How much does the Synology 5-Bay Expansion Unit DX525 (Diskless) cost on Amazon?

Synology 5-Bay Expansion Unit DX525 (Diskless) is listed on Amazon at $519.99 as of 2026-07-22. Prices change frequently — check the Amazon listing linked from this page for the current price and any active promotions.

Is the Synology 5-Bay Expansion Unit DX525 (Diskless) worth buying?

Synology 5-Bay Expansion Unit DX525 (Diskless) averages, so buyer feedback is well-established. Read recent reviews on Amazon to see how it holds up for use cases similar to yours.

What are the alternatives to the Synology 5-Bay Expansion Unit DX525 (Diskless)?

Synology 5-Bay Expansion Unit DX525 (Diskless) competes with other External Storage products on SpecPicks. Use our Compare tool to view specs side-by-side, or browse the full External Storage category for alternatives.

Who makes the Synology 5-Bay Expansion Unit DX525 (Diskless)?

Synology 5-Bay Expansion Unit DX525 (Diskless) is manufactured by Synology. See all Synology products on SpecPicks via the brand page.

How is the Synology 5-Bay Expansion Unit DX525 (Diskless) shipped and returned?

Synology 5-Bay Expansion Unit DX525 (Diskless) is sold through Amazon. Amazon Prime members generally receive free 1-2 day shipping; non-Prime orders are subject to Amazon's standard shipping rates. Full returns policy applies per Amazon Associate terms.

Synology

5-Bay Expansion Unit DX525 (Diskless)

Name: Synology 5-Bay Expansion Unit DX525 (Diskless)
Brand: Synology
SKU: B0C7VY5KNG
Price: 519.99 USD
Availability: InStock

By SpecPicks Editorial · Verified 2026-07-22

$519.99

Buy on Amazon — $519.99 Compare to similar external storage

*Price sourced from Amazon.com. Last updated 2026-07-22. Price and availability subject to change.

Bottom line: The 5-Bay Expansion Unit DX525 (Diskless) is a niche pick — read recent reviews before buying in the external storage category, priced around $519.99. Read recent reviews carefully before committing.

The Synology DX525 allows users to easily add up to five 2.5-inch or 3.5-inch drives to their setup, thanks to its straight forward installation process and DSM’s intuitive volume management software.

SpecPicks Verdict

SpecPicks classifies Synology 5-Bay Expansion Unit DX525 (Diskless) as a niche pick — read recent reviews before buying in the external storage category, based on our editorial and benchmark analysis and our ranking model that weights rating × review-volume × price-fit. Synology'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

✓ Supports drives on the model's official compatibility list
✓ Backed by Synology's warranty and support channels
✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

✗ 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

Supports drives on the model's official compatibility list
Add 5 additional 3.5"/2.5" SATA HDD/SSD to your DiskStation.
Configure new storage in minutes with Synology DSM's unified toolsA
Backed by Synology's 3-year limited hardware warranty
Plug-and-play compatibility and support for hot-swapping drives

Full Specifications

Size	166 mm x 230 mm x 223 mm
Brand	Synology
Color	Black
Material	Metal, Plastic
Unit Count	1.0 Count
Model Number	DX525
Mounting Type	Tabletop
Mfr Part Number	DX525
Compatible Devices	Desktop, Server
Enclosure Material	Metal, Plastic
Is Assembly Required	No
Warranty Description	3 Year
Item Dimensions D x W x H	8.78"D x 9.06"W x 6.54"H

Ready to buy?

Synology 5-Bay Expansion Unit DX525 (Diskless) 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.

Check price on Amazon →

*Price sourced from Amazon.com. Last updated 2026-07-22. Price and availability subject to change.