Looking Beyond the Synology 4-Bay Rackmount Expansion Unit? 6 Alternatives Worth a Look
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The Synology RX418 provides a compact, diskless 4-bay expansion chassis designed for shallow rack environments. It integrates directly with DiskStation Manager for seamless volume scaling. If you are evaluating synology rx418 4bay expansion unit alternatives, you may need different connectivity or capacity options. This unit lacks built-in storage and relies on Synology’s ecosystem for management.
The alternatives listed here share the 4-bay form factor but offer distinct hardware interfaces and configurations. Some models include pre-installed drives or hardware RAID controllers for direct-attached storage workflows. Others support Thunderbolt 3 or SATA connections for varied professional needs. You should compare these specs against your current infrastructure requirements. This guide helps you find a unit that matches your specific size, interface, and capacity constraints without requiring a full network storage overhaul.
Our top pick: Synology 4-Bay Rackmount Expansion Unit.
How the Alternatives Compare
G-Technology 32TB G-Speed Shuttle
The G-Technology 32TB G-Speed Shuttle replaces network expansion with direct Thunderbolt 3 connectivity. It includes 32TB of pre-installed storage, whereas the Synology RX418 is diskless and requires you to supply your own drives. This unit weighs 16 pounds and measures 9.75 inches in length, making it slightly deeper than the Synology’s 12-inch footprint. It targets video editors who need hardware RAID and high-speed transfer without network overhead. You gain immediate capacity but lose the ability to merge this storage into a Synology volume via DSM. Choose this if you prioritize speed and pre-loaded capacity over network integration.
QNAP 4-Bay USB-C Hardware RAID Enclosure
The QNAP TR-004-US offers a compact, diskless 4-bay enclosure for direct-attached storage. Unlike the Synology RX418, which expands a network volume, this device functions as a standalone USB-C hardware RAID unit. It weighs only 4.08 pounds and measures 8.62 inches long, fitting easily on a desk rather than in a rack. It provides dedicated multi-drive backup pools without requiring network expansion hardware. You sacrifice the seamless online volume expansion found in Synology systems. This option suits users who need isolated, secure backup storage or who do not require merged NAS storage volumes across a network.
QNAP 4-Bay USB-C Direct Attached Storage
The QNAP TR-004 4-Bay USB-C DAS provides 12TB of storage in RAID 5 out of the box. The Synology RX418 is diskless, meaning you must purchase and install drives separately. This QNAP model offers immediate capacity for users who want simple, secure backup storage for their existing NAS setup. It connects via USB-C for direct attachment rather than network expansion. You trade the flexibility of choosing your own drive types and capacities for the convenience of pre-configured storage. This unit is ideal for those who need quick deployment and do not want to manage individual drive installations or compatibility issues.
G-Technology 56TB G-Speed Shuttle Thunderbolt 3
The G-Technology 56TB G-Speed Shuttle Thunderbolt 3 delivers significantly higher capacity than the Synology RX418, which requires you to source four drives. This unit includes 56TB of pre-installed storage in a compact 9.75-inch chassis. It uses Thunderbolt 3 for high-speed data transfer, suitable for mobile 4K and 8K video workflows. The Synology unit is designed for rack mounting and network integration, while this G-Technology drive is a portable direct-attached solution. You gain massive, ready-to-use storage but lose the ability to expand a Synology NAS volume. Pick this if you need portable, high-performance storage for large media files without network dependency.
QNAP TR-004U 4 Bay Rackmount NAS
The QNAP TR-004U 4-Bay Rackmount NAS is designed for QNAP users needing rack expansion, whereas the Synology RX418 is built for Synology DSM integration. This QNAP unit measures 21.3 inches long and 7.87 inches high, making it larger and heavier than the Synology’s 17-inch depth. It provides hardware RAID control and secure drive trays, similar to the Synology’s plug-and-play design. However, it does not integrate with DiskStation Manager. You must manage it through QNAP’s QTS operating system. This alternative is best for users already in the QNAP ecosystem who need rack-mounted storage without the cost of buying drives separately.
