# Synology DS1825+ Review: Who Should Buy Synology's 8-Bay Plus Model

Eight bays, ECC memory and a PCIe slot make the DS1825+ a serious storage server. This review sets out which buyers will actually use those features, and which would be paying for empty bays.

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**Verdict:** The Synology DS1825+ suits a small business, growing surveillance system or large media archive that will genuinely use eight drive bays. A NAS (network-attached storage, an always-on storage device on your network) gives multiple computers and phones access to shared storage, like a private filing room connected to the network. Its strongest reasons to buy are ECC memory, networking upgrades, SSD cache support, expansion to 18 drives and Synology's backup software, but most homes need a smaller system.

> **Note:** In short: Choose the DS1825+ for substantial storage growth, business backup or a camera system with more than a handful of cameras. Do not choose it primarily for Plex 4K transcoding or if family photos, phone backups and a modest media library will fit comfortably in fewer bays.

Choose the DS1825+ if eight bays, ECC memory and future network expansion solve a defined workload. Look elsewhere if you are paying for unused bays or expect fast 4K video conversion from the NAS.

## DS1825+ Specifications

- **CPU:** AMD Ryzen V1500B, 64-bit x86
- **Cores / threads:** 4 / 8
- **Clock speed:** 2.2 GHz
- **Memory (installed):** 8 GB DDR4 ECC SODIMM, 1 module
- **Memory (maximum):** 32 GB, 16 GB × 2
- **Drive bays:** 8 × 3.5-inch SATA HDD or 2.5-inch SATA SSD
- **M.2 NVMe slots:** 2 × M.2 2280 NVMe SSD
- **Maximum drives with expansion:** 18 with two DX525 units
- **Network ports:** 2 × RJ-45 2.5GbE
- **PCIe slot:** 1 × Gen3 x8 slot, x4 link
- **USB ports:** 3 × USB 3.2 Gen 1
- **RAID types:** SHR, Basic, JBOD, RAID 0, 1, 5, 6 and 10
- **Power (Synology figures, with labels):** 60.1 watts Access; 18.34 watts HDD Hibernation
- **Noise (Synology figure):** 23.8 dB(A)
- **Fans:** 2 × 120 mm
- **Dimensions:** 166 mm × 343 mm × 243 mm
- **Weight:** 6 kg
- **Operating temperature:** 0 to 40°C
- **Warranty:** 3 years, extendable to 5 years with EW201

Need to Know IT reviewed the specifications, data sheet and DSM 7.3 drive policy published by Synology (a Taiwanese maker of network storage devices), together with the compatibility sheet published by Plex (a media server app for streaming your own films and TV to your devices). This is a researched review rather than a hands-on test, so Synology's laboratory performance, power and noise figures are identified as such.

## Who the DS1825+ Is For

The DS1825+ is for a buyer who can explain why five bays will not be enough. Strong fits include a small business consolidating file storage and endpoint backups, a growing camera installation, or a large media and project archive that needs room for more drives over time.

Eight bays provide more choices for usable capacity and drive-failure protection than a smaller enclosure. They can also let a buyer begin with some bays empty, although the storage plan should account for current data, expected growth, protection and an independent backup rather than treating empty slots as the goal.

A typical household with family photos, phone backups and a modest media collection is unlikely to use the chassis well. In that situation, fewer bays reduce the space, complexity and number of drives involved without removing the core file-sharing and backup functions.

The Plus-line extras matter most when the NAS becomes infrastructure rather than an occasional file cupboard. Buyers comparing the broader range can use the [current Synology NAS lineup](https://needtoknowit.com.au/blog/synology-nas-lineup-every-current-model-price-and-spec/) to place the eight-bay model in context.

## Hardware: What Eight Bays and a Ryzen V1500B Get You

The AMD Ryzen V1500B provides four cores, eight threads and a 2.2 GHz clock speed. That combination supports file serving, backup jobs, containers and modest virtualisation, but the CPU should not be mistaken for a video-transcoding specialist.

The DS1825+ ships with 8 GB of DDR4 ECC memory and has two memory slots supporting up to 32 GB. ECC, or error-correcting code, memory detects and corrects single-bit memory errors, much like a proofreader fixing a one-letter typo before it reaches the final document. That is valuable when business files, backup indexes and long-running services share the system.

Memory expansion has a support condition. Synology says it may not provide complete product warranty or technical support when non-Synology memory modules are used, which is not the same as saying that third-party memory automatically voids the entire warranty.

