QNAP 4-Bay Short-Depth Rackmount NAS Alternatives: 6 Similar Picks Compared

How these alternatives compare

QNAP TR-004U 4 Bay Rackmount NAS

The QNAP TR-004U is a rackmount expansion unit, not a standalone NAS. It lacks its own processor and operating system, relying on an existing QNAP server for hardware RAID control. This makes it ideal for adding four extra bays to a current setup rather than replacing one. Unlike the TS-435XeU, it offers no independent networking or NVMe slots. You get a secure, compact add-on for growing storage needs without managing a second network device. Choose this if you already own a QNAP NAS and need more drive capacity quickly. It fits standard rack spaces but requires a host system to function.

QNAP 4 Bay 1U Rackmount SATA JBOD

The QNAP TL-R400S is a JBOD expansion chassis, not a network-attached storage device. It connects via PCIe slots in compatible servers, providing simple SATA scaling without its own CPU or OS. This unit strips away networking features entirely, offering no Ethernet ports or independent management. It differs from the TS-435XeU by focusing purely on raw disk expansion within a server rack. You lose dual 10GbE and NVMe acceleration but gain straightforward SATA connectivity for legacy systems. Pick this if your server needs more local storage via PCIe rather than network access. It is a specialized tool for scaling internal drive counts in compatible rack servers.

Synology 4-Bay Compact Rackmount NAS

The Synology RS422+ offers a shallow 1U rackmount form factor with dual 1GbE ports. It lacks the TS-435XeU’s dual 10GbE uplinks and dual M.2 NVMe slots. You get a compact, quiet unit suitable for tight rack spaces but must purchase drives and optional 10GbE modules separately. This model gives up high-speed native networking and cache acceleration for a smaller footprint. It suits users who prioritize physical size over integrated performance features. The Synology ecosystem provides different management tools, but you sacrifice the Marvell processor’s power and built-in NVMe support found in the QNAP. Choose this for shallow racks where speed is less critical than depth.

BUFFALO TeraStation 5420RN 4-Bay 32TB

The BUFFALO TS5420RN comes with 32TB of included drives, offering immediate capacity without buying disks separately. It features 10GbE networking and business-focused security like encryption and snapshots. However, it is significantly larger and heavier than the short-depth QNAP, measuring 21.3 inches in length. You trade the compact, shallow design for pre-installed storage and a closed system. The BUFFALO lacks the TS-435XeU’s dual M.2 NVMe slots and DDR4 RAM expandability. It suits teams needing heavy-duty, secure storage with included media. Pick this if you prefer a turnkey solution with high security features over a customizable, space-saving rackmount option.

BUFFALO TeraStation 4-Bay 8TB Rackmount NAS

The BUFFALO TS3420R0804S includes 8TB of drives and focuses on simple cloud sync and backup. It lacks the TS-435XeU’s dual 10GbE ports, NVMe slots, and expandable RAM. This model offers a closed system with less customization but includes essential drives for immediate use. You give up high-speed networking and cache acceleration for a straightforward, secure storage solution. It suits users who value ease of setup and cloud integration over advanced performance features. The unit is a standard rackmount size, differing from the short-depth QNAP. Choose this if you want a simple, secure rackmount NAS with included storage rather than a high-performance, customizable server.

QNAP 4-Bay 10GbE Rackmount NAS

The QNAP TS-432PXU-RP-2G provides redundant power supplies, a feature absent in the TS-435XeU. It offers strong 10GbE networking for uptime and speed but lacks the dual M.2 NVMe slots for cache or storage pools. You gain power redundancy and robust connection speeds but sacrifice SSD acceleration capabilities. This model suits users who prioritize continuous operation and network reliability over flash storage performance. It is a standard rackmount unit, differing from the short-depth design of the TS-435XeU. Pick this if redundant power is critical for your environment and you do not require NVMe acceleration. It offers similar QNAP management but with different hardware priorities.

Quick picks

Our 7 picks

1 Best overall

QNAP 4-Bay Short-Depth Rackmount NAS

Best for: Users needing dual 10GbE connectivity

Drive Bays

4 Bay

Network Connectivity

Dual 10GbE, Dual 2.5GbE

Processor

Marvell OCTEON TX2 CN9130 / CN9131

RAM Capacity

4GB DDR4

M.2 NVMe Slots

2 slots

Form Factor

Rackmount

View on Amazon: QNAP 4-Bay Short-Depth Rackmount NAS Affiliate link

This 4-bay rackmount NAS features a quad-core 2.2 GHz processor and 4GB of DDR4 RAM. It includes dual 2.5GbE and dual 10GbE ports for high-speed networking. Two M.2 NVMe slots allow for cache acceleration or SSD storage pools. It supports backup for Google Workspace and Microsoft 365. This unit suits users needing dense storage in a 1U form factor with robust connectivity options.