QNAP 4 Bay 1U Rackmount SATA JBOD
The QNAP TL-R400S 4-Bay Rackmount SATA JBOD is a diskless expansion tool for users who already have drives. Like the Synology RX418, it does not include storage media. It connects via SATA for simple storage growth in a rack environment. This unit measures 21.3 inches long and 7.05 inches high, fitting standard rack spaces. It offers JBOD functionality rather than the hardware RAID or volume expansion features of the Synology. You gain a cost-effective way to add capacity using existing drives. Choose this if you need simple SATA storage expansion and do not require the advanced volume management or DSM integration provided by the Synology RX418.
Quick picks
Our 7 picks
Synology 4-Bay Rackmount Expansion Unit
Best for: shallow-rack Synology storage expansion
- Drive Bays
- 4-Bay
- Included Storage
- Diskless
- Dimensions
- 17 × 11.4 × 1.73 inches
- Weight
- 9.44 pounds
View on Amazon: Synology 4-Bay Rackmount Expansion Unit Affiliate link
This 4-bay rackmount expansion unit adds storage drives to your existing deployment through Synology DiskStation Manager (DSM). It features a compact 12-inch depth to fit 2-post racks and wall-mount racks. You get online volume expansion and deep sleep mode across four drive bays in a 9.44-pound chassis. It suits your setup if you require extra capacity.
Pros
- Compact 12-inch depth fits 2-post and wall-mount racks
- Supports online volume expansion via Synology DiskStation Manager
- Energy-saving deep sleep mode
- Plug-and-play design adds four drive bays
Cons
- Ships diskless without storage drives included
- Requires a compatible host system rather than functioning as standalone storage
Good fit if
- You need four additional bays in a shallow 2-post or wall-mount rack.
- You manage storage systems through Synology DiskStation Manager.
- You want online volume expansion without replacing your main system.
Skip if
- You need an independent standalone NAS system.
- You require pre-installed hard drives included out of the box.
Verdict: Synology 4-Bay Rackmount Expansion Unit delivers 4-bay plug-and-play volume scaling in a compact 12-inch depth chassis. It provides direct DiskStation Manager integration for users expanding shallow rack infrastructure.
G-Technology 32TB G-Speed Shuttle
Best for: Thunderbolt 3 video production workflows
- Drive Bays
- 4-Bay
- Included Storage
- 32TB
- RAID Support
- 0, 1, 5, 10
- Hardware Interface
- Thunderbolt
- Dimensions
- 9.75 × 6.85 × 10.5 inches
- Weight
- 16 pounds
View on Amazon: G-Technology 32TB G-Speed Shuttle Affiliate link
This is a 4-bay Thunderbolt 3 storage unit with 32TB of capacity. It features built-in hardware RAID for RAID 0, 1, 5, and 10 configurations. The transportable design weighs 16 pounds and measures 9.75 inches in length. It supports multi-stream 4K and 8K workflows. You should consider this if you need high-speed data access for video production.
Pros
- 32TB storage capacity
- Thunderbolt 3 interface
- Hardware RAID support
- Transportable design
Cons
- Limited to 32TB capacity
- No mention of USB connectivity
- Heavier than rackmount alternatives
Good fit if
- You need Thunderbolt 3 speeds
- You work with 4K or 8K video
- You require hardware RAID
Skip if
- You need more than 32TB
- You prefer USB connectivity
- You want a rackmount form factor
Verdict: G-Technology 32TB G-Speed Shuttle Thunderbolt 3 offers a compact, high-speed solution for video editors needing hardware RAID and Thunderbolt 3 connectivity.
