Synology

Synology 24 Bay Expansion FlashExpansion FX2421 (Diskless)

Status: Synology 24 Bay Expansion FlashExpansion FX2421: Unavailable on Amazon as of 2026-10-21 04:20 UTC. SpecPicks has no in-stock listing with matching specs on file; the search below lists current offers. eBay sellers may still list this model new or used.

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Bottom line: The Synology 24 Bay Expansion FlashExpansion FX2421 is a specs-and-price decision rather than a crowd-consensus one in the external storage category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

Unavailable on Amazon as of 2026-10-21 04:20 UTC

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By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-21

Mike Perry — Hardware researcher since 2014. For external drives and portable storage, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. About the author →

Pros & Cons

Pros

✓ Plug-and-play design and fast rack fixing lock support make upgrading storage space easy
✓ Backed by Synology's warranty and support channels

Cons

✗ Check the listed dimensions, connectors and platform compatibility against your setup before ordering
✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

SpecPicks Verdict

SpecPicks scored Synology 24 Bay Expansion FlashExpansion FX2421 using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. Synology's external storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

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 retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

24 additional drive bays available for online volume expansion on the fly for your Synology FlashStation
Modularized components including redundant power supplies and system fans ensure maximum uptime
Plug-and-play design and fast rack fixing lock support make upgrading storage space easy
Backed by Synology’s 5-year limited warranty

Full Specifications

Size	88 mm x 482 mm x 724 mm
Brand	Synology
Color	Multicolor
Material	Metal
Compatible Devices	Servers

Ready to buy?

Amazon shows no buyable offer for Synology 24 Bay Expansion FlashExpansion FX2421 at the last check. An Amazon search for this model lists current offers. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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