Synology DX525 5-Bay Expansion Unit for DiskStation
PRODUCT DESCRIPTION
Synology DX525 5-Bay Expansion Unit DX525 - 3 Years Warranty
Add Five Bays
The DX525 adds five hot-swappable drive bays to a compatible 25-series Synology DiskStation, so capacity grows without migrating to a new NAS.
Simple USB Type-C Link
Connects to the host DiskStation with the supplied USB Type-C expansion cable and is managed from DSM.
Built for 25-Series Plus and neo+
Works with the DS725+, DS925+, DS1525+, DS1825+ and their neo+ counterparts.
Synology DX525 Datasheet — Technical Specifications
General
| Product Name | Synology Expansion Unit DX525 |
| Model | DX525 |
| Form Factor | 5-bay desktop expansion unit |
| UPC | 846504005291 |
| Warranty | 3 years (Synology), extendable to 5 years with EW201 |
Storage & Connection
| Drive Bays | 5 x 3.5" SATA HDD or 2.5" SATA SSD |
| Hot-Swap | Yes |
| Host Connection | USB Type-C expansion cable (included) |
Power & Physical
| Power Adapter | 90 W, 100–240 V AC |
| Power Consumption | 35.37 W (access), 7.0 W (HDD hibernation) |
| Fans | 2 x 92 mm |
| Noise Level | 20.4 dB(A) |
| Operating Temperature | 0–40 °C |
| Storage Temperature | -20–60 °C |
| Operating Humidity | 8–80% RH |
| Dimensions (H x W x D) | 166 x 230 x 223 mm |
| Weight | 2.46 kg |
Compatibility & Applications
Compatible Hosts
DS725+, DS725neo+, DS925+, DS925neo+ (one DX525 each), DS1525+, DS1525neo+, DS1825+, DS1825neo+ (up to two DX525).
Typical Use
Growing an existing volume or adding a separate storage pool for backup, media or surveillance archives.
Drives
Use Synology Plus / Enterprise HDDs and check Synology's compatibility list for the host model.
Package Contents & Synology Ordering Information
In the Box
1 x DX525 main unit, 1 x USB Type-C expansion cable, 1 x accessory pack, 1 x AC power adapter, 1 x AC power cord. Drives not included.
Synology NAS Models at SourceIT
| Model | Key feature |
| DS223j | 2-bay, Realtek RTD1619B, 1 GB, 1 x 1GbE — entry personal cloud |
| DS223 | 2-bay, Realtek RTD1619B, 2 GB, 1 x 1GbE, 3 x USB, hot-swap bays |
| DS225+ | 2-bay Plus, Intel Celeron J4125, 2 GB, 1GbE + 2.5GbE |
| DS725neo+ | 2-bay neo+ (7 with DX525), AMD Ryzen R1600, 4 GB non-ECC, 1GbE + 2.5GbE, 2 x M.2 |
| DS725+ | 2-bay Plus (7 with DX525), AMD Ryzen R1600, 4 GB ECC, 1GbE + 2.5GbE, 2 x M.2 |
| DS425+ | 4-bay Plus, Intel Celeron J4125, 2 GB, 1GbE + 2.5GbE, 2 x M.2 |
| DS925neo+ | 4-bay neo+ (9 with DX525), AMD Ryzen V1500B, 4 GB non-ECC, 2 x 2.5GbE, 2 x M.2 |
| DS925+ | 4-bay Plus (9 with DX525), AMD Ryzen V1500B, 4 GB ECC, 2 x 2.5GbE, 2 x M.2 |
| DS1525neo+ | 5-bay neo+ (15 with 2 x DX525), AMD Ryzen V1500B, 4 GB non-ECC, 2 x 2.5GbE, 10GbE upgrade slot |
| DS1525+ | 5-bay Plus (15 with 2 x DX525), AMD Ryzen V1500B, 8 GB ECC, 2 x 2.5GbE, 10GbE upgrade slot |
| DS1825neo+ | 8-bay neo+ (18 with 2 x DX525), AMD Ryzen V1500B, 4 GB non-ECC, 2 x 2.5GbE, PCIe slot |
| DS1825+ | 8-bay Plus (18 with 2 x DX525), AMD Ryzen V1500B, 8 GB ECC, 2 x 2.5GbE, PCIe slot |
| RS822RP+ | 1U 4-bay rackmount (8 with RX418), AMD Ryzen V1500B, 2 GB ECC, 4 x 1GbE, redundant PSU |
| DX525 (this listing) | 5-bay expansion unit for 25-series Plus and neo+ DiskStations (USB Type-C) |
Official Synology Videos
Introducing DiskStation Manager 7.3 (official Synology channel)
Datasheet & Downloads
| Datasheet | DX525 Datasheet (PDF) |
| Specifications | DX525 specifications on synology.com |
| Drive compatibility | Synology compatibility list |
Frequently Asked Questions — Synology DX525
Which NAS models support it?
The 25-series DS725+, DS925+, DS1525+, DS1825+ and their neo+ versions.
How many can I connect?
One on the DS725+/DS925+ (and neo+), up to two on the DS1525+/DS1825+ (and neo+).
Are hard drives included?
No. The DX525 is diskless.
Do I get a GST invoice?
Yes. Supplied by SourceIT in Singapore with a GST invoice.