QNAP 4-Bay USB-C Hardware RAID Enclosure
Best for: direct-attached multi-drive external hardware RAID backup
- Drive Bays
- 4-Bay
- Included Storage
- Diskless
- RAID Support
- RAID 0, 1, 5, JBOD
- Dimensions
- 8.62 × 6.31 × 6.63 inches
- Weight
- 4.08 pounds
View on Amazon: QNAP 4-Bay USB-C Hardware RAID Enclosure Affiliate link
This unit is a four-bay direct-attached storage enclosure featuring a USB Type-C connection and integrated hardware RAID supporting RAID 0, 1, 5, and JBOD. You can attach it to Windows, macOS, or Linux systems, or link it directly to a compatible network unit for external storage pools. It suits you if you need multi-drive capacity via direct cable connection rather than a dedicated network link.
Pros
- Hardware RAID options including RAID 0, 1, 5, JBOD, and individual modes
- USB Type-C connectivity with included USB Type-C to Type-A cable
- Four lockable 3.5-inch SATA drive bays
- Compatibility with Windows, macOS, and Linux systems
Cons
- Internal drive transfer interface is limited to SATA 3Gb/s
- Storage pool cannot be merged into an existing connected NAS volume
- Cannot run or host NAS applications on the unit
Good fit if
- You need direct-attached 4-bay hardware RAID over USB Type-C.
- You want external backup storage for Windows, macOS, Linux, or select QNAP units.
- You require physical security via lockable drive bays.
Skip if
- You need to expand an existing NAS storage pool into a single combined volume.
- You require SATA 6Gb/s drive interface speeds.
- You want an independent network-attached device capable of hosting standalone applications.
Verdict: QNAP 4-Bay USB-C Hardware RAID DAS provides dedicated multi-drive hardware RAID over USB without requiring dedicated network expansion hardware. It works well for isolated backup pools, provided you do not need merged NAS storage volumes.
QNAP 4-Bay USB-C Direct Attached Storage
Best for: Quick NAS expansion with pre-configured RAID
- Drive Bays
- 4-Bay
- Included Storage
- 12TB
- RAID Support
- RAID 0, 1, 5, JBOD
View on Amazon: QNAP 4-Bay USB-C Direct Attached Storage Affiliate link
The QNAP TR-004 is a direct-attached storage unit with four drive bays. It comes with 12TB of pre-installed Seagate IronWolf drives configured in RAID 5. This bundle includes a 3-year data recovery plan. It connects via USB 3.2 Gen 1. You can use it for backup or to expand NAS capacity. It supports SATA 3Gb/s drives and features lockable bays.
Pros
- 12TB pre-installed storage in RAID 5
- USB Type-C connection for Windows, macOS, Linux
- Lockable drive bays for security
- 3-year Rescue Data Recovery Services included
Cons
- USB 3.2 Gen 1 limits transfer speeds
- No built-in network ports for direct NAS integration
- Requires USB cable for connection
Good fit if
- You need extra storage for a QNAP NAS
- You want pre-configured RAID 5 without setup
- You use Windows, macOS, or Linux
Skip if
- You need high-speed 10GbE connectivity
- You want a standalone NAS with network ports
- You prefer USB 3.2 Gen 2 speeds
Verdict: The QNAP TR-004 4-Bay USB-C DAS offers immediate capacity with 12TB in RAID 5. It fits users who need simple, secure backup storage for their existing NAS setup.
G-Technology 56TB G-Speed Shuttle Thunderbolt 3
Best for: portable 4K and 8K video workflows
- Drive Bays
- 4-Bay
- Included Storage
- 56TB
- Hardware Interface
- Thunderbolt
- Dimensions
- 9.75 × 6.85 × 10.5 inches
View on Amazon: G-Technology 56TB G-Speed Shuttle Thunderbolt 3 Affiliate link
This is a transportable 4-bay storage unit designed for demanding workflows. It offers 56TB of capacity and sustained transfer rates up to 1000MB/s. The device connects via Thunderbolt and includes an ev Bay Adapter. It is optimized for multi-stream 4K and 8K video editing. You should consider this if you need high capacity and fast data movement in a portable form factor.
