Applied Models Supports creating volumes across different units FS series:FS6400, FS3600, FS3400 Notes Expansion Unit FX2421 can only be used with identical expansion units. DSM version requirement: 6.2.3-25426-2 or later version. To have better performance, we recommend creating storage volumes physically located within the same NAS or Expansion Unit, rather than creating volumes across your NAS and Expansion Unit. Storage Drive Bays 24 Compatible Drive Type 2.5" SAS HDD 2.5" SAS SSD 2.5" SATA SSD Maximum Internal Raw Capacity 92.16 TB (3.84 TB drive x 24) (Capacity may vary by RAID types) Hot Swappable Drive Yes RAID Management through Synology DSM Yes Notes "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay. External Ports SAS IN-port 1 SAS OUT-port 1 Appearance Rack Installation Support 4-post 19" rack (Synology Rail Kit - RKS1317) Notes The rail kit is sold separately Power Power Supply Unit / Adapter 500 W AC Input Power Voltage 100 V to 240 V AC Power Frequency 50/60 Hz, Single Phase Power Consumption 190.99 W (Access) British Thermal Unit 651.68 BTU/hr (Access) Redundant Power Supply (for RP model) Yes Notes Power consumption is measured when it is fully loaded with HGST 1.8TB HUC101818CS4204 hard drive(s). Temperature Operating Temperature 0oC to 35oC (32oF to 95oF) Storage Temperature -20oC to 60oC (-5oF to 140oF) Relative Humidity 5% to 95% RH Others System Fan 80 mm x 80 mm x 4 pcs Easy Replacement System Fan Yes Noise Level 57 dB(A) Notes Noise Level Testing Environment: Fully loaded with Toshiba 600GB AL14SEB060N hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A), Temperature: 24.25-25.75oC, Humidity: 58.2-61.8% Certification UL Environment and Packaging Environment RoHS Compliant Packaging Content Main Unit X 1 Accessory Pack X 1 AC Power Cord X 2 Expansion Cable: MiniSAS-HD X 1 Quick Installation Guide X 1 Optional Accessories 2.5" SATA SSD: SAT5200 Rail Kit Sliding: RKS1317 Item Dimension (L"x W"x H") 28 x 17 x 4 Weight 31.97 LB Warranty Information 5 Years