Check What Fits the DS725+
DS725+: 2 SATA bays, 2 M.2 slots. ECC memory up to 32GB
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The DS725+ takes two 3.5-inch or 2.5-inch SATA drives and two M.2 2280 NVMe drives, with ECC DDR4 memory to a limit of 32GB; one DX525 expansion unit takes it to 7 bays. Synology's list for it names 22 hard drives, 19 SATA SSDs and 7 M.2 drives, every one a Synology part.
What two bays hold on the DS725+
| Drive size | Raw (2 drives) | Usable, one drive of protection |
|---|---|---|
| 8TB | 16TB | 8TB |
| 12TB | 24TB | 12TB |
| 16TB | 32TB | 16TB |
| 20TB | 40TB | 20TB |
| 24TB | 48TB | 24TB |
What fits the DS725+, slot by slot
| Part | DS725+ has | On Synology's list | If not on the list |
|---|---|---|---|
| 3.5-inch SATA hard drive | 2 bays | 22 Synology HAT drives, up to 24TB | Supported for pools |
| 2.5-inch SATA SSD | Same 2 bays | 19 Synology SAT drives | Supported for pools and cache |
| M.2 NVMe SSD | 2 x M.2 2280, not hot swappable | 7 Synology SNV drives | No new cache or pool |
| Memory module | 2 slots, DDR4 ECC SO-DIMM, 32 GB (16 GB × 2) | D4ES04-4G, D4ES03-8G, D4ES03-16G | Not validated by Synology |
| Expansion unit | 7 (DX525 × 1) over USB Type-C | DX525 | Not applicable |
Expansion and ports on the DS725+
The DS725+ has a USB Type-C expansion port for the DX525: one DX525 expansion unit takes it to 7 bays. RAID 5, RAID 6, RAID 10 become available once the unit is attached. Its network ports are 1 x 2.5GbE + 1 x 1GbE. It lists no PCIe or network upgrade slot, so 2.5GbE is its ceiling.
DS725+ specifications, as Synology publishes them
| DS725+ | |
|---|---|
| Processor | AMD Ryzen R1600, 2 cores / 4 threads |
| Processor speed | 2.6 (base) / 3.1 (turbo) GHz |
| Memory fitted | 4 GB DDR4 ECC SODIMM |
| Memory slots and limit | 2 slots, 32 GB (16 GB × 2) |
| Memory modules Synology lists | D4ES04-4G, D4ES03-8G, D4ES03-16G |
| Drive bays | 2 x 3.5-inch or 2.5-inch SATA |
| M.2 slots | 2 x M.2 2280 NVMe |
| Most bays with expansion | 7 (DX525 × 1) |
| Network ports | 1 x 2.5GbE + 1 x 1GbE |
| PCIe or network upgrade slot | None listed |
| RAID types | SHR, Basic, JBOD, RAID 0, RAID 1, RAID 5 (with expansion unit), RAID 6 (with expansion unit), RAID 10 (with expansion unit) |
| Largest single volume | 200TB with 32GB of memory, otherwise 108TB |
| Power draw (Synology's test) | 20.41W in use, 7.87W with drives hibernating |
| Noise (Synology's test) | 17.9 dB(A) |
| Power adapter | 65W |
| Size and weight | 166 mm × 106 mm × 223 mm, 1.51 kg |
| Hardware warranty | 3 years |
Where the DS725+ figures come from
Read from Synology's DS725+ product page and compatibility list on October 12, 2026. Capacities are bays times drive size in decimal terabytes.
Checked on October 12, 2026. Sources: Synology DS725+ technical specifications; Synology compatibility list for the DS725+; Synology Knowledge Center: Drive compatibility policies for systems from 2025 (DSM 7.3 and above).
Go deeper
Only DS725+ specifics are on this page.
RAM for the DS725+ · Synology-validated M.2 NVMe drives · NAS drive basics: CMR, NAS-rated drives and SHR · Synology DSM 7.3 third-party drive policy
The DS725+ on Amazon.com today
New listings of the DS725+ itself, including bundles sold with drives fitted, which are labelled.
| Product | Capacity | Price | $ / TB | Type | Prime | Buy |
|---|---|---|---|---|---|---|
| Synology DS725+ Expandable NAS Storage - Private Cloud for Home and Small Business (2-Bay Diskless NAS)Sold by Amazon | Diskless | $527.99 | - | NAS device · network | Prime | Buy on Amazon |
| Synology DS725+ 2-Bay Diskstation NAS (Ryzen R1600, 4GB Ram), 1x 2.5GbE, 1x 1GbE, 2X M.2 NVMe Steckplätze 8TB Bundle with 2X 4TB Seagate Ironwolf | 8 TB included (2 x 4 TB) | $1,315.22 | - | NAS + drives bundle | - | Buy on Amazon |
Hard drives on Synology's DS725+ 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 DS725+, 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 DS725+ 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 does the DS725+ take?
DDR4 ECC SO-DIMM, 4GB fitted, two slots, to a limit of 32 GB (16 GB × 2). Synology lists the D4ES04-4G, D4ES03-8G, D4ES03-16G.
Can the DS725+ be expanded?
Yes: one DX525 expansion unit takes it to 7 bays, connected over USB Type-C.
What network ports does the DS725+ have?
1 x 2.5GbE + 1 x 1GbE.