Check What Fits the DS225+ and DS425+
DS225+: 2 SATA bays, no M.2. DS425+: 4 SATA bays, 2 M.2 slots. Non-ECC memory up to 6GB
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The DS225+ takes two 3.5-inch or 2.5-inch SATA drives and has no M.2 slots, with non-ECC DDR4 memory to a limit of 6GB; it cannot be expanded. The DS425+ takes four 3.5-inch or 2.5-inch SATA drives and two M.2 2280 NVMe drives, with non-ECC DDR4 memory to a limit of 6GB; it cannot be expanded. Synology's list for both names 22 hard drives, 19 SATA SSDs and 7 M.2 drives, every one a Synology part.
What fits the DS225+ and DS425+, slot by slot
| Part | DS225+ has | DS425+ has | On Synology's list | If not on the list |
|---|---|---|---|---|
| 3.5-inch SATA hard drive | 2 bays | 4 bays | 22 Synology HAT drives, up to 24TB | Supported for pools |
| 2.5-inch SATA SSD | Same 2 bays | Same 4 bays | 19 Synology SAT drives | Supported for pools and cache |
| M.2 NVMe SSD | No slots | 2 x M.2 2280, not hot swappable | 7 Synology SNV drives | No new cache or pool |
| Memory module | 1 slot, DDR4 non-ECC SO-DIMM, 6 GB (2 GB + 4 GB) | 1 slot, DDR4 non-ECC SO-DIMM, 6 GB (2 GB + 4 GB) | D4NS01-4G | Not validated by Synology |
| Expansion unit | No expansion port | No expansion port | None | Not applicable |
Expansion and ports on the DS225+ and DS425+
Synology lists no expansion unit for the DS225+, so its two bays are fixed. Its network ports are 1 x 2.5GbE + 1 x 1GbE, with no PCIe or network upgrade slot, so 2.5GbE is its ceiling. With no M.2 slots, a cache on the DS225+ would have to use a 2.5-inch SATA SSD in one of those bays.
Synology lists no expansion unit for the DS425+, so its four bays are fixed. Its network ports are 1 x 2.5GbE + 1 x 1GbE, with no PCIe or network upgrade slot, so 2.5GbE is its ceiling.
DS225+ and DS425+ specifications, as Synology publishes them
| DS225+ | DS425+ | |
|---|---|---|
| Processor | Intel Celeron J4125, 4 cores | Intel Celeron J4125, 4 cores |
| Processor speed | 2.0 (base) / 2.7 (turbo) GHz | 2.0 (base) / 2.7 (turbo) GHz |
| Memory fitted | 2 GB DDR4 non-ECC | 2 GB DDR4 non-ECC |
| Memory slots and limit | 1 slot, 6 GB (2 GB + 4 GB) | 1 slot, 6 GB (2 GB + 4 GB) |
| Memory modules Synology lists | D4NS01-4G | D4NS01-4G |
| Drive bays | 2 x 3.5-inch or 2.5-inch SATA | 4 x 3.5-inch or 2.5-inch SATA |
| M.2 slots | None | 2 x M.2 2280 NVMe |
| Most bays with expansion | Not expandable | Not expandable |
| Network ports | 1 x 2.5GbE + 1 x 1GbE | 1 x 2.5GbE + 1 x 1GbE |
| PCIe or network upgrade slot | None listed | None listed |
| RAID types | SHR, Basic, JBOD, RAID 0, RAID 1 | SHR, Basic, JBOD, RAID 0, RAID 10, RAID 1, RAID 5, RAID 6 |
| Largest single volume | 108TB | 108TB |
| Power draw (Synology's test) | 16.98W in use, 6.08W with drives hibernating | 28.25W in use, 6.1W with drives hibernating |
| Noise (Synology's test) | 19.6 dB(A) | 21.6 dB(A) |
| Power adapter | 60W | 90W |
| Size and weight | 165 mm × 108 mm × 232.2 mm, 1.3 kg | 166 mm × 199 mm × 223 mm, 2.18 kg |
| Hardware warranty | 3 years | 3 years |
Where the DS225+ and DS425+ figures come from
Read from Synology's DS225+ and DS425+ product pages and compatibility lists on October 12, 2026. Capacities are bays times drive size in decimal terabytes.
Checked on October 12, 2026. Sources: Synology DS225+ technical specifications; Synology DS425+ technical specifications; Synology compatibility list for the DS225+; Synology compatibility list for the DS425+; Synology Knowledge Center: Drive compatibility policies for systems from 2025 (DSM 7.3 and above).
Go deeper
Only DS225+ and DS425+ specifics are on this page.
RAM for the DS225+ and DS425+ · Synology-validated M.2 NVMe drives · NAS drive basics: CMR, NAS-rated drives and SHR · Synology DSM 7.3 third-party drive policy
The DS225+ on Amazon.com today
New listings of the DS225+ itself, including bundles sold with drives fitted, which are labelled.
The DS425+ on Amazon.com today
New listings of the DS425+ itself, including bundles sold with drives fitted, which are labelled.
| Product | Capacity | Price | $ / TB | Type | Prime | Buy |
|---|---|---|---|---|---|---|
| Synology DS425+ Private Cloud Media Server - Stream, Back Up & Share Files (4-Bay Diskless NAS) | Diskless | $589.00 | - | NAS device · network | - | Buy on Amazon |
Hard drives on Synology's DS225+ and DS425+ list, in stock
| Product | Capacity | Price | $ / TB | Type | Prime | Buy |
|---|---|---|---|---|---|---|
| Synology HAT5300-16T 16 TB Hard Drive - 3.5" Internal - SATA (SATA/600) | 16 TB | $999.99 | $62.50 | NAS HDD · SATACMR | - | Buy on Amazon |
M.2 drives on Synology's list for the DS425+, in stock
| 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
Does the DS225+ have M.2 slots?
No. Synology's specification lists two SATA bays and no M.2 slots.
Does the DS425+ have M.2 slots?
Yes, two, for M.2 2280 NVMe drives. Only the 7 Synology SNV drives on its list can create a cache or a storage pool.
What memory do the DS225+ and DS425+ take?
DDR4 non-ECC SO-DIMM, 2GB fitted, one slot, to a limit of 6 GB (2 GB + 4 GB). Synology lists the D4NS01-4G.
Can the DS225+ and DS425+ be expanded?
No. Synology lists no expansion unit.
What network ports do the DS225+ and DS425+ have?
1 x 2.5GbE + 1 x 1GbE.