Pros

• Quad-core 2.2 GHz ARMv8 processor
• Dual 10GbE and dual 2.5GbE ports
• Two M.2 NVMe slots for caching
• 4GB DDR4 RAM expandable to 32GB

Cons

• Limited to 4GB base RAM
• No mention of USB Type-C connectivity
• Short depth design may limit cable management

Good fit if

• You need dual 10GbE ports
• You require a 1U rackmount form factor
• You want NVMe caching capabilities

Skip if

• You need more than four drive bays
• You require USB Type-C connectivity
• You prefer a tower form factor

Verdict: QNAP TS-435XeU 4-Bay Rackmount NAS offers robust networking with dual 10GbE ports and NVMe support, making it ideal for users needing high-speed data transfer in a compact 1U rackmount chassis.

2 Best budget

QNAP TR-004U 4 Bay Rackmount NAS

Best for: expanding existing QNAP NAS systems

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

This is a 4-bay rackmount NAS expansion unit designed to add storage space to your existing QNAP system. It features a USB 3.0 Type-C port for faster data transfer and supports up to four SATA drives. The lockable hard drive trays help prevent accidental removal, while dip switches allow you to configure RAID groups via hardware or software control. It serves as reliable direct-attached storage.

Pros

• USB 3.0 Type-C port for faster data transfer
• Lockable hard drive trays for security
• Dip switches for hardware or software RAID control
• Supports up to four SATA drives

Cons

• Requires a host QNAP NAS for full software management
• No built-in display or network ports for standalone use
• Limited to expansion rather than standalone operation

Good fit if

• You need extra storage for an existing QNAP system
• You want lockable drive bays for security
• You prefer hardware-based RAID configuration options

Skip if

• You need a standalone NAS without a host system
• You require built-in network connectivity for direct access
• You want a compact desktop form factor instead

Verdict: QNAP TR-004U 4-Bay Rackmount Expansion is a secure storage add-on for users who already have a QNAP NAS and need more drive bays with hardware RAID control.

3 Best sata

QNAP 4 Bay 1U Rackmount SATA JBOD

Best for: expanding SATA storage in compatible servers

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

This is a 1U rackmount SATA JBOD enclosure designed for storage expansion. It holds four 3.5-inch drives via SATA 6Gb/s interfaces. The unit measures 16.3 by 21.3 inches and stands 7.05 inches tall. It includes a QXP-400eS-A1164 PCIe card and an SFF-8088 cable. You can use it to expand storage for QNAP NAS systems, Windows PCs, or Linux servers. It is diskless.

Pros

• Four 3.5-inch SATA bays for drive expansion
• SATA 6Gb/s interface for high performance
• Includes QXP-400eS-A1164 PCIe SATA card
• 1U rackmount form factor saves space

Cons

• Sold diskless with no drives included
• Requires PCIe slot for connectivity
• Limited to JBOD functionality only

Good fit if

• You need extra SATA storage for a QNAP NAS
• You have a server with an available PCIe slot
• You want a compact 1U rackmount solution

Skip if

• You require a full NAS with operating system
• You need pre-installed drives for immediate use
• Your system lacks PCIe expansion slots

Verdict: QNAP TL-R400S 4-Bay Rackmount JBOD is a dedicated expansion unit for users needing more SATA space. It fits best in servers with PCIe slots that require simple storage scaling.

4 Also great

Synology 4-Bay Compact Rackmount NAS

Best for: Shallow rack spaces needing dual 1GbE

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 RackStation RS422+ is a 4-bay rackmount NAS designed for space-constrained environments. It features a compact depth of 327.5 mm with handles installed. The unit includes dual 1GbE ports for network redundancy and load balancing. You can expand connectivity using plug-and-play modules for 10GbE. This diskless server supports over 601 MB/s read speeds, making it suitable for stable data transfers in small offices.

Pros

• Compact 327.5 mm depth saves rack space
• Dual 1GbE ports support failover and load balancing
• Supports plug-and-play 10GbE network upgrade modules
• Sequential read throughput exceeds 601 MB/s

Cons

• Sold diskless with no included storage drives
• Base network speed limited to 1GbE without add-ons
• No mention of included RAM or CPU in data

Good fit if

• You need a 4-bay NAS in a shallow rack
• You require dual network ports for reliability
• You plan to add 10GbE connectivity later

Skip if

• You want pre-installed hard drives
• You need built-in 10GbE networking
• You require a 2U rackmount form factor

Verdict: Synology RackStation RS422+ 4-Bay fits users who need a shallow 1U rackmount with dual 1GbE ports. It suits those willing to buy drives separately and add 10GbE modules for higher speeds.

