Synology

Synology 12-Bay Active-Passive Dual Controller NAS SA3400D (Diskless)

Status: Synology 12-Bay Active-Passive Dual Controller…: Unavailable on Amazon as of 2026-10-20 12:24 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 12-Bay Active-Passive Dual Controller NAS SA3400D 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 2026-10-20 12:24 UTC

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By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-20

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

✓ 5-year warranty
✓ 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 12-Bay Active-Passive Dual Controller NAS SA3400D 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

Enterprise-class Performance - Handles data-intensive applications with over 3,500/2,900 MB/s sequential read/write throughput
High Service Availability - Two controller nodes in an active-passive configuration support minute-level failover, minimizing downtime
Built-in Data Protection Solutions - Triple total storage capacity by adding up to two Synology RXD1219sas Expansion Units for 36 total drive bays
5-year warranty

Full Specifications

Size	12U (21 inches) height
Brand	Synology
Color	Black
Material	Metal
Compatible Devices	CPU

Ready to buy?

Amazon shows no buyable offer for Synology 12-Bay Active-Passive Dual Controller… 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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