Expansion Unit DX517 DX517 Features: 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. 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. 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. 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: Storage Drive Bays 5 Compatible Drive Type 3.5" SATA HDD 2.5" SATA HDD 2.5" SATA SSD Maximum Internal Raw Capacity 80 TB (16 TB drive x 5) Hot Swappable Drive Yes RAID Management through Synology DSM Yes External Ports eSATA Port 1 PCIe PCIe Expansion 1 x Gen3 x8 slot (x4 link) Appearance Size (Height x Width x Depth) 157 mm x 248 mm x 233 mm Weight 3.91 kg Power Power Recovery Synchronized with the Synology DiskStation Power Supply Unit / Adapter 200 W AC Input Power Voltage 100 V to 240 V AC Power Frequency 50/60 Hz, Single Phase Power Consumption 29.9 W (Access) 2.4 W (HDD Hibernation) British Thermal Unit 102.02 BTU/hr (Access) 8.19 BTU/hr (HDD Hibernation) Temperature Operating Temperature 5°C to 40°C (40°F to 104°F) Storage Temperature -10°C to 70°C (15°F to 155°F) Relative Humidity 5% to 95% RH Others System Fan 80 mm x 80 mm x 2 pcs Easy Replacement System Fan Yes Noise Level 21.5 dB(A) Certification FCC CE BSMI Warranty 3 Years