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The DS925+ 4-Bay NAS Enclosure from Synology is a capable solution that can adapt to growing storage demands, with support for up to nine drives with an optional expansion unit, two NVMe M.2 2280 slots for SSD caching, two built in 2.5GbE ports. Powered by Synology DiskStation Manager (DSM), it offers a flexible all-in-one solution for data sharing, synchronization, backup, and surveillance. The DS925+ is equipped with four drive bays that are capable of natively supporting 3.5" SATA III hard drives as well as 2.5" SATA III hard drives and SSDs.
The DS925+ runs on Synology DiskStation Manager (DSM) OS, which is a browser-based operating system that helps to simplify managing your Synology NAS. Its CPU is a 2.2 GHz AMD Ryzen V1500B Quad-Core and its 4GB of DDR4 RAM, which can be upgraded to 32GB, allows frequently used files and applications to be quickly accessed. This NAS is capable of sequential read speeds up to 522 MB/s and sequential write speeds up to 565 MB/s.
Also featured are two USB-A 3.2 Gen 1 ports that allow it to be connected to external storage or other USB devices, a USB-C port for the DX525 expansion unit, and network connectivity is achieved via the dual integrated 2.5 Gigabit Ethernet ports that support link aggregation and failover, allowing your stored data to be shared with users throughout the network. For those who require RAID support, the DS925+ supports RAID 0, 1, 5, 6, and 10, as well Synology Hybrid RAID and Basic RAID, each of which offers performance, data redundancy, or a combination of both. For those who do not require a RAID, JBOD is also available, allowing each drive bay to be individually utilized.
The DS925+ is engineered to be energy efficient and its dual 92mm fans to help keep the system running cool at all times. The server supports numerous scheduled power on/off cycles and hard drive hibernation to further minimize power consumption and operation expenses.
The Synology DiskStation DS925+ 4-Bay NAS Enclosure operates on 100-240 VAC at 50/60 Hz and includes an accessory pack, an AC power adapter, an AC power cord, and two RJ45 LAN cables. It is protected by a limited 3-year warranty.
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In October 2025 Synology publicly back tracked on the HDD policy for the 2025 series consumer NAS devices as they were taking a PR beat down.
I purchased a used like new DS925+ w/ extra 30% off coupon the day after they announced the change. I can confirm operation (with no warnings) with random WD and Seagate HDDs I had laying around at the time. However, this did require updating the Diskstation Software to (re)gain native compatibility.
Also, apparently there has been a simple storage DB update script that (re)added support for non-Synology branded drives when the 3rd party HDD policy (compatibility ban) was in effect… but this should have never been required.
Given the early experience with the DS925+, I purchased a DS1525+ and 10GB NIC from B&H around BF. (I needed the extra bandwidth.)
I also purchased two OWC 64GB (32Gb x 2) DDR4 ECC SO-DIMMS kits. All 64GB was detected in each and both systems booted, but neither could consistently pass the build in MemTest. All 4 dimms passed individual memory tests in any of the 4 memory slots but no two pairs (64GB) would pass consistently. We were not able to determine if this was a memtest / Diskstation software limitation or a deeper hardware compatibility issue.
However Synology does not sell a kit over 32GB for these units and does NOT advertise 64GB compatibility. I ended up returning one of the 64GB kits just before the end of the return period. I kept the other and split for a 32gb dimm in each unit. (These kits along with most ECC Ram more than doubled in the ~3 week period while I was troubleshooting… so there was no way i was going to return both kits.)
No other problems so far out of either the DS925+ or the DS1525+.
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