The eight SATA bays accept 3.5-inch hard drives or 2.5-inch SATA SSDs (solid-state drives, which have no moving parts) and are hot-swappable. Hot-swapping means a supported drive can be replaced without shutting down the system, like changing one wheel on a multi-axle trailer while the remaining wheels keep it supported. The two M.2 slots are not hot-swappable.

Synology recommends up to eight virtual machine instances for the DS1825+. A virtual machine is a complete simulated computer running inside the NAS, like placing several separate offices inside one building, while still sharing the underlying hardware.

**Pros**
- Eight SATA bays with expansion to 18 drives through two DX525 units
- 8 GB of ECC memory installed, expandable to 32 GB
- Two built-in 2.5GbE ports plus a PCIe slot for faster networking
- Two M.2 slots for SSD cache, with supported storage-pool capability
- DSM backup, file-sharing, container and surveillance applications

**Cons**
- No Plex hardware-accelerated transcoding support listed for this model
- Synology applies stricter compatibility rules to M.2 SSDs than to SATA drives
- Faster than 2.5GbE networking requires a compatible add-in card
- Eight bays are unnecessary for many household storage plans

## Drive Compatibility and SSD Cache

Third-party hard drives and 2.5-inch SATA SSDs can be used to create storage pools on this 2025 Plus model when it runs DSM 7.3. Synology recommends drives on its compatibility list, and drives explicitly placed on its incompatibility list remain unsupported.

This policy is more flexible than the original rules for the 2025 Plus range, but M.2 SSDs remain more restricted. M.2 describes the small, gum-stick-shaped connector and module size, while NVMe is a fast solid-state storage protocol, like an express lane between storage and the processor.

An SSD cache keeps frequently requested data on faster solid-state storage, like putting the files used every day on a desk instead of repeatedly walking to the archive room. Synology says cache works only with selected compatible SSDs, while creating an M.2 storage pool requires Synology-verified SSDs. Buyers planning either use should check the model-specific compatibility list before ordering drives.

The practical consequence is that a buyer can choose more freely among SATA hard drives than among M.2 SSDs. The [SSD cache and all-flash NAS guide](https://needtoknowit.com.au/blog/ssd-cache-all-flash-nas-australia/) can help determine whether a workload will benefit from cache at all.

The DS1825+ supports two file systems (the rules a storage device uses to organise and retrieve data, rather like the catalogue system in a library): Btrfs (a modern file system that supports snapshots) and ext4 (a long-established Linux file system). RAID is a method of spreading data across multiple drives so the system can keep operating after certain drive failures, like distributing a document across several guarded cabinets. SHR (Synology Hybrid RAID) is Synology's flexible RAID arrangement, comparable to building with blocks of different sizes while letting the system work out a practical layout.

Available arrangements include SHR, Basic, JBOD and RAID 0, 1, 5, 6 and 10. The right option depends on usable capacity, drive count and acceptable failure risk, which the [RAID explanation](https://needtoknowit.com.au/blog/nas-raid-explained/) covers in detail. RAID maintains availability after specified drive failures, but it does not replace a separate backup.

## Networking and Expansion

The two built-in 2.5GbE ports are a sensible starting point for multi-user storage. 2.5GbE means a network link rated at 2.5 gigabits per second, like a wider pipe than an ordinary gigabit connection, although actual file speed also depends on drives, clients, switches and workload.

The ports support link aggregation with failover and load balancing. Link aggregation joins network connections for resilience or distributes traffic across them, like opening two checkout lanes for several customers. It can increase combined throughput for multiple users, but it does not automatically make one ordinary file transfer twice as fast.

A PCIe slot provides the important upgrade path. PCIe is an internal expansion connection for add-in hardware, like an empty utility bay that can accept a specialised tool. Synology lists compatible 10GbE RJ-45 and 10/25GbE SFP+/SFP28 network cards, so buyers should confirm the exact card against its compatibility list.

Synology reports sequential read and write performance of up to 2,239 MB/s and 1,573 MB/s from its internal testing. Sequential performance measures large, orderly transfers, like reading a book from beginning to end rather than jumping between pages. Those figures used SSDs and networking faster than the two built-in 2.5GbE ports, so they should not be treated as expected out-of-box speed.

Capacity can expand from eight drives to 18 by attaching two separately sold DX525 five-bay units. Expansion can extend the life of a deployment, but buyers should still compare the cost and operational complexity with choosing an appropriate initial drive capacity.

## Software, Backup and Surveillance

DSM (DiskStation Manager) is Synology's operating system and acts like the control desk for storage, users, backups and installed applications. Its main value on the DS1825+ is bringing file sharing, protection and administration into one interface rather than leaving the buyer to assemble those functions from unrelated tools.

