The DS1825+ is in Synology's DS Plus and desktop models of FS series policy table. On it, an unlisted hard drive is supported for new installation and storage pool creation and migration from an existing Synology system; an unlisted 2.5" SATA SSD is supported for new installation and storage pool creation, cache creation and migration from an existing Synology system; and an unlisted M.2 NVMe SSD is supported for migration from an existing Synology system only. A drive on Synology's incompatibility list is not supported at all. Source: Synology, DSM 7.3, last updated 27 May 2026.
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With eight drive bays the DS1825+ is the largest 2025 DiskStation, which makes it the model where the cost of choosing listed drives over unlisted ones multiplies furthest.
Synology's article states: “The table below summarizes drive compatibility by product series and drive type for models released in 2025 and later:” This is the DS Plus and desktop models of FS series table, transcribed from its merged cells. "Not Listed" is the column you are in with almost any drive bought on price.
| Drive type | On compatibility list | Not listed | On incompatibility list |
|---|---|---|---|
| HDD | Supported for new installation and storage pool creation and migration from an existing Synology system | Supported for new installation and storage pool creation and migration from an existing Synology system | Not supported |
| 2.5" SATA SSD | Supported for new installation and storage pool creation, cache creation and migration from an existing Synology system | Supported for new installation and storage pool creation, cache creation and migration from an existing Synology system | Not supported |
| M.2 NVMe SSD | Supported for new installation and storage pool creation, cache creation and migration from an existing Synology system | Supported for migration from an existing Synology system | Not supported |
A drive on Synology's incompatibility list is not supported for a new installation or storage pool, for cache, or for migration - on every series. The incompatibility list is not the same thing as being absent from the compatibility list. A drive on it is one Synology has tested and found incompatible; Synology's Storage Manager article defines that status as “This drive is tested to be incompatible with your Synology storage system.” A drive that is merely missing from the compatibility list is "Unverified" instead - “This drive has not been verified as compatible with your Synology storage system.” - and Synology says that for such a drive its technical support “may only provide limited assistance.”
Because an unlisted hard drive is supported for a new pool on the DS1825+, this is the cheapest per terabyte of the third-party 3.5-inch SATA hard drives we track in stock - the 8 cheapest, one row per drive. Each will show as Unverified in Storage Manager. A drive that fits is not a drive Synology has tested; for a NAS, prefer CMR (the fill lists filter for it).
| Drive | Capacity | $/TB | Price | Condition | |
|---|---|---|---|---|---|
| WD Ultrastar 10TB SATA HUH721010ALE600 | 10TB | $20.00 | $200.00 | Refurbished / used This offer: sold by AceTech Solutions LLC · Amazon says Used / Good · AceTech Solutions LLC's note: Works fine, may have cosmetic wear such as scuffs, marks, scratches, dents, etc. Drive tested by special programs to make sure it works and is a healthy drive. Due to having more than one drive, drive might have a different serial numbers, date, FW, etc. So if your looking for something specific just let us know first. Other drives in stock has similar overview / s.m.a.r.t. and usage to the one listed. Please refer to pictures for details, you will get item as is. | Buy on Amazon → |
| WD Ultrastar 14TB SATA WUH721414ALE604 | 14TB | $24.29 | $339.99 | Refurbished / used This offer: sold by Worldwide Product Importer · Amazon says New / New · title says Renewed | Buy on Amazon → |
| Toshiba MG07ACA14TE 14TB SATA Enterprise | 14TB | $24.93 | $349.00 | Refurbished / used This offer: sold by ServerPartDeals · Amazon says New / New · title says Renewed | Buy on Amazon → |
| Seagate IronWolf Pro 12TB NAS ST12000NE0008 | 12TB | $25.44 | $305.27 | Refurbished / used This offer: sold by ALL4COMPUTERS ----- SIGNATURE REQUIRED ----- · Amazon says Used / Good · ALL4COMPUTERS ----- SIGNATURE REQUIRED -----'s note: 5 YEAR DEALER WARRANTY - 100% SATISFACTION GUARANTEED. | Buy on Amazon → |
| MDD 14TB SATA 6G 7200RPM 256MB Enterprise | 14TB | $25.71 | $359.99 | Refurbished / used This offer: sold by DBSKY · Amazon says New / New · title says Renewed | Buy on Amazon → |
| WD Ultrastar 14TB SATA WUH721414ALE604 | 14TB | $25.71 | $359.99 | Refurbished / used This offer: sold by Worldwide Product Importer · Amazon says New / New · title says Renewed | Buy on Amazon → |
| Seagate BarraCuda 3TB ST3000DM001 | 3TB | $26.13 | $78.39 | Refurbished / used This offer: sold by Multi-Com Computers (All Serial Numbers Recorded) · Amazon says Used / LikeNew | Buy on Amazon → |
| WD Purple 4TB WD40PURX | 4TB | $26.25 | $105.00 | Refurbished / used This offer: sold by Multi-Com Computers (All Serial Numbers Recorded) · Amazon says Used / LikeNew | Buy on Amazon → |
2.5-inch SATA SSDs: an unlisted 2.5" SATA SSD can build a pool on the DS1825+, but we track no 2.5-inch SATA SSD in stock right now, so there is nothing to list.
M.2 NVMe: an unlisted M.2 NVMe SSD is supported for migration from an existing Synology system only on this model, so we list no M.2 drives for it - for a cache or an M.2 pool, the drive needs to be on Synology's list for the DS1825+.
The full Synology drive policy, every series · Synology's list for the DS1825+, measured · Same table: DS925+, DS425+, DS225+, DS725+, DS1525+
Which models this cluster covers: those on Synology's product list (50 products, read 2026-10-05) with a 2025-or-later launch announcement in Synology's newsroom (read 2026-10-05). We do not infer a launch year from a model number.
Yes. The DS1825+ is in Synology's DS Plus and desktop models of FS series table, where an unlisted hard drive is supported for a new installation, a new storage pool and migration. Storage Manager shows such a drive as Unverified - in Synology's words, it "This drive has not been verified as compatible with your Synology storage system". Source: Synology, DSM 7.3, last updated 27 May 2026.
For a new pool or a cache, no: an unlisted M.2 NVMe SSD is supported for migration from an existing Synology system only - migration from an existing Synology system. Synology's reason: "To ensure system reliability, only M.2 NVMe SSDs meeting strict performance, endurance, and thermal management requirements are supported for creating storage pools and caches." Source: Synology, DSM 7.3, last updated 27 May 2026.
A drive on Synology's incompatibility list is not supported for a new installation or storage pool, for cache, or for migration - on every series. That is a separate list from the compatibility list: a drive on it is one Synology has tested and found incompatible, which Storage Manager reports as "Incompatible". A drive simply missing from the compatibility list is "Not Listed", the middle column of the table on this page.
Synology announced it on July 8, 2025 ("Synology® Introduces DiskStation® DS1825+ & DS725+"). It matters because Synology states: "The new drive compatibility policies apply only to new models starting in 2025 and do not apply retroactively to previously launched systems." A model launched before 2025 is outside these tables altogether.
Synology's article is written for "DSM 7.3 and above" and gives no build number and no date for the change, so we print neither. Its last-updated stamp is 2026-05-27; we last read it on 2026-10-05.