Hardware Specifications CPU CPU Model Intel Atom C2538 CPU Architecture 64-bit CPU Frequency Quad Core 2.4 GHz Hardware Encryption Engine (AES-NI)  Memory System Memory 2 / 8 GB DDR3 Total Memory Slots 2 Memory Expandable up to 16 GB (8 GB x 2) Storage Drive Bays 5 Maximum Drive Bays with Expansion Unit 15 Compatible Drive Type* (See all supported drives) •3.5" SATA III / SATA II HDD •2.5" SATA III / SATA II HDD •2.5" SATA III / SATA II SSD Maximum Internal Raw Capacity 50 TB (10 TB HDD x 5) (Capacity may vary by RAID types) Maximum Raw Capacity with Expansion Units 150 TB (10 TB HDD x 15) (Capacity may vary by RAID types) Maximum Single Volume Size 108 TB Hot Swappable Drive  Notes •"Compatible drive type" indicates the drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay. •For the optimal SSD cache performance, please see here. •Expansion of the internal volume is only supported if the combined single volume size does not exceed the maximum limit of 108TB. External Ports RJ-45 1GbE LAN Port 4 (with Link Aggregation / Failover support) USB 3.0 Port 4 eSATA Port 2 PCIe PCIe Expansion 1 x Gen2 x8 slot (x4 link) Add-in-card support •M2D17 - Dual M.2 SSD adapter card for SSD cache •PCIe Network Interface Card (Learn more) File System Internal Drives •Btrfs •EXT4 External Drives •Btrfs •EXT4 •EXT3 •FAT •NTFS •HFS+ •exFAT* Notes exFAT Access is purchased separately in Package Center. Appearance Size (Height x Width x Depth) 166 mm x 250 mm x 243 mm Weight 4.46 kg Others System Fan 80 mm x 80 mm x 2 pcs Fan Speed Mode •Cool Mode •Quiet Mode Easy Replacement System Fan  Wireless Support (dongle)  Brightness adjustable front LED indicators  Power Recovery  Noise Level* 26.2 dB(A) Scheduled Power On/Off  Wake on LAN/WAN  Power Supply Unit / Adapter 200W AC Input Power Voltage 100V to 240V AC Power Frequency 50/60 Hz, Single Phase Power Consumption* 42.1 W (Access) 23.1 W (HDD Hibernation) British Thermal Unit 143.7 BTU/hr (Access) 78.9 BTU/hr (HDD Hibernation) Environment Temperature Operating Temperature 5°C to 40°C (40°F to 104°F) Storage Temperature -20°C to 60°C (-5°F to 140°F) Relative Humidity 5% to 95% RH Certification •FCC Class B •CE Class B •BSMI Class B Warranty 3 Years Applicable Extended Warranty EW201 - 2 Year Extension Notes •Power consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s). •Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in idle; Two G.R.A.S. Type 40AE microphones, each set up at 1 meter away from the Synology NAS front and rear; Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8% DSM Specifications ( See more ) Storage Management Maximum Internal Volume Number 512 Maximum iSCSI Target Number 32 Maximum iSCSI LUN 256 iSCSI LUN Clone/Snapshot, Windows ODX  Supported RAID Type •Synology Hybrid RAID •Basic •JBOD •RAID 0 •RAID 1 •RAID 5 •RAID 6 •RAID 10 RAID Migration •Basic to RAID 1 •Basic to RAID 5 •RAID 1 to RAID 5 •RAID 5 to RAID 6 Volume Expansion with Larger HDDs •Synology Hybrid RAID •RAID 1 •RAID 5 •RAID 6 Volume Expansion by Adding a HDD •Synology Hybrid RAID •RAID 5 •RAID 6 •JBOD Global Hot Spare Supported RAID Type •Synology Hybrid RAID •RAID 1 •RAID 5 •RAID 6 •RAID 10 SSD Support SSD Read/Write Cache (White Paper)  SSD TRIM  File Sharing Capacity Maximum Local User Accounts 2048 Maximum Local Groups 256 Maximum Shared Folder 512 Maximum Shared Folder Sync Tasks 8 Maximum Concurrent