Hyper Backup handles scheduled backup destinations, while Snapshot Replication preserves point-in-time versions that can help recover earlier data. Active Backup Suite protects supported computers, servers, virtual machines and cloud services without separate per-device software licence fees. Synology Drive and Synology Photos provide private file-sync and photo-management functions, while C2 Storage is an optional subscription service.

Container Manager supports Docker (software that runs applications in isolated containers without changing the core operating system). Containers are like separate workspaces in one workshop: each keeps its own tools and materials while sharing the building. Virtual Machine Manager is available when a workload needs a complete guest operating system rather than a lighter container, and the [Docker and virtualisation guide](https://needtoknowit.com.au/blog/docker-virtualisation-nas-australia/) explains that distinction.

Surveillance Station includes two camera licences, with additional licences required for more cameras and devices. Synology suggests up to 32 channels of 4K H.264 video at 320 frames per second in total for this model. Treat that as a vendor ceiling rather than a design target, because camera resolution, frame rate, retention and other NAS workloads all affect a real deployment.

A camera buyer should calculate recording capacity and licence needs before choosing drives. The [NAS surveillance compatibility guide](https://needtoknowit.com.au/blog/nas-surveillance-camera-compatibility-guide-australia/) covers the questions to ask about cameras, retention and storage.

Plex is the major media limitation. Transcoding (converting a video in real time when the viewing device cannot play the original) is like an interpreter translating during a conversation. Plex lists software transcoding for SD and 720p, some support at 1080p, no 4K software transcoding and no hardware-accelerated transcoding for the DS1825+.

The NAS therefore suits Plex direct play, where the television or app receives the original file without conversion, like delivering a sealed parcel without repacking it. It can handle light software conversion, but buyers needing on-the-fly 4K conversion should choose a different processing platform. Plex hardware acceleration also requires Plex Pass on supported hardware, as explained in the [Plex hardware transcoding guide](https://needtoknowit.com.au/blog/plex-hardware-transcoding-on-nas-complete-australia-guide/).

## DS1825+ vs DS1825neo+ and Smaller Synology Models

The DS1825neo+ uses the same processor, eight drive bays, network ports and PCIe slot as the DS1825+, but ships with 4 GB of non-ECC memory instead of 8 GB of ECC memory. Both have a three-year hardware warranty, so the choice turns principally on the initial memory configuration and whether error correction matters to the workload. The [Synology NEO range explainer](https://needtoknowit.com.au/blog/synology-neo-nas-range-explained/) covers that range in more detail.

The DS1525+ is the smaller Plus option when five bays provide enough current capacity and growth room. Its [dedicated DS1525+ review](https://needtoknowit.com.au/blog/synology-ds1525-plus-review-australia/) is the more relevant next comparison for buyers who cannot justify eight bays.

## Limitations to Know Before You Buy

The DS1825+'s most important limitation is workload mismatch. Empty bays have value only when there is a credible capacity or protection plan for them, and buying eight bays for a modest household archive creates cost and complexity without improving the outcome.

Its media weakness is equally specific. Plex's compatibility data does not list hardware-accelerated transcoding, and 4K software transcoding is marked unsupported, so direct play should be part of the media design.

M.2 flexibility is narrower than SATA-drive flexibility. A buyer who assumes any consumer NVMe SSD will work for cache or an M.2 storage pool could order unusable parts, making a compatibility check part of the purchase rather than a troubleshooting step.

The built-in network connections also set a practical starting limit. They are useful 2.5GbE ports, but reaching Synology's highest published sequential figure requires compatible faster networking, an add-in card and the rest of the network to match.

Finally, the standard warranty is three years rather than five. EW201 can extend coverage, but an extended warranty does not protect the only copy of a file. Important data still needs a separate recovery path if the enclosure, several drives or the site itself becomes unavailable.

## Australian Buyers: What You Need to Know

The Synology DS1825+ has a market price of about $1,999. Check the retailer before you buy, as prices move. It is stocked by major Australian computer retailers, and the complete storage budget should be worked out by adding the current NAS and drive prices before comparing the resulting usable capacity.

The standard hardware warranty is three years, and Synology's EW201 extension to five years is offered in Oceania. Ask the seller how a fault is handled before purchase, particularly when the NAS will support business operations, and see the [Australian NAS warranty and returns guide](https://needtoknowit.com.au/blog/nas-warranty-and-returns-australia/) for who to contact.

