5-bay 3.5"/2.5" SATA expansion

Easily add 5 additional drive bays to Synology DiskStation. Supporting both 2.5" and 3.5" SATA drives, DX517 is a flexible solution supporting on-the-fly volume expansion or serving as a local backup destination.

Online volume expansion

Managed from DiskStation Manager on the host NAS, the additional bays in the DX517 are immediately ready to be used once connected. On-the-fly volume expansion ensures that storage and services on the host are not interrupted during volume expansion.

Hot-swappable drive tray design

The hot-swappable drive trays of DX517 allow easy drive installation and replacement without powering down the system. Screwless drive tray design reduces the time needed for system setup.

Dedicated local backup solution

Synology DX517 can be used as a dedicated local backup solution for the Synology DiskStation. When created as a separate volume, the DX517 provides a great backup solution to its local hard disks in case of system failure.

Backed by Synology drives

Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.

Enterprise Series 3.5" SATA Plus Series 3.5" SATA

Enterprise Series 2.5" SATA

Notes:

View specifications for a list of supported models.
Storage drives are sold separately. Refer to the compatibility list for compatible devices.

Hardware Specifications
Applied Models
Applied Models	Supports creating volumes across different units	23 series:DS1823xs+, DS923+, DS723+ 22 series:DS1522+ 21 series:DS1821+, DS1621xs+, DS1621+, DVA3221 20 series:DS1520+, DS920+, DS720+ 19 series:DS1819+, DS1019+, DVA3219 18 series:DS1618+, DS918+, DS718+, NVR1218 17 series:DS1817+, DS1817, DS1517+, DS1517 16 series:DS916+, DS716+II, DS716+ 15 series:DS1815+, DS1515+, DS1515
	Supports creating volumes on a single unit only	18 series:DS218+ 16 series:DS216+II, DS216+, NVR216 15 series:DS415+
	Notes	For more information on the compatibility of each expansion unit, please refer to this article. Please upgrade to DSM 6.2.1-23824-5 or later version before using it with 15 and 16 series models (excluding DS1515, DS716+, and DS716+II). To have better performance, we recommend creating storage volumes physically located within the same NAS or Expansion Unit, rather than creating volumes across your NAS and Expansion Unit.
Storage
Storage	Drive Bays	5
	Compatible Drive Type* (See all supported drives)	3.5" SATA HDD 2.5" SATA HDD 2.5" SATA SSD
	Hot Swappable Drive*
	RAID Management through Synology DSM
	Notes	Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
External Ports
External Ports	eSATA Port	1
Appearance
Appearance	Size (Height x Width x Depth)	157 mm x 248 mm x 233 mm
	Weight	3.91 kg
Power
Power	Power Recovery	Synchronized with the Synology DiskStation
	Power Supply Unit / Adapter	200 W
	AC Input Power Voltage	100V to 240V AC
	Power Frequency	50/60 Hz, Single Phase
	Power Consumption	29.9 W (Access) 2.4 W (HDD Hibernation)
	British Thermal Unit	102.02 BTU/hr (Access) 8.19 BTU/hr (HDD Hibernation)
	Notes	Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
Temperature
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
Others	System Fan	80 mm x 80 mm x 2 pcs
	Easy Replacement System Fan
	Noise Level*	21.5 dB(A)
	Notes	Noise Level Testing Environment: Fully loaded with Seagate 1TB ST31000520AS hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Certification
Certification	FCC CE BSMI
Warranty
Warranty	3-year hardware warranty, extendable to 5 years with Extended Warranty Plus
	Notes	Availability varies by region. Before purchasing, please visit the official web pages of EW201/202 and Extended Warranty Plus for a list of eligible regions. The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment & Packaging
Environment
Environment	RoHS Compliant
Packaging Content
Packaging Content	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 Expansion Cable: eSATA X 1 Quick Installation Guide X 1
Optional Accessories
Optional Accessories	3.5" SATA HDD: HAT5300/HAT3300 Enterprise Series 2.5" SATA SSD: SAT5200 Series

Notes:

Model specifications are subject to change without prior notice.
The figures are based on Synology internal testing. Each performance test is done individually. No other services or applications are processed at the same time.
The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations.
If usage requirements exceed the specifications above, please contact our regional partners for professional advice.