Expansion Unit DX517
Compatibility Downloads
Compatibility Downloads
Sign up for Synology newsletters

Expansion Unit DX517

Effortless capacity expansion for Synology DiskStation solutions on-the-fly.

DX517
DX517

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
img enterprise-hat img plus-hat3310 img enterprise-sat

Notes:

  1. View specifications for a list of supported models.

  2. 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+
  • 18 series:DS1618+, DS918+, DS718+, NVR1218
  • 17 series:DS1817+, DS1817, DS1517+
  • 15 series:DS1815+, DS1515+
Supports creating volumes on a single unit only DS218+
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 EW201 or 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

Notes:

  1. Model specifications are subject to change without prior notice.
  2. 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.
  3. The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations.
  4. If usage requirements exceed the specifications above, please contact our regional partners for professional advice.