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Synology DX517 5-Bay Expansion Enclosure

BH #SYDX517 • MFR #DX517
53 reviews
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Synology DX517 5-Bay Expansion Enclosure
Key Features
  • For Select Synology DiskStation Models
  • 5 x 3.5"/2.5" SATA Drive Bays
  • 1 x eSATA Port
  • Hot-Swappable & Screwless Design
Built to support on-the-fly volume expansion and local backups, the DX517 5-Bay Expansion Enclosure from Synology adds an additional five 3.5"/2.5" SATA drive bays to select DiskStation solutions. Its drive bays are hot-swappable and screwless, and included is an AC power cord, an accessory pack, and an eSATA expansion cable. Protection is provided by a limited 3-year warranty.
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Synology DX517 External HDD/SSD Overview

Built to support on-the-fly volume expansion and local backups, the DX517 5-Bay Expansion Enclosure from Synology adds an additional five 3.5"/2.5" SATA drive bays to select DiskStation solutions. Its drive bays are hot-swappable and screwless, and included is an AC power cord, an accessory pack, and an eSATA expansion cable. Protection is provided by a limited 3-year warranty.

General Features
5-Bay 3.5"/2.5" SATA Expansion
Add five additional drive bays to your Synology DiskStation DS1817+ and DS1517+. Supporting 2.5" SATA hard drives and SSDs, as well as 3.5" SATA hard drives, the 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 helps ensure 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 drive installation and replacement without powering down the system. A screwless drive tray design also helps reduce the time needed for system setup.
Dedicated Local Backup Solution
Synology's DX517 can be used as a dedicated local backup solution for the Synology DiskStation DS1817+ or DS1517+. When created as a separate volume, the DX517 provides a great backup solution to its local hard disks in case of system failure.
Applied Models (Supports Creating Volumes Across Different Units)
23 Series
DS1823xs+, DS923+, and DS723+
22 Series
DS1522+
21 Series
DS1821+, DS1621xs+, DS1621+, and DVA3221
20 Series
DS1520+, DS920+, and DS720+
19 Series
DS1819+, DS1019+, and DVA3219
18 Series
DS1618+, DS918+, DS718+, and NVR1218
17 Series
DS1817+, DS1817, DS1517+, and DS1517
16 Series
DS916+, DS716+, and DS716+II
15 Series
DS1815+, DS1515+, and DS1515
Applied Models (Supports Creating Volumes On a Single Unit)
18 Series
DS218+
16 Series
DS216+, DS216+II, and NVR216
15 Series
DS415+
UPC: 846504002672

Synology DX517 External HDD/SSD Specs

General
Number of Bays
5x 2.5"/3.5" SATA III
Inputs/Outputs
1x eSATA
Media Card Slots
No
PCI Expansion
No
Electrical
Input Power
100 to 240 VAC, 50 / 60 Hz
Power Consumption
29.9 W (Typical)
2.4 W (Standby)
PSU
1 x 200 W
Physical
Operating Conditions
40 to 104°F / 4 to 40°C at 5 to 95% Humidity
Storage Conditions
14 to 158°F / -10 to 70°C
Certifications
BSMI, CE, FCC, RoHS
Cooling
2x 80 mm Fans
Noise Level
21.5 dBA
Dimensions
9.8 x 9.2 x 6.2" / 248 x 233 x 157 mm
Weight
8.6 lb / 3.9 kg
Packaging Info
Package Weight
12 lb
Box Dimensions (LxWxH)
14.7 x 13.6 x 12.7"

Synology DX517 External HDD/SSD Reviews

Solid product

By Yuxiang
Rated 4 out of 5
Date: 2026-07-26

This is a solid product. It well serve the purpose: extension of existing NAS. The setup is as easy as “plug and play” One suggestion is it will be better to offer an additional longer eSATA cable. I know short cable gives best signal quality. And it works for my setup. But I know some users will appreciate a longer cable for their setup. The 3rd party cable doesn’t have screw head for secured connection. Synology also doesn’t offer longer cable to sell on its website. Therefore an additional longer cable will be very helpful to some users

Great new (older technology) device was exactly what I needed

By John
Rated 5 out of 5
Date: 2026-01-18

Considering how Synology has changed their expansion storage to match their newer products, I needed extra storage for my older Synology NAS. Another of my Synology devices was in the process of failing. B&H had the product at a better price than anyone else and it was new in the box, not used! No shipping either! Thanks for a great price on exactly what I needed.

See any errors on this page?

For a ds920+, with two 4tb and two 12tb drives ...

For a ds920+, with two 4tb and two 12tb drives running out of space with Plex. Would adding this expansion module work?
Asked by: Shaun
Yes, the DX517 5-Bay Expansion Enclosure is a good way to expand the capacity of your DS920+.
Answered by: Alex D
Date published: 2024-05-01

What is in the Accessory Pack that comes in the ...

What is in the Accessory Pack that comes in the box?
Asked by: Denis
Drive keys and mounting screws.
Answered by: Reuben K
Date published: 2019-10-23

Is this enclosure compatible with the 920+?

Is this enclosure compatible with the 920+?
Asked by: Curtis
Yes. Per Synology... Supports creating volumes across different units: 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+, DS716+II 15 series:DS1815+, DS1515+, DS1515 Supports creating volumes on a single unit only: 18 series:DS218+ 16 series:DS216+, DS216+II, NVR216 15 series:DS415+
Answered by: Gregorio M.
Date published: 2023-02-18

What speed does the eSATA port support? Can it do ...

What speed does the eSATA port support? Can it do 600MB/sec (6Gbps)?
Asked by: Terry
600MB/sec is the theoretical maximum supported by the eSATA port specification. In real life, expect about 250 MB/sec max transfer rate between the DX517 and the host NAS. If host Synology NAS has 1 Gbps ethernet connections, that will be your theoretical bottleneck, not the eSATA connection.
Answered by: Elaine
Date published: 2024-01-24

Is this compatible with the DS1821+?

Is this compatible with the DS1821+?
Asked by: Michael
Yes it is and it supports creating volumes across different units.
Answered by: Gregorio M.
Date published: 2023-06-25

What's the largest drive that will work with this ...

What's the largest drive that will work with this unit?
Asked by: Laddie
The Synology DX517 5-Bay Expansion Enclosure does not limit the drive capacity.
Answered by: Reuben K
Date published: 2025-08-27

Does the DX517 work with DS415+?

Does the DX517 work with DS415+?
Asked by: Charles
Yes but it only operates as a new volume (you can't expand the volume from your DS415+ across the expansion unit).
Answered by: Eric
Date published: 2020-09-22

Does the expansions need to have all there bays ...

Does the expansions need to have all there bays filled with drives or at least three drives be a good starting point to start?
Asked by: Ramon
You can choose to use as many or few of the Synology DX517 5-Bay Expansion Enclosure's drive bays as you would like to when adding the enclosure to an existing NAS setup.
Answered by: Paige K
Date published: 2023-12-03
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