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Rectangular black five-bay desktop NAS enclosure, front drive trays visible

Synology Inc.

Synology Inc. DX525 5-Bay NAS Diskless 72TB

SKU CH-1TN9-NQXBZ MPN DX525

A five-bay desktop expansion unit that adds up to 72 TB of SATA storage to a compatible DiskStation with RAID 0, 1, 5, 6, 10 or JBOD

  • Form factor5-Bay
  • Power draw35.37 W (Access) 7.0 W (HDD Hibernation)
  • Drives includedDiskless System
  • Maximum capacity72 TB
  • Supported RAID modes0, 1, 5, 6, 10, and JBOD
  • Compatible drives3.5 in SATA HDD 2.5 in SATA SSD
  • Expand storage by adding five 3.5" or 2.5" SATA drives
  • Reach up to 72 TB total capacity across five bays
  • Choose RAID 0, 1, 5, 6, 10 or JBOD for data protection
  • Draw only 35.37 W during access and 7.0 W in hibernation
  • Compact 166 mm x 230 mm x 223 mm desktop form factor

Expansion Unit for DiskStation

The Synology DX525 is a 5-bay desktop expansion unit that adds up to 72TB of raw capacity to a compatible DiskStation. It ships without drives and accepts 3.5" SATA HDDs or 2.5" SATA SSDs. The enclosure connects via a supplied USB Type-C expansion cable and runs on a 100V to 240V AC adapter.

Suits owners of compatible DiskStation units.

This unit is designed for users who already own a supported Synology DiskStation and need additional bays without replacing their main system. It supports RAID 0, 1, 5, 6, 10 and JBOD configurations managed through DSM. Buyers who do not have a compatible host NAS cannot use this product as independent network storage.

5-bay SATA expansion over USB Type-C

The single defining specification is the five drive bays connected to the host through a USB Type-C expansion cable. This interface determines which DiskStation models can attach the unit and governs the maximum throughput for the installed SATA drives. Confirm host compatibility before purchase.

How it compares

Measured against everything we stock in Multi-Bay Desktop NAS, at today’s prices. Recalculated every night.

Price $427.99
Cheaper than about 60% of the 230 comparable items (median $562.49).

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Specifications

Product
Brand nameSynology
Product lineDiskStation
Model nameDX525
Product typeDesktop NAS
Recommended useBackup & stream media through personal cloud
Storage
Drives includedDiskless System
Supported RAID modes0, 1, 5, 6, 10, and JBOD
Power
Power draw35.37 W (Access)
7.0 W (HDD Hibernation)
Power details100 V to 240 V AC
Size & build
Form factor5-Bay
Product dimensions166 mm × 230 mm × 223 mm
Product weight2.46 kg
Shipping weight4.26 kg
Package size305 × 305 × 279 mm
Compatibility
Compatible drives3.5 in SATA HDD
2.5 in SATA SSD
In the box
In the boxMain Unit X 1
Expansion Cable: USB Type-C X 1
Accessory Pack X 1
AC Power Adapter X 1
AC Power Cord X 1
Environment & compliance
Temperature rangeOperating Temperature : 0 °C to 40 °C (32 °F to 104 °F)
Storage Temperature : -20 °C to 60 °C (-5 °F to 140 °F)
Humidity range5% to 95% RH
More details
Maximum capacity72 TB

Questions about this item

What clearance does the 166 mm x 230 mm x 223 mm DX525 need for the included USB Type-C expansion cable?

Allow extra depth behind the 223 mm chassis so the USB Type-C expansion cable can connect without sharp bends.

Which step do users skip when adding the DX525 to an existing DiskStation?

Connect the supplied USB Type-C expansion cable, power on the DX525, then use DSM Storage Manager to initialise the new volume before storing data.

When should the 3.5" SATA drives inside the DX525 be replaced?

Replace any 3.5" SATA drive that DSM reports as degraded or that exceeds the 0 °C to 40 °C operating temperature range during normal use.

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