Loading the product…
Loading the product…
NAS Storage Capacity Expander
$377.43
Special order — estimated available by September 10, 2026.
Genuine ASUSTOR through authorized distribution — TAA country-of-origin verified and NDAA §889 screened before checkout.
Faster and Easier!
The all-new Xpanstor 4 adopts USB 3.2 Gen 2 with a Type-C socket. USB 3.2 Gen 2 transfers files even faster with the ability to transfer of up to 10 Gbps. The Xpanstor is also backward compatible with ASUSTOR NAS devices that support USB 3.2 Gen 1 and will operate at the 5 Gbps maximum those devices support. Use the Xpanstor to expand the capacity of your NAS to grow your workflow as needed.
MyArchive Welcome!
The Xpanstor 4 supports MyArchive cold storage technology. Directly insert a MyArchive hard drive into an available bay to access data, making data access extremely convenient. Use MyArchive to also set up schedules for backing up with automatic mounting and unmounting, making your backups simpler and more convenient.
Sleeps When Your NAS Sleeps
When a connected NAS enters sleep mode or shuts down, the Xpanstor will enter sleep mode simultaneously to save energy and hardware longevity. LED brightness in the Xpanstor 4 also synchronizes with your NAS, ensuring no bright lights when your NAS is off.
Cool and Quiet
The internal fan found inside the Xpanstor 4 automatically adjusts its speed according to hard drive temperatures and maintains a balance between sound and performance.
Stable USB Connection
The Xpanstor 4 has a specially designed USB-C connector and cable. The cable included with your Xpanstor 4 locks in with your expansion unit with two screws on each side of the cable to lock it into the expansion unit to prevent it from being accidentally disconnected. The included USB cable is not proprietary and replaceable, ensuring greater longevity and lower e-waste.
PC-Friendly!
The Xpanstor 4 works well as a DAS solution as well. Plug an Xpanstor into a computer to access up to four independent drives that can be used by a Windows, Mac or Linux machine for applications that include, but are not limited to storage, drive cloning and diagnostics.
First-Class Product Warranty
All ASUSTOR NAS products come with a 3-year warranty. ASUSTOR continues to make customer service a priority in providing the highest standard of after-sales service and technical support.
More from the Manufacturer
Faster and Easier!
The Xpanstor 4 adopts USB 3.2 Gen 2 with a Type-C socket. USB 3.2 Gen 2 transfers files with up to 10 Gbps. The Xpanstor 4 is also backward compatible with ASUSTOR NAS devices that support USB 3.2 Gen 1 and will operate at the 5 Gbps maximum those devices support.
Number of Expansion Units Supported
NAS models that are able to support 3 simultaneous AS5004U expansion units: AS33 / AS52 / AS53 / AS54 / AS66 / AS71 Series
NAS models that are able to support 2 simultaneous AS5004U expansion units: AS11 / AS67 / FS67 / AS65 Series
Hardware Specifications
Flash Memory: 32MB Flash
Expansion: USB 3.2 Gen 2 Type C
HDD: 4 x SATA3 6Gb/s; 3.5"/2.5" HDD/SSD
Maximum Internal Raw Capacity: 88 TB (22 TB HDD x 4, Capacity may vary by RAID types)
Supports Hot Swappable Drives
Storage Management
Support Multiple Volumes with Spare Drives
Volume Type: Single disk, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10
Support for Online RAID Level Migration
Support for RAID Capacity Expansion
MyArchive Welcome!
The Xpanstor 4 supports MyArchive cold storage technology. Directly insert a MyArchive hard drive into an available bay to access data, making data access extremely convenient. Use MyArchive to also set up schedules for backing up with automatic mounting and unmounting, making your backups simpler and more convenient.
Cool and Quiet
The internal fan found inside the Xpanstor 4 automatically adjusts its speed according to hard drive temperatures and maintains a balance between sound and performance.
Stable USB Connection
The Xpanstor 4 has a specially designed USB-C connector and cable. The cable included with your Xpanstor 4 locks in with your expansion unit with two screws on each side of the cable to lock it into the expansion unit to prevent it from being accidentally disconnected. The included USB cable is not proprietary and replaceable, ensuring greater longevity and lower e-waste.
PC-Friendly!
The Xpanstor 4 works well as a DAS solution as well. Plug an Xpanstor 4 into a computer to access up to four independent drives that can be used by a Windows, Mac or Linux machine for applications that include, but are not limited to storage, drive cloning and diagnostics.
Limited Warranty: 3 Year
About ASUSTOR Founded in 2011, ASUSTOR Inc. was established via direct investment from ASUSTeK Computer Inc . The ASUSTOR brand name was created as a portmanteau of “ASUS” and “Storage”. ASUSTOR is a leading innovator and provider of private cloud storage (network attached storage) and video surveillance (network video recorder) solutions, also specializing in the development and integration of related firmware, hardware and applications. We are devoted to providing the world with an unparalleled user experience and the most complete set of network storage solutions possible. Company Culture At ASUSTOR we believe that our employees are our most treasured assets. We encourage creativity and welcome different voices and ideas. We are committed to creating a diverse, welcoming, happy and energetic work environment, providing a flexible space that allows you to employ your creativity and discover your potential. At ASUSTOR you will be able to see our staff's unmatched devotion to the design of network attached storage (NAS), crafting products with a unique blend of hardware and software integration. Our mission is to launch an international brand and to become a global leader in digital storage. Join us for a chance to work with the leading talents in the field, while receiving ample opportunities to display your abilities and grow together with the company.
| Controllers | |
|---|---|
| Controller Type | Serial ATA/600 |
| RAID Supported | Yes |
| RAID Levels | 0, 1, 5, 6, 10, JBOD |
| General Information | |
| Manufacturer | ASUSTOR |
| Manufacturer Part Number | AS5004U |
| Brand Name | ASUSTOR |
| Product Line | Xpanstor 4 |
| Product Model | AS5004U |
| Product Name | Xpanstor 4 AS5004U NAS/DAS Storage System |
| Packaged Quantity | 1 |
| Product Type | NAS/DAS Storage System |
| I/O Expansions | |
| Number of Total Expansion Bays | 4 |
| Number of 2.5"/3.5" Bays | 4 |
| Interfaces/Ports | |
| Total Number of USB Ports | 1 |
| Physical Characteristics | |
| Height | 6.7" |
| Width | 6.9" |
| Depth | 9.1" |
| Weight (Approximate) | 4.48 lb |
| Power Description | |
| Maximum Power Supply Wattage | 90 W |
| Software | |
| Operating System | ADM 4.2.4 |
| Storage | |
| Number of Hard Drives Supported | 4 |
| Number of Hard Drives Installed | 0 |
| Total Hard Drive Capacity Supported | 88 TB |
| Number of Solid State Drive Supported | 4 |
| Number of Solid State Drive Installed | 0 |
| Flash Memory Capacity | 32 MB |
| Warranty | |
| Limited Warranty | 3 Year |
| Miscellaneous | |
| Package Contents |
|
Matched on SATA
Send a bill of materials or part numbers — we confirm stock, TAA country of origin and a below-market total. No payment up front.
