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 49 offers
The lowest price for Synology DX517 5 Bay Expansion Unit right now is $728.32 at 友和 Yoho, compared across 42 retailers.
The all-time low was $684.28 on 12 Feb 2026 — today's price is 6% above the lowest ever. That's a little above the best price we've seen.
Prices last updated 2 Nov 2026.
Last updated at 02/11/2026 23:30:09
Mastercard $100 OFF | Synology Expansion DX517 NAS
Delivery $98.35
Synology DX517 disk array Desktop Black
Synology DX517 disk array Desktop Black
Delivery $19
Synology DX517 ,5-Bay ,3.5" Diskless NAS Expansion Unit
[DX517] Synology DX517 Expansion - ds1517/ds1817
7-day returns
Synology Expansion Unit DX517 5 bay 3.5" Diskless Expansion NAS ( Compatible with Selected models)
Delivery $16.50
Synology DX517 5 Bays Expansion Unit for Synology NAS
Delivery between 5–11 Nov $11.95
Synology 5-Bay Expansion Unit Network Storage (DX517)
Free delivery
Synology DX Expansion Unit 5-Bay (DX517) 5 bays, 3.5"/2.5" SATA, Hot-swappable trays, eSATA port, 200W PSU, 60 TB max, 80mm x2 fans, RAID management
Delivery between 6–16 Nov $12
Synology DX517 Expansion 5 bay unit (DX517)
Delivery between Thu – Mon $9.99
| Data Transfer Speed | About 250 MB/sec max transfer rate (between the DX517 and the host NAS), 600 MB/sec (theoretical maximum supported by the eSATA port specification) |
| Read Speed | 530 MB/s |
| Write Speed | 500 MB/s |
| Hard Drive Spin Speed | 7200 RPM |
| Storage Capacity | 60 TB |
Mastercard $100 OFF | Synology Expansion DX517 NAS
Delivery $98.35
Synology DX517 disk array Desktop Black
Synology DX517 disk array Desktop Black
Delivery $19
Synology DX517 ,5-Bay ,3.5" Diskless NAS Expansion Unit
[DX517] Synology DX517 Expansion - ds1517/ds1817
7-day returns
| Data Transfer Speed | About 250 MB/sec max transfer rate (between the DX517 and the host NAS), 600 MB/sec (theoretical maximum supported by the eSATA port specification) |
| Read Speed | 530 MB/s |
| Write Speed | 500 MB/s |
| Hard Drive Spin Speed | 7200 RPM |
| Storage Capacity | 60 TB |