CIFS/AFP/FTP Connections 512(2GB) / 2048(8GB) Windows Access Control List (ACL) Integration  NFS Kerberos Authentication  High Availability Manager  Log Center  Syslog Events per Second 800 Virtualization VMware vSphere 6 with VAAI  Windows Server 2012  Windows Server 2012 R2  Citrix Ready  OpenStack  Add-on Packages (learn more about the complete add-on package list) Antivirus by McAfee (Trial)  Central Management System  Chat  Maximum Users 400 Notes •The number of concurrent HTTP connections for Chat was configured to the maximum. •CPU and RAM usage were both under 80% when testing the recommended number of clients. •For tested models with expandable memory, the maximum amount of RAM was installed. Cloud Station Server  Maximum Concurrent File Transfers 512 (2GB) / 2000 (8GB) Maximum Concurrent File Transfers (with RAM expansion) 6000 DDSM  Maximum DDSM Number (Licenses required) 30 (including 1 Free License) (Learn more) Document Viewer  Download Station  Maximum Concurrent Download Tasks 80 exFAT Access (optional)  HiDrive Backup  MailPlus / MailPlus Server  Free Email Accounts 5 (Licenses required for additional accounts) Recommended MailPlus Client Number Up to 90 Maximum Server Performance 712,000 emails per day, approx. 21.73GB Notes •The CPU and RAM usages were both under 80% when testing recommended client numbers. •For tested models with expandable memory, the maximum amount of RAM was installed. •Read-write SSD cache was enabled in 5-bay (and above) NAS models with 2 SSDs units installed. •The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers. •Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only). Media Server  DLNA Certification  Office  Maximum Users 400 Maximum Simultaneous Editing Users 80 Notes •CPU and RAM usage were both under 80% when testing the recommended number of clients. •For tested models with expandable memory, the maximum amount of RAM was installed. •Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM Snapshot Replication  Maximum Snapshots per Shared Folder 1024 Maximum Snapshots of all Shared Folder 65536 Surveillance Station  Maximum IP cam (Licenses required) 40 (including 2 Free License) (See All Supported IP Cameras) Total FPS (H.264)* 1200 (2GB RAM) / 1200 (8GB RAM) FPS @ 720p (1280x720) 900 (2GB RAM) / 1080 (8GB RAM) FPS @ 1080p (1920×1080) 320 (2GB RAM) / 480 (8GB RAM) FPS @ 3M (2048x1536) 270 (2GB RAM) / 280 (8GB RAM) FPS @ 5M (2591x1944) Total FPS (MJPEG)* 540 (2GB RAM) / 760 (8GB RAM) FPS @ 720p (1280x720) 200 (2GB RAM) / 400 (8GB RAM) FPS @ 1080p (1920×1080) 150 (2GB RAM) / 280 (8GB RAM) FPS @ 3M (2048x1536) 90 (2GB RAM) / 200 (8GB RAM) FPS @ 5M (2591x1944) Notes Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera. Video Station  Video Transcoding Group 1 - Type 1 (See more) Maximum Transcoding Channel Number 1 channel, 30 FPS @ 1080p(1920×1080), H.264 (AVC)/MPEG-4 Part 2 (XVID, DIVX5)/MPEG-2/VC-1 VPN Server  Maximum Connections 20 Environment & Packaging Environment RoHS Compliant Packaging Content •Main Unit X 1 •Accessory Pack X 1 •AC Power Cord X 1 •RJ-45 LAN Cable X 2 •Quick Installation Guide X 1 Optional Accessories •Surveillance Device License Pack •8GB (4GB x 2) DDR3 RAM Module Kit •16GB (8GB x 2) DDR3 RAM Module Kit •Expansion Unit: DX517 X 2 •VS360HD •Synology Ethernet Adapter E10G15-F1 •Synology Ethernet Adapter E10G17-F2 •Synology M2D17 M.2 SSD adapter card