNAP NAS users who need lockable trays and flexible RAID control options.
Synology 4-Bay Compact Rackmount NAS
Best for: compact rackmount setups needing redundant networking
- Drive Bays
- 4-Bay
- Network Connectivity
- Dual 1GbE
- Included Storage
- Diskless
- Form Factor
- Rackmount
- Dimensions
- 21 × 15.8 × 5.45 inches
View on Amazon: Synology 4-Bay Compact Rackmount NAS Affiliate link
The Synology RS422+ is a 4-bay rackmount NAS designed for space-constrained server racks. It delivers over 601/516 MB/s sequential read/write speeds. Dual 1GbE ports provide network redundancy and load balancing. The unit supports plug-and-play modules for 10GbE upgrades. It comes diskless, allowing you to select your own drives. This model suits users needing reliable performance in a compact 1U form factor.
Pros
- Over 601/516 MB/s sequential read/write throughput
- Dual 1GbE ports for failover and load balancing
- Supports plug-and-play 10GbE network upgrade modules
- Space-saving depth of 327.5 mm with handles
Cons
- Comes diskless, requiring separate drive purchases
- Base connectivity limited to 1GbE ports
- No mention of built-in UPS or battery backup
Good fit if
- You need a compact 1U rackmount solution
- You require dual 1GbE ports for redundancy
- You plan to add 10GbE connectivity later
Skip if
- You want a NAS with drives included
- You need native 10GbE without add-on modules
- You prefer a desktop tower over rackmount design
Verdict: Synology RackStation RS422+ 4-Bay NAS offers solid throughput and flexible networking for small server setups. It fits users who value expandability and rack efficiency over included storage.
BUFFALO TeraStation 5420RN 4-Bay 32TB
Best for: secure business storage with 10GbE
- Drive Bays
- 4-Bay
- Network Connectivity
- Native 10GbE port
- Included Storage
- 32TB (4x8TB)
- RAID Support
- RAID 5, RAID 6, RAID 0
- Form Factor
- Rackmount
- Dimensions
- 7.9 × 23 × 21.3 inches
View on Amazon: BUFFALO TeraStation 5420RN 4-Bay 32TB Affiliate link
This BUFFALO TeraStation 5420RN is a 4-bay rackmount NAS with 32TB of storage included. It features a native 10GbE port for fast transfers and 256-bit drive encryption for security. The system supports RAID 5 or 6 and includes snapshots for data recovery. It ships with four 8TB drives pre-installed. You should choose this if you need a closed, secure system for business data protection.
Pros
- Native 10GbE port for high-speed file transfers
- 32TB capacity with four 8TB drives included
- 256-bit drive encryption and two-factor authentication
- Snapshots for instant data backup and recovery
Cons
- Closed system limits custom software installation
- Heavier at 27.2 pounds than standard enclosures
- Larger footprint at 23 inches wide
Good fit if
- You need a secure, closed system for business data
- You require 10GbE connectivity for fast transfers
- You want drives included with the unit
Skip if
- You prefer open-source NAS operating systems
- You need a compact desktop form factor
- You want to use smaller drives individually
Verdict: BUFFALO TeraStation 5420RN 32TB Rackmount NAS offers robust security and speed for businesses needing a secure, closed system with 10GbE connectivity and pre-installed drives.
BUFFALO TeraStation 4-Bay 8TB Rackmount NAS
Best for: Ready-to-use secure rackmount storage
- Drive Bays
- 4-Bay
- Network Connectivity
- 2.5GbE
- Included Storage
- 8TB (4x2TB)
- RAID Support
- RAID 0, 5, 6
- Form Factor
- Rackmount
View on Amazon: BUFFALO TeraStation 4-Bay 8TB Rackmount NAS Affiliate link
This BUFFALO TeraStation Essentials is a 4-bay rackmount NAS with 8TB of pre-installed storage. It features a 2.5GbE port for fast file transfers and includes hard drives for immediate use. The system supports RAID 5, 6, or 0 configurations. You get 256-bit drive encryption and hybrid cloud sync options. It is a solid choice for users needing a simple, secure, and ready-to-use storage solution.