Pros
- 56TB storage capacity
- Sustained transfer rates up to 1000MB/s
- Optimized for 4K and 8K workflows
- Includes ev Bay Adapter
Cons
- No built-in hard drives included
- Thunderbolt connection limits compatibility
- Larger footprint than rackmount units
Good fit if
- You need high capacity for video editing
- You require fast sustained transfer speeds
- You want a portable 4-bay solution
Skip if
- You need a rackmount expansion unit
- You prefer USB Type-C connectivity
- You want pre-installed drives
Verdict: G-Technology 56TB G-Speed Shuttle Thunderbolt 3 provides high capacity and speed for mobile video production. It suits professionals who need portable, high-performance storage for large media files.
QNAP TR-004U 4 Bay Rackmount NAS
Best for: QNAP NAS users needing rack expansion
- 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 unit designed to expand storage for QNAP NAS systems. It features a USB 3.0 Type-C port for faster data transfer and supports up to four SATA drives. You can configure RAID groups using dip switches for hardware control or via the Storage & Snapshots Manager on a QNAP NAS. This unit serves as a reliable expansion solution for users needing additional disk space.
Pros
- USB 3.0 Type-C port for faster data transfer
- Supports up to four SATA drives
- Dip switches for hardware RAID configuration
- Lockable hard drive trays for security
Cons
- Requires a QNAP NAS for full software RAID management
- Larger physical dimensions than desktop alternatives
- No mention of Thunderbolt connectivity
Good fit if
- You own a QNAP NAS and need more storage
- You prefer hardware RAID configuration via dip switches
- You have rack space available for expansion
Skip if
- You use a non-QNAP NAS system
- You need a portable or desktop form factor
- You require Thunderbolt 3 connectivity
Verdict: The QNAP TR-004U 4-Bay Rackmount Expansion is a practical choice for QNAP users needing rack-mounted storage. It fits those who value hardware RAID control and secure drive trays.
QNAP 4 Bay 1U Rackmount SATA JBOD
Best for: Rackmount SATA 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 enclosure designed to expand storage for QNAP NAS systems, Windows, and Linux computers. It features four 3.5-inch SATA bays and includes a QXP-400eS-A1164 PCIe SATA card for connection. This diskless unit supports SATA 6Gb/s speeds, offering a high-performance JBOD solution for users needing additional drive capacity in a rack environment.
Pros
- Four 3.5-inch SATA bays for drive expansion
- Includes QXP-400eS-A1164 PCIe SATA card
- Supports SATA 6Gb/s interface speeds
- 1U rackmount form factor for server racks
Cons
- Diskless design requires you to supply your own drives
- Limited to JBOD mode without RAID hardware
- Requires a PCIe slot for the included expansion card
Good fit if
- You need extra SATA storage for a QNAP NAS
- You are setting up a 1U rackmount server
- You want a dedicated JBOD expansion unit
Skip if
- You need pre-configured RAID hardware support
- You prefer a tower form factor over rackmount
- You want a unit with drives included
Verdict: QNAP TL-R400S 4-Bay Rackmount SATA JBOD is a practical expansion tool for users who already have drives and need simple SATA storage growth in a rack.
