Expansion Unit DX1215II
Plug-and-play storage expansion for Synology DiskStation
Overview:
Easily add 12 bays to your DiskStation
With its 12-bay desktop form factor, the DX1215II provides generous storage expansion for Synology DiskStation1 whenever needed with minimal impact on the deployment footprint.
- Seamless Storage Expansion
Add 12 additional drive bays to your Synology DiskStation - Best Fit With Synology Enterprise HDD
Use with Synology HAT5300 SATA HDDs for high performance and verified compatibility - Easy Hardware Setup
Plug-and-play design makes upgrading storage easy - Extended After-Sales Support
Backed by Synology’s 5-year limited warranty
Features:
Online volume and storage expansion
Add a new volume to your storage, or seamlessly expand RAID volumes on Synology DiskStation without reformatting drives with online volume expansion through DiskStation Manager (DSM) to minimize service disruptions.


Simple setup and management
Plug-and-play design makes adding the DX1215II to an existing DiskStation simple. Unified drive management through DSM ensures health monitoring, storage allocation, and maintenance tasks are centralized and easily accessible to administrators.
Compact Storage for Easy Expansion
It is easy to expand your Synology DiskStation1 with 12 additional 3.5 inch drive bays with the DX1215II expansion unit. The plug-and-play design adds drives to the host DiskStation without additional setup or downtime.
Technical Specifications:
Hardware Specifications: | |
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Applied Models |
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Storage | |
Drive Bay(s) | 12 |
Compatible Drive Type |
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Hot Swappable Drive | |
RAID Management through Synology DSM | |
External Ports | |
Expansion Port | 1 |
Appearance | |
Size (Height X Width X Depth) | 270 mm x 300 mm x 340 mm |
Weight | 9.02 kg |
Power | |
Power Recovery | Synchronized with the Synology DiskStation |
Power Supply Unit / Adapter | 550W |
AC Input Power Voltage | 100V to 240V AC |
Power Frequency | 50/60 Hz, Single Phase |
Power Consumption* |
51.23 W (Access) 21.71 W (HDD Hibernation) |
British Thermal Unit |
174.69 BTU/hr (Access) 74.03 BTU/hr (HDD Hibernation) |
Note | Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s). |
Temperature | |
Operating Temperature | 5°C to 40°C (40°F to 104°F) |
Storage Temperature | -10°C to 70°C (-15°F to 155°F) |
Relative Humidity | 5% to 95% RH |
Others | |
System Fan | 120 mm x 120 mm x 2 pcs |
Easy Replacement System Fan | |
Noise Level | 27.2 dB(A) |
Note | Noise Level Testing Environment: Fully loaded with Seagate 1TB ST31000520AS hard drive(s) in idle; Two G.R.A.S. Type 40AE microphones, each set up at 1 meter away from the Synology NAS front and rear; Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8% | Certification |
|
Warranty | 5 Years |
Environment & Packaging | |
Environment | RoHS Compliant |
Packaging Content |
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Optional Accessories |
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*Model specifications are subject to change without notice. Please refer to www.synology.com for the latest information.
Documentation:
Download the Synology Expansion Unit DX1215II Datasheet (PDF).

5-year warranty
At Synology, we are committed to product innovation and quality. Synology guarantees a robust and reliable data management experience with a 5-year limited warranty, providing responsive technical support and hardware replacement services to maximize your return on investment.
- All Prices are Inclusive of GST
- Pricing and product availability subject to change without notice.