Synology
Synology DX517 5-Bay Expansion Unit - NAS Storage (Diskless)
★★★★★
Expand Your Storage Capacity with Ease The Synology DX517 is a 5-bay expansion unit designed to seamlessly increase the storage capacity of your compatible Synology DiskStation NAS. This expansion unit allows you to easily add up to 5 additional hard drives, expanding your RAID volume online or d...
$608.98*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.
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Overview
Expand Your Storage Capacity with Ease
The Synology DX517 is a 5-bay expansion unit designed to seamlessly increase the storage capacity of your compatible Synology DiskStation NAS. This expansion unit allows you to easily add up to 5 additional hard drives, expanding your RAID volume online or deploying the drives as a dedicated local backup destination. The hot-swappable drive tray design ensures easy drive replacement, and the unit supports both 2.5" and 3.5" SATA drives.Specifications
- Drive Bays: 5
- Drive Support: 2.5" and 3.5" SATA drives
- Hot-Swappable: Yes
- Dimensions: 157 mm x 248 mm x 233 mm (6.18"D x 9.76"W x 9.17"H)
- Material: Metal
Key Features
Easily add 5 additional drive bays to Synology NAS. Please check Synology website for compatible models
Supporting both 2.5" and 3.5" SATA drives
Hot-swappable drive tray design
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
Specifications
Bays
5
Drive Compatibility
2.5" and 3.5" SATA drives
Features
Hot-swappable drive tray design
Function
Expansion Unit, Local Backup Solution
Compatibility
Synology NAS (compatible models required)
Included Drives
Diskless
Pros & Cons
👍 Pros
- Easily adds 5 additional hot-swappable drive bays to compatible Synology NAS systems for expanded storage.
- Supports both 2.5" and 3.5" SATA drives, offering flexibility in storage drive selection.
- Features a hot-swappable drive tray design, allowing for easy drive replacement or addition without system downtime.
- Can function as a dedicated local backup solution for a Synology DiskStation, enhancing data security.
- Provides a separate volume option for backup, offering a robust local backup strategy in case of system failure.
- Increases overall storage capacity for growing data needs without replacing the main NAS unit.
- The expansion unit is designed for seamless integration with compatible Synology NAS models.
👎 Cons
- Requires a compatible Synology NAS to function; it is not a standalone storage solution.
- Does not include any drives ("Diskless"), requiring separate purchase of 2.5" or 3.5" SATA drives.
- Compatibility must be checked on the Synology website, which adds an extra step for potential buyers.
- While it offers local backup, it doesn't inherently provide offsite or cloud backup capabilities without additional configuration.
- The unit is an expansion, so it won't upgrade the processing power or RAM of the main Synology NAS.
- Only supports SATA drives, limiting options for users who might prefer NVMe or other drive types.
Frequently Asked Questions
How many additional drive bays does the Synology DX517 provide?
The Synology DX517 provides 5 additional drive bays, allowing for significant storage expansion for compatible Synology NAS units.
What types of drives are compatible with this expansion unit?
This expansion unit supports both 2.5" and 3.5" SATA drives, offering flexibility in choosing your preferred storage media.
Can I replace or add drives without shutting down my Synology NAS?
Yes, the Synology DX517 features a hot-swappable drive tray design, which allows for drives to be added or replaced without needing to power down your main Synology DiskStation.
Can this unit be used for data backup?
Yes, the Synology DX517 can be utilized as a dedicated local backup solution for your Synology DiskStation, and when configured as a separate volume, it provides a robust backup option for local hard disks.
Is the Synology DX517 a standalone NAS device?
No, the Synology DX517 is an expansion unit designed to add storage to an existing Synology NAS; it is not a standalone Network Attached Storage device.
Are hard drives included with the Synology DX517?
No, the Synology DX517 is a diskless unit, meaning that 2.5" or 3.5" SATA drives need to be purchased separately.
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