Synology DX517 5 Bay Expansion Unit
Effortless capacity expansion for Synology DiskStation solutions on-the-fly. 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.
Effortless capacity expansion for Synology DiskStation solutions on-the-fly. 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.
Effortless capacity expansion for Synology DiskStation solutions on-the-fly. 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.
Effortless capacity expansion for Synology DiskStation solutions on-the-fly. 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.
in 32 offers
The lowest price for Synology DX517 5 Bay Expansion Unit right now is $730.74 at 友和 Yoho, compared across 30 retailers.
The all-time low was $684.28 on 12 Feb 2026 — today's price is 7% above the lowest ever. That's a little above the best price we've seen.
Prices last updated 18 July 2026.
Last updated at 18/07/2026 22:29:06
Mastercard $100 OFF | Synology Expansion DX517 NAS
Delivery $98.67
Synology DX517 5-Bays 200W Storage Enclosure Expansion Unit
Free delivery between Tue – Sat
Synology 3.5in 5-Bay Expansion Unit (DX517)
Synology DX517 5 Bay Expansion Unit
Delivery between 22–27 July $23.20
Synology Expansion Unit DX517 5-Bay 3.5" Diskless NAS for Scalable Compatible Models (SMB) DS1517+ and DS1817+. 3 year Warranty
Delivery between 23–27 July $20.05
[DX517] Synology DX517 Expansion - ds1517/ds1817
7-day returns
5 Bay Synology DX517 DiskStation Expansion Unit | Best Online Computer Store
Delivery between 24–31 July $15.15
Synology DiskStation DX517 5-Bay 3.5"/2.5" SATA Expansion Unit
Delivery $16.95
Synology DiskStation DX517 5-Bay 3.5"/2.5" SATA Expansion Unit
Free delivery between Tue – Fri
Synology DiskStation DX517 5-Bay 3.5"/2.5" SATA Expansion Unit
Delivery $16.95
| Form Factor | Tower |
| Scalable | No |
| HDD Pre-Installed | Diskless |
| Drive Bays | 5 |
| Drive Bay Configuration (#) | 3.5" (5), 2.5" supported by optional adapter |
Mastercard $100 OFF | Synology Expansion DX517 NAS
Delivery $98.67
Synology DX517 5-Bays 200W Storage Enclosure Expansion Unit
Free delivery between Tue – Sat
Synology 3.5in 5-Bay Expansion Unit (DX517)
Synology DX517 5 Bay Expansion Unit
Delivery between 22–27 July $23.20
Synology Expansion Unit DX517 5-Bay 3.5" Diskless NAS for Scalable Compatible Models (SMB) DS1517+ and DS1817+. 3 year Warranty
Delivery between 23–27 July $20.05
| Form Factor | Tower |
| Scalable | No |
| HDD Pre-Installed | Diskless |
| Drive Bays | 5 |
| Drive Bay Configuration (#) | 3.5" (5), 2.5" supported by optional adapter |
