Find an M.2 Drive Your Synology Will Accept
The only M.2 drives a 2025 Plus model will use for cache or a storage pool
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Synology's compatibility list for the M.2 slots of its 2025 Plus models contains 7 drives, all from its own SNV3400, SNV3410 and SNV5420 series. On those models an M.2 drive that is not on the list cannot create an SSD cache or a storage pool, so this is the complete shopping list. The table shows the ones in stock on Amazon.com today; the reference table underneath lists all 7 by endurance, which is what matters for a cache that is written constantly.
Every drive on the list, by endurance
| Drive | Capacity | Endurance (TB written) | Interface | Power-loss protection |
|---|---|---|---|---|
| Synology SNV5420-1600G | 1.6TB | more than 2,900 TB | NVMe PCIe 3.0 x4 | Yes |
| Synology SNV5420-800G | 800GB | more than 1,400 TB | NVMe PCIe 3.0 x4 | Yes |
| Synology SNV3410-800G | 800GB | 1,022 TB | NVMe PCIe 3.0 x4 | Not stated |
| Synology SNV5420-400G | 400GB | more than 700 TB | NVMe PCIe 3.0 x4 | Yes |
| Synology SNV3410-400G | 400GB | 491 TB | NVMe PCIe 3.0 x4 | Not stated |
| Synology SNV3400-800G | 800GB | Not published in a readable sheet | NVMe PCIe 3.0 x4 | Not stated |
| Synology SNV3400-400G | 400GB | Not published in a readable sheet | NVMe PCIe 3.0 x4 | Not stated |
Where the list comes from
The list was read on October 12, 2026 from Synology's compatibility pages for the DS425+, DS725+, DS925+, DS1525+ and DS1825+, and it is identical on each. No third-party M.2 drive appears on any of them. Endurance, interface and power-loss protection are from Synology's specification sheets for each drive.
The same seven drives are the list for the pre-2025 DS923+ and DS423+. On those two older models an unlisted drive is shown as Unverified, and the 2025 block does not apply to them.
Checked on October 12, 2026. Sources: Synology Products Compatibility List: DS925+, M.2 SSD via internal slot; Synology Knowledge Center: Drive compatibility policies for systems from 2025 (DSM 7.3 and above); Synology Knowledge Center: models that support M.2 SSD storage pools; Synology SNV5420 product specifications (400G, 800G and 1600G sheets); Synology SNV3410 / SNV3510 datasheet.
Which one to buy
Pick by endurance. A cache is written far more often than ordinary storage, and endurance is the figure Synology publishes that speaks to that. The SNV5420 series has the highest endurance on the list and is the series whose specification sheets state power-loss protection.
Capacity matters less than people expect: a cache only needs to hold the data you touch often, which is why the list tops out at 1.6TB.
Why a faster consumer drive is not an option
Every drive on the list is a PCIe 3.0 drive, so none of them is fast by current standards. That is not the point of the list. Synology's stated reason for restricting M.2 is endurance under caching workloads, and a 2025 Plus model will refuse to build a cache or a pool on a drive that is not listed, whatever its speed.
Synology-validated M.2 NVMe drives in stock on Amazon.com
Synology SNV3400, SNV3410 and SNV5420 drives only. Ordered by price, not by price per terabyte: these are small, high-endurance cache drives.
| Product | Capacity | Price | $ / TB | Type | Prime | Buy |
|---|---|---|---|---|---|---|
| Synology SNV5420-400G M.2 NVMe SSD 400G | 400 GB | $587.03 | $1,467.57 | M.2 NVMe | - | Buy on Amazon |
Frequently asked questions
Which M.2 NVMe drives work in a Synology DS925+?
For cache or a storage pool: the 7 Synology SNV3400, SNV3410 and SNV5420 drives on its compatibility list. No third-party M.2 drive is on the list.
Can I use a Samsung 990 Pro or WD Red SN700 in a 2025 Synology?
Not for a new cache or storage pool. A 2025 model accepts an unlisted M.2 drive only when it is migrated, still in use, from another Synology system.
Which Synology M.2 drive has the highest endurance?
The SNV5420-1600G, at more than 2,900 TB written according to Synology's specification sheet.
Can these drives be a storage pool and not only a cache?
On the models Synology lists as supporting M.2 storage pools, yes. Synology keeps that model list in its Knowledge Center, and the 2025 Plus models with M.2 slots are on it.
Why does this page sometimes show few drives in stock?
Because the list is short and these are low-volume parts. When fewer than three are in stock the page stays available for reference and is left out of search indexing until stock returns.