Synology RX1213sas delivers an effortless storage capacity expansion solution for Synology Rack Station RS10613xs+ by adding 12 drives on-the-fly while directly connected. When storage capacity on the Synology RS10613xs+ reaches its limit, Synology RX1213sas provides an easy way to immediately scale up by additional 12 SATA, SAS, or SSD drives for flexibility & balanced performance. Volumes on the Synology RS10613xs+ can be expanded directly without having to reformat existing drives, ensuring that service on Synology RS10613xs+ continues during capacity expansion. Created as an independent volume, Synology RX1213sas provides an easy means of backing up Synology RS10613xs+. Internal HDD/SSD: 3.5" or 2.5" SATAII/SATAIII/SAS X12 (Hard drive not included) Expansion Port: In X 2, Out X 2 Hot Swappable HDD: Yes Volume Type: Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10 Global Hot Spare Supported RAID Type: RAID 1, RAID 5, RAID 6, RAID 10 Size (Hx Wx D): 88mm X 445mm X 570mm Weight: 14.385kg Rail Kit: Synology 2U Rail Kit Sliding (optional) System Fan: 80x 80mm X 4 Noise Level: 54.6 d B (A)1 Power Recovery: Sync with the connected Rack Station AC Input Power Voltage: 100V to 240V Power Frequency: 50 Hz to 60 Hz, Single Phase Operating Temperature: 5°C to 35°C (40°F to 95°F) Storage temperature: -10°C to 70°C (15°F to 155°F) Relative Humidity: 5% to 95% RH Supported Models 2: RS10613xs+ Easy Replacement System Fan