5 Also great

BUFFALO TeraStation 5420RN 4-Bay 32TB

Best for: businesses needing 10GbE and included drives

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 total storage. It includes four 8TB drives pre-configured in RAID 5 for 24TB usable space. The unit features a native 10GbE port for fast transfers and 256-bit drive encryption. You get 3-year warranty coverage. It suits businesses needing secure, high-capacity data storage with hybrid cloud sync options.

Pros

• Native 10GbE port for high-speed data transfers
• 32TB total capacity with four 8TB drives included
• 256-bit drive encryption and two-factor authentication
• Snapshot feature for instant data recovery

Cons

• Heavier at 27.2 pounds compared to lighter alternatives
• Larger footprint at 23 inches wide
• No mention of USB 3.0 or eSATA ports

Good fit if

• You need 10GbE connectivity for fast network transfers
• You require pre-installed drives for immediate deployment
• You want 256-bit encryption for data security

Skip if

• You prefer a lighter unit under 20 pounds
• You need a compact width under 20 inches
• You want a diskless chassis to choose your own drives

Verdict: BUFFALO TeraStation 5420RN 32TB Rackmount NAS is a solid choice for businesses that need heavy-duty storage with 10GbE speeds and included drives. It fits teams prioritizing security features like encryption and snapshots over lightweight design.

6 Also great

BUFFALO TeraStation 4-Bay 8TB Rackmount NAS

Best for: Simple rackmount storage with cloud sync

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 is a 4-bay rackmount NAS with 8TB of pre-installed storage. It features a 2.5GbE port for fast transfers and supports RAID 5, 6, or 0. The unit includes 256-bit drive encryption and hybrid cloud sync options. It ships with hard drives included and offers a 3-year warranty with US support. You get a closed system designed for data protection and easy setup.

Pros

• 2.5GbE network port for high-speed file transfers
• 256-bit drive encryption for secure data storage
• Hybrid cloud sync with Dropbox, Azure, and OneDrive
• 3-year warranty including hard drive coverage
• 8TB capacity with drives included

Cons

• Closed system limits advanced customization
• Only one 2.5GbE port available
• No mention of USB expansion ports

Good fit if

• You need a rackmount NAS with drives pre-installed
• You want hybrid cloud backup options
• You prefer a closed system for simplicity

Skip if

• You require multiple network ports
• You need open-source software flexibility
• You want USB expansion capabilities

Verdict: BUFFALO TeraStation 8TB 4-Bay Rackmount NAS suits users who want a simple, secure rackmount solution with cloud backup. It fits those who value included drives and a closed system over advanced customization.

7 Best premium

QNAP 4-Bay 10GbE Rackmount NAS

Best for: 10GbE networking and redundant power

Drive Bays

4 Bay

Network Connectivity

Two 10GbE, Two 2.5GbE

Processor

AnnapurnaLabs Alpine AL324

RAM Capacity

2GB UDIMM DDR4

Form Factor

Rackmount

View on Amazon: QNAP 4-Bay 10GbE Rackmount NAS Affiliate link

This QNAP unit is a 4-bay rackmount NAS built for dense storage setups. It features a 1.7GHz quad-core processor and 2GB of upgradable DDR4 RAM. The network configuration includes two 10GbE SFP+ ports and two 2.5GbE RJ45 ports for high-speed connectivity. You get four USB 3.2 Gen 1 ports and one PCIe slot for expansion. This model suits users who need redundant power and robust networking in a compact 1U form factor.

Pros

• Dual 10GbE SFP+ network ports
• Redundant power supply included
• Upgradable RAM up to 16GB
• Four USB 3.2 Gen 1 ports

Cons

• Only 2GB base RAM
• Single PCIe Gen 2 x2 slot
• No 2.5GbE ports on all bays

Good fit if

• You need 10GbE uplink speeds
• You require redundant power
• You want a 1U rackmount chassis

Skip if

• You need more than 4 drive bays
• You require 25GbE connectivity
• You want a pre-installed operating system

Verdict: QNAP TS-432PXU-RP-2G 4-Bay Rackmount NAS offers strong networking and power redundancy for users who prioritize connection speed and uptime in a standard rack environment.

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