Your first step for a faulty product is usually the retailer that sold it. The ACCC explains your rights under the Australian Consumer Law at [accc.gov.au](https://www.accc.gov.au/consumers/consumer-rights-guarantees).

For remote access, the two 2.5GbE ports are far faster than any home or small-office NBN upload, so the internet plan's upload speed becomes the limit rather than the NAS. CGNAT (Carrier-Grade Network Address Translation) lets an internet provider place several customers behind one public address and can block direct inbound connections, like an apartment building with one street address but no route to a particular unit. QuickConnect can relay connections around that obstacle, while the [Australian remote-access guide](https://needtoknowit.com.au/blog/nas-remote-access-vpn-australia/) covers safer access choices.

Synology rates the DS1825+ for an ambient operating temperature of 0 to 40°C. Keep it inside that range when placing it in a hot room, cupboard or garage, and consult the [NAS noise and placement guide](https://needtoknowit.com.au/blog/nas-noise-placement-guide/) before choosing an enclosed location.

Synology's power figures are 60.1 watts during access and 18.34 watts in HDD hibernation under its test conditions. Estimate local running cost using watts multiplied by operating hours and the electricity rate from the bill, with the [NAS power calculator](https://needtoknowit.com.au/tools/power-calculator/) handling the arithmetic.

## Verdict

The DS1825+ earns its place on a shortlist when eight bays support a real growth, backup or surveillance plan and when ECC memory, DSM's backup tools or future network upgrades will be used. It is particularly well matched to a small business file server, a substantial camera deployment or a large archive whose owner wants room to expand without immediately replacing the enclosure.

The Synology DS1825+ has a market price of about $1,999. At that level, the decision should be based on the complete workload rather than the appeal of spare bays: current storage, expected growth, protection, backup destinations, network speed and any additional camera licences or compatible M.2 SSDs.

Most households should choose fewer bays, while demanding Plex users should separate media storage from 4K conversion or select hardware that Plex lists for acceleration. For the right workload, the DS1825+ offers a useful combination of eight bays, ECC memory, expandable networking and mature storage software, with strict M.2 rules and limited transcoding stated upfront.

## Frequently Asked Questions

Related reading: our [NAS buyer's guide](/blog/best-nas-australia/), our [Synology brand guide](/blog/synology-nas-australia/), and our [AU retailer guide](/blog/where-to-buy-nas-australia/).

**Q: Can I use third-party hard drives in the DS1825+?**

Yes. On DSM 7.3, the DS1825+ can create storage pools with third-party HDDs and 2.5-inch SATA SSDs that are not on Synology's compatibility list. Synology still recommends listed drives for validated performance and reliability, while drives on its incompatibility list are unsupported. Check the current model-specific list before buying because M.2 SSD rules are stricter.

**Q: Can the DS1825+ do Plex hardware transcoding?**

Plex lists no hardware-accelerated transcoding support for the DS1825+. Its compatibility sheet indicates software transcoding for SD and 720p, some 1080p capability and no 4K software transcoding. It is therefore best used for direct play, where the client plays the original file, rather than converting 4K video on demand.

**Q: Is ECC memory worth having in the DS1825+?**

ECC memory is worthwhile when the NAS holds business data, runs continuous backup jobs or supports services where memory errors could affect reliability. It detects and corrects single-bit errors before they propagate, like proofreading a character before saving the page. A basic home archive may receive less practical benefit, but the DS1825+ includes 8 GB of ECC memory as standard.

**Q: Can the DS1825+ be upgraded to 10GbE?**

Yes. Its PCIe Gen3 x8 slot, operating with an x4 link, can accept supported Synology-compatible 10GbE RJ-45 or 10/25GbE SFP+/SFP28 network cards. Check the compatibility list for the exact card. The switch, client network adapter, cabling and storage configuration must also support the intended speed.

**Q: How many cameras can the DS1825+ record?**

Surveillance Station includes two camera licences, and connecting more cameras or devices requires additional licences. Synology lists up to 32 channels of 4K H.264 video at 320 frames per second in total. That is a vendor maximum, so size the deployment around each camera's bitrate, recording schedule, retention period and the other work the NAS performs.

**Q: DS1825+ or DS1825neo+?**

Choose between them according to memory requirements rather than drive bays or networking. Both use the same processor, eight-bay chassis, built-in network ports and PCIe slot, but the DS1825+ includes 8 GB of ECC memory while the DS1825neo+ starts with 4 GB of non-ECC memory. Both carry a three-year standard hardware warranty.

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