Asustor
Xpanstor 4 AS5004U, 4 Bay Expansion Unit USB 3.1 Gen 2 Type C NAS Storage Capacity Expander
*Price sourced from Amazon.com. Last updated 2026-05-26. Price and availability subject to change.
Bottom line: The Xpanstor 4 AS5004U, 4 Bay Expansion Unit USB 3.1 Gen 2 Type C NAS Storage Capacity Expander is a mid-pack option worth checking against alternatives in the external storage category, priced around $319.99, rated 3.8★ across 34 verified Amazon reviews. Worth shortlisting, but check close alternatives before deciding.
SpecPicks Verdict
SpecPicks classifies Asustor Xpanstor 4 AS5004U, 4 Bay Expansion Unit USB 3.1 Gen 2 Type… as a mid-pack option worth checking against alternatives in the external storage category, based on 34 verified Amazon reviews and our ranking model that weights rating × review-volume × price-fit. Asustor's positioning sits within the broader category mid-tier. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
Common buyer scenarios for external storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Plug and play
- ✓ Backed by Asustor's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Below-average customer rating — read recent reviews before buying
- ✗ Limited review volume so far — fewer data points on long-term reliability
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Key Features
- Plug and play
- 10Gbps USB 3.2 Gen 2 using Type-C
- Use up to 22TB per drive tray
- Smart power sync helps save power
- Smart fan circuit helps keep hard drives cool
- Supports MyArchive cold backup technology
Full Specifications
| Size | 24cm x 32cm x 21cm |
|---|---|
| Brand | Asustor |
| Color | Black |
| Material | Metal |
| Connectivity | USB |
| Model Number | AS5004U |
| Mounting Type | Floor Mount |
| Built-In Media | 1 year technical support, Asustor 90-AS5004U00-M030 |
| Mfr Part Number | AS5004U |
| Weight Capacity | Maximum weight: 5.1 Pounds |
| Compatible Devices | Server |
| Enclosure Material | Metal |
| Is Assembly Required | No |
| Warranty Description | 3 year manufacturer warranty |
Ready to buy?
Asustor Xpanstor 4 AS5004U, 4 Bay Expansion Unit USB 3.1 Gen 2 Type C NAS Storage Capacity Expander is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-05-26. Price and availability subject to change.
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