Pros
- Includes 8TB of pre-tested hard drives
- Native 2.5GbE port for fast transfers
- 256-bit drive encryption for data protection
- Supports RAID 5, 6, and 0 modes
Cons
- Only includes a single 2.5GbE port
- Closed system limits advanced customization
- Smaller usable capacity in default RAID 5
Good fit if
- You need a rackmount NAS with drives included
- You want simple setup with pre-configured RAID
- You require 256-bit drive encryption
Skip if
- You need multiple 10GbE ports
- You prefer open-source software flexibility
- You require expandable storage beyond 8TB
Verdict: BUFFALO TeraStation Essentials 8TB 4-Bay Rackmount NAS is a practical option for users who want a ready-to-use, secure storage solution with included drives. It fits those prioritizing ease of setup and data protection over advanced customization.
LincPlus 6-Bay 10GbE Hybrid NAS
Best for: NVMe-heavy storage and 10GbE speed
- Drive Bays
- 6-Bay
- Network Connectivity
- 1x 10GbE
- Processor
- Intel N100
- RAM Capacity
- 16GB LPDDR5
- M.2 NVMe Slots
- 4 slots
- Included Storage
- Diskless
View on Amazon: LincPlus 6-Bay 10GbE Hybrid NAS Affiliate link
The LincStation N2 is a 6-bay NAS with four M.2 NVMe slots and two SATA bays. It uses an Intel N100 processor and 16GB LPDDR5 RAM. A 10GbE port supports fast transfers. It includes an Unraid OS license for flexible drive mixing. This diskless unit suits users needing high-speed NVMe storage and strong processing power for media or virtualization.
Pros
- Four M.2 NVMe slots for high-speed storage
- 10GbE network connectivity for fast transfers
- Intel N100 processor with 16GB LPDDR5 RAM
- Includes Unraid OS starter license
Cons
- Diskless with no included drives
- Only two SATA bays for HDDs
- Uses LPDDR5 soldered RAM
Good fit if
- You need multiple NVMe drives for speed
- You want 10GbE network connectivity
- You prefer Unraid OS flexibility
Skip if
- You need pre-installed drives
- You require more than two SATA bays
- You want standard 2.5GbE connectivity
Verdict: LincPlus LincStation N2 6-Bay NAS is ideal for users prioritizing NVMe speed and Unraid flexibility. It fits those needing 10GbE and strong processing power.
UGREEN DH4300 Plus 4-Bay NAS
Best for: home users needing power backup and AI photo tools
- Drive Bays
- 4-Bay
View on Amazon: UGREEN DH4300 Plus 4-Bay NAS Affiliate link
The UGREEN DH4300 Plus is a 4-bay NAS designed for home users seeking private cloud storage. It supports Docker containers but does not support virtual machines. The bundle includes a 12000mAh uninterruptible battery supply to maintain power during outages. You can access data remotely across Windows, macOS, Android, and iOS. The system features AI album recognition and semantic search for photo management. It connects via NFC for quick setup.
Pros
- Includes 12000mAh uninterruptible battery power supply
- Supports Docker container applications
- Features AI photo recognition and semantic search
- Enables remote access from multiple operating systems
- Allows quick setup via NFC connection
Cons
- Does not support virtual machines
- Designed for home use rather than enterprise environments
- Lacks rackmount form factor unlike the QNAP TL-R400S
Good fit if
- You need backup power for your storage devices
- You want to manage photos with AI classification
- You are setting up a home media library
Skip if
- You require virtual machine support
- You need a 1U rackmount enclosure
- You are building a business server
Verdict: UGREEN DH4300 Plus 4-Bay NAS with Battery suits home users who need local storage with power backup and photo management. It is not for those needing virtualization or rackmount hardware.
