Synology

Synology DS418 4-Bay NAS: High-Performance DiskStation

4.6 (2130 reviews)
3.5 inch2.5 inch

Quad-core NAS muscle delivers 226 MB/s reads and dual-1GbE failover for offices that can't afford downtime.

$699.99*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Synology DS418 is a four-bay NAS built around a 64-bit quad-core processor capable of pushing 226 MB/s sequential reads and 170 MB/s sequential writes — figures that meaningfully stress a single gigabit connection and justify the dual 1GbE ports. Those two ports aren't just redundancy; with Link Aggregation configured on a managed switch, the DS418 can serve multiple simultaneous clients without one heavy transfer monopolizing bandwidth. The drive bay array supports 3.5-inch and 2.5-inch SATA HDDs as well as 2.5-inch SATA SSDs, giving operators flexibility across capacity-optimized spinning drives and lower-latency SSD configurations.

For small offices or home labs, the DS418 occupies a reliable middle tier: more capable than entry-level 2-bay units, but priced below prosumer units with 10GbE or NVMe cache slots. It handles simultaneous workloads well — shared network drives, automated backup via Active Backup for Business, and 4K transcoding through Plex or Video Station can coexist without the CPU becoming a chokepoint. The Synology DSM software ecosystem is the force multiplier here: package-based expansion into surveillance, Docker containers, and cloud sync means the hardware can take on new roles as requirements evolve. This is a buy for the 4-8 user office that needs centralized, protected storage with room to grow — without the budget for enterprise iron.

Key Features

Sequential throughput performance at over 226 MB/s reading and 170 MB/s writing

Dual 1GbE ports with failover and Link Aggregation support

Compatible Drive Type-3.5 inch SATA HDD, 2.5 inch SATA HDD, 2.5 inch SATA SSD. "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay

Check Synology knowledge center or YouTube channel for help on product setup and additional information

Check the product specification page for the software or application you want to use

Specifications

Number of Bays
4
Processor
64-bit quad-core
Sequential Read
Over 226 MB/s
Sequential Write
Over 170 MB/s
Network Ports
Dual 1GbE (failover + Link Aggregation)
Compatible Drive Types
3.5" SATA HDD, 2.5" SATA HDD, 2.5" SATA SSD
Drive Interface
SATA III

Pros & Cons

👍 Pros

  • Sequential read throughput exceeds 226 MB/s, saturating a single 1GbE link and making dual-port aggregation genuinely worthwhile.
  • Dual 1GbE with failover means a port or cable failure does not interrupt access — critical for small office shared storage.
  • Hardware 4K transcoding offloads video decode from the main CPU cores, keeping the NAS responsive during media streaming.
  • Four bays provide enough capacity and RAID flexibility (including RAID 6 dual-parity) to protect against simultaneous dual-drive failures.
  • DSM's package ecosystem (Active Backup, Surveillance Station, Docker) turns the DS418 into a multi-role server without additional hardware.

👎 Cons

  • Both ports are 1GbE maximum — there is no 10GbE expansion slot, so the 226 MB/s read ceiling cannot be exceeded regardless of drive speed.
  • The base RAM is non-expandable on the DS418, which can become a constraint when running multiple DSM packages concurrently.
  • No M.2 NVMe SSD cache slot means you cannot add a tiered cache drive to accelerate random I/O as you could on higher-tier Synology units.
  • Four bays limits raw capacity scaling; power users expecting to grow beyond four drives will need to migrate to a larger chassis.

Frequently Asked Questions

The DS418 runs a 64-bit quad-core processor. That core count matters specifically for concurrent tasks — multiple users accessing shares simultaneously, on-the-fly transcoding, and running DSM packages like Surveillance Station or Active Backup without degrading throughput.
Yes. The dual 1GbE ports support both failover and 802.3ad Link Aggregation. With a managed switch and aggregation enabled, real-world sequential reads can hit the rated 226 MB/s; writes top out around 170 MB/s — both figures assuming fast spinning drives or SSDs in the bays.
The DS418 accepts 3.5-inch SATA HDDs, 2.5-inch SATA HDDs, and 2.5-inch SATA SSDs. Note that "compatible" means Synology-tested interoperability — it does not indicate the maximum rated speed of each interface, which remains SATA III (6 Gb/s).
Yes. The quad-core SoC includes hardware-accelerated 4K transcoding, allowing Plex or Synology's Video Station to serve 4K streams without saturating all CPU cores on software decode alone.
With four bays, DSM supports RAID 5 (one drive fault tolerance), RAID 6 (two drive fault tolerance), RAID 10, and Synology Hybrid RAID. RAID 6 is the most resilient but reduces usable capacity by two drive equivalents.