Specifications side by side
| Spec | Synology 4-Bay Rackmount Expansion Unit | G-Technology 32TB G-Speed Shuttle | QNAP 4-Bay USB-C Hardware RAID Enclosure | QNAP 4-Bay USB-C Direct Attached Storage | G-Technology 56TB G-Speed Shuttle Thunderbolt 3 | QNAP TR-004U 4 Bay Rackmount NAS | QNAP 4 Bay 1U Rackmount SATA JBOD |
|---|---|---|---|---|---|---|---|
| Drive Bays | 4-Bay | 4-Bay | 4-Bay | 4-Bay | 4-Bay | 4 Bay | 4-Bay |
| Network Connectivity | not stated | not stated | not stated | not stated | not stated | USB 3.0 Type-C | not stated |
| Included Storage | Diskless | 32TB | Diskless | 12TB | 56TB | not stated | Diskless |
| RAID Support | not stated | 0, 1, 5, 10 | RAID 0, 1, 5, JBOD | RAID 0, 1, 5, JBOD | not stated | not stated | not stated |
| Form Factor | not stated | not stated | not stated | not stated | not stated | Rackmount | Rackmount |
| Hardware Interface | not stated | Thunderbolt | not stated | not stated | Thunderbolt | not stated | SATA |
| Number of Bays | 4-Bay | 4-Bay | 4-Bay | 4-Bay | 4-Bay | 4-Bay | 4-Bay |
| Dimensions | 17 × 11.4 × 1.73 inches | 9.75 × 6.85 × 10.5 inches | 8.62 × 6.31 × 6.63 inches | not stated | 9.75 × 6.85 × 10.5 inches | 21.3 × 16.5 × 7.87 inches | 21.3 × 16.3 × 7.05 inches |
| Weight | 9.44 pounds | 16 pounds | 4.08 pounds | not stated | not stated | 4.41 pounds | not stated |
| Size | 44 mm x 480 mm x 325 mm | 32TB | 4 Bay | 4 Bay | 56TB | 4 Bay | 4 Bay |
| Color | black | Black | Diskless | Black | not stated | Black | black |
| Model | RX418 | 0G10077 | TR-004-US | TR-004 | 0G10401 | TR-004U | TL-R400S |
If you also configure maker equipment, review our specs on ortur laser engraver area expansion alternatives.
Frequently asked questions
Can I use a QNAP expansion unit with my Synology NAS?
No, you cannot merge storage volumes across different brands. The Synology RX418 integrates directly with DiskStation Manager for unified volume scaling. QNAP units like the TR-004U or TL-R400S provide hardware RAID or JBOD connectivity but remain isolated. They serve as direct-attached storage or separate rack expansions rather than expanding your Synology pool.
What is the difference between the Synology RX418 and the G-Technology Shuttle?
The Synology RX418 is a diskless expansion chassis that scales your existing NAS volume. The G-Technology Shuttle is a self-contained Thunderbolt 3 drive with pre-installed storage, such as 32TB or 56TB. The G-Technology unit offers hardware RAID and high-speed connectivity for video workflows, while the Synology unit focuses on network-based capacity growth.
Does the QNAP TR-004U support rack mounting?
Yes, the QNAP TR-004U is designed as a 4-bay rackmount NAS. It measures 21.3 inches in length and 7.87 inches in height. This form factor fits standard rack infrastructure, making it suitable for QNAP users needing dedicated rack expansion with hardware RAID control and secure drive trays.
Is the QNAP TL-R400S suitable for users who already have hard drives?
Yes, the QNAP TL-R400S is a SATA JBOD expansion tool. It is diskless and designed for users who already possess drives. It provides simple SATA storage growth in a rackmount chassis. This makes it a practical choice for expanding capacity without purchasing pre-loaded storage units.
Which alternative is best for Thunderbolt 3 workflows?
The G-Technology G-Speed Shuttle is the best choice for Thunderbolt 3 workflows. It offers high-speed connectivity and hardware RAID for video editors. The 32TB and 56TB models provide compact, portable storage for 4K and 8K media. This unit replaces network expansion with direct, high-bandwidth connectivity.
Can I use a QNAP USB-C DAS as a Synology expansion?
You can use it as additional storage, but not as a merged volume. The QNAP TR-004 or TR-004-US provides direct-attached hardware RAID over USB. It works well for isolated backup pools. However, it does not integrate with DiskStation Manager to expand your existing Synology storage volumes.
What are the dimensions of the Synology RX418 compared to other options?
The Synology RX418 measures 17 inches in length and 11.4 inches in width. It has a shallow depth of 12 inches, fitting compact rack spaces. In comparison, the QNAP TR-004U is larger at 21.3 inches long. The G-Technology Shuttle is wider but shorter in length, measuring 9.75 inches.