Specifications side by side
| Spec | QNAP 4 Bay 1U Rackmount SATA JBOD | QNAP TR-004U 4 Bay Rackmount NAS | Synology 4-Bay Compact Rackmount NAS | BUFFALO TeraStation 5420RN 4-Bay 32TB | BUFFALO TeraStation 4-Bay 8TB Rackmount NAS | LincPlus 6-Bay 10GbE Hybrid NAS | UGREEN DH4300 Plus 4-Bay NAS |
|---|---|---|---|---|---|---|---|
| Drive Bays | 4-Bay | 4 Bay | 4-Bay | 4-Bay | 4-Bay | 6-Bay | 4-Bay |
| Network Connectivity | not stated | USB 3.0 Type-C | Dual 1GbE | Native 10GbE port | 2.5GbE | 1x 10GbE | not stated |
| Processor | not stated | not stated | not stated | not stated | not stated | Intel N100 | not stated |
| RAM Capacity | not stated | not stated | not stated | not stated | not stated | 16GB LPDDR5 | not stated |
| M.2 NVMe Slots | not stated | not stated | not stated | not stated | not stated | 4 slots | not stated |
| Included Storage | Diskless | not stated | Diskless | 32TB (4x8TB) | 8TB (4x2TB) | Diskless | not stated |
| RAID Support | not stated | not stated | not stated | RAID 5, RAID 6, RAID 0 | RAID 0, 5, 6 | not stated | not stated |
| Form Factor | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | not stated | not stated |
| Hardware Interface | SATA | not stated | not stated | not stated | not stated | SATA, M.2 NVMe | not stated |
| Number of Bays | 4-Bay | 4-Bay | 4-Bay | 4-Bay | 4-Bay | 6-Bay | 4-Bay |
| Dimensions | 21.3 × 16.3 × 7.05 inches | 21.3 × 16.5 × 7.87 inches | 21 × 15.8 × 5.45 inches | 7.9 × 23 × 21.3 inches | not stated | 5.91 × 8.27 × 1.38 inches | not stated |
| Weight | not stated | 4.41 pounds | not stated | 27.2 pounds | not stated | 1.76 pounds | not stated |
| Size | 4 Bay | 4 Bay | RS422+ | 32TB (4x8TB) | 8TB (4x2TB) | 5.9 x 8.2 x 1.5 inches | not stated |
| Color | black | Black | Black | Black | Black | Neutral | black |
| Model | TL-R400S | TR-004U | RS422+ | TS5420RN3204 | TS3420R0804S | N2 | B0FPD93QC6 |
Frequently asked questions
Is the QNAP TL-R400S a NAS or a JBOD?
The QNAP TL-R400S is a JBOD (Just a Bunch of Disks) enclosure, not a full NAS. It lacks built-in RAID management and operating system features. Instead, it connects via a PCIe SATA card to expand storage for existing Windows or Linux servers. You manage the drives directly through your host system.
What is the best alternative for server storage expansion?
The QNAP TL-R400S itself is rated as the best overall for server storage expansion. It is a practical 4-bay rackmount unit designed for simple scaling. It fits well in server racks for Windows and Linux environments where you need extra disk space without complex setup.
Which option offers lockable drive trays for security?
The QNAP TR-004U is the best budget choice for users needing security. It functions as a rackmount NAS with lockable drive trays. This feature protects your data physically while allowing flexible RAID control options. It is a secure storage add-on for QNAP NAS users.
Does Synology offer a compact 4-bay rackmount NAS?
Yes, the Synology RackStation RS422+ is a compact 4-bay rackmount NAS. It offers solid throughput and flexible networking for small server setups. This unit fits users who value expandability and rack efficiency over included storage. It is a strong alternative for network-attached storage needs.
Which NAS includes pre-installed drives and 10GbE?
The BUFFALO TeraStation 5420RN is the best premium option with pre-installed 32TB of storage. It includes 10GbE connectivity for robust speed. This closed system is designed for businesses needing secure, ready-to-use storage. It prioritizes data protection and ease of setup over advanced customization.
Is there a NAS with NVMe support for speed?
The LincPlus LincStation N2 is the best choice for NVMe-heavy storage. It is a 6-bay hybrid NAS featuring an Intel N100 processor. It supports M.2 NVMe drives and 10GbE network connectivity. This unit suits users prioritizing high speed and Unraid flexibility over traditional rackmount form factors.
Which NAS is best for home users needing power backup?
The UGREEN DH4300 Plus is ideal for home users needing power backup. It is a 4-bay NAS with a built-in battery. This unit supports local storage and AI photo management tools. It is not designed for virtualization or rackmount hardware, focusing instead on ease of use.