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With its 12-bay desktop form factor, the DX1215II provides generous storage expansion for Synology DiskStation whenever needed with minimal impact on the deployment footprint.
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.
Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.
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.
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.
View specifications for a list of supported models. Requires DSM 6.2.4-25556 or newer to be installed on the host device.
Storage drives are sold separately. Refer to the for compatible devices.
The warranty period starts from the date of purchase as stated on your purchase receipt. Visit https://www.synology.com/company/legal/warranty for more information.
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Hardware Specifications
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Applied Models
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Applied Models
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Supports creating volumes across different units |
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| Notes |
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Storage
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Storage
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Drive Bays | 12 |
| Compatible Drive Type* |
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| Hot Swappable Drive* | ||
| RAID Management through Synology DSM | ||
| Notes | Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the . The use of non-validated components may limit certain functionality and result in data loss and system instability. | |
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External Ports
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External Ports
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Expansion Port | 1 |
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Appearance
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Appearance
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Size (Height x Width x Depth) | 270 mm x 300 mm x 340 mm |
| Weight | 9.02 kg | |
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Power
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Power
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Power Recovery | Synchronized with the Synology DiskStation |
| Power Supply Unit / Adapter | 550 W | |
| 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) |
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| British Thermal Unit |
174.69 BTU/hr (Access)
74.03 BTU/hr (HDD Hibernation) |
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| Notes | Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s). | |
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Temperature
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Temperature
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Operating Temperature | 5°C to 35°C (40°F to 95°F) |
| Storage Temperature | -20°C to 60°C (-5°F to 140°F) | |
| Relative Humidity | 5% to 95% RH | |
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Others
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Others
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System Fan | 120 mm x 120 mm x 2 pcs |
| Easy Replacement System Fan | ||
| Noise Level* | 27.2 dB(A) | |
| Notes | Noise Level Testing Environment: Fully loaded with Seagate ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology expansion unit at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%. | |
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Certification
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Certification
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Warranty
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Warranty
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5 Years | |
| Notes | The warranty period starts from the purchase date as stated on your purchase receipt. | |
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Environment & Packaging
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Environment
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Environment
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RoHS Compliant | |
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Packaging Content
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Packaging Content
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