CPU
CPU Model Intel Atom C3538
CPU Architecture 64-bit
CPU Frequency Quad Core 2.1 GHz
Hardware Encryption Engine (AES-NI) Yes
Memory
System Memory 4GB DDR4
Memory Module Pre-installed 4GB (1 x 4GB)
Total Memory Slots 2
Memory Expandable up to 32GB (16GB x 2)
Storage
Drive Bays 6
Maximum Drive Bays with Expansion Unit 16
Compatible Drive Type* (See all supported drives) 3.5" SATA HDD
2.5" SATA HDD
2.5" SATA SSD
Maximum Internal Raw Capacity 84TB (14TB drive x 6) (Capacity may vary by RAID types)
Maximum Raw Capacity with Expansion Units 224TB (84TB + 14TB drive x 10) (Capacity may vary by RAID types)
Maximum Single Volume Size 108TB
Hot Swappable Drive Yes
Notes 1. "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.
2. The maximum raw capacity is not limited by the maximum single volume size. Synology NAS models may utilize capacities over the maximum single volume size as long as each volume created is below the limit.
(Learn more)
3. 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 3
eSATA Port 2
PCIe
PCIe Expansion 1 x Gen3 x8 slot (black, x4 link)
Add-in-card support M2D17 - Dual M.2 SATA SSD adapter card for SSD cache
M2D18 - Dual M.2 SATA/NVMe SSD adapter card for SSD cache
PCIe Network Interface Card
(Learn more)
Notes DS1618+ with M2D17 can only support M.2 SATA SSD. M.2 NVMe/AHCI PCIe SSD is not supported.
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 282 mm x 243 mm
Weight 5.05 kg
Others
System Fan 92 mm x 92 mm x 2 pcs
Fan Speed Mode Full-Speed Mode
Cool Mode
Quiet Mode
Easy Replacement System Fan Yes
Brightness adjustable front LED indicators Yes
Power Recovery Yes
Noise Level* 23.7 dB(A)
Scheduled Power On/Off Yes
Wake on LAN/WAN Yes
Power Supply Unit / Adapter 250W
AC Input Power Voltage 100V to 240V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption* 56.86 W (Access)
25.76 W (System Hibernation)
British Thermal Unit 194.01 BTU/hr (Access)
87.9 BTU/hr (System Hibernation)
Environment Temperature
Operating Temperature 0°C to 40°C (32°F to 104°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Relative Humidity 5% to 95% RH
Certification FCC
CE
BSMI
EAC
VCCI
CCC
RCM
Warranty 3 Year Hardware Warranty
Notes 1. Power consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
2. 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 128
Maximum iSCSI LUN 256
iSCSI LUN Clone/Snapshot, Windows ODX Yes
SSD Read/Write Cache (White Paper) Yes
SSD TRIM Yes
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
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 1000
Maximum Concurrent CIFS/AFP/FTP Connections (with RAM expansion) 2000
Windows Access Control List (ACL) Integration Yes
NFS Kerberos Authentication Yes
High Availability Manager Yes
Log Center Yes
Syslog Events per Second 800
Virtualization
VMware vSphere 6 with VAAI Yes
Windows Server 2016 Yes
Citrix Ready Yes
OpenStack Yes
Add-on Packages (learn more about the complete add-on package list)
Antivirus by McAfee (Trial) Yes
Central Management System Yes
Chat Yes
Maximum Users 1500
Notes 1. The number of concurrent HTTP connections for Chat was configured to the maximum.
2. CPU and RAM usage were both under 80% when the number of maximum users was reached.
3. For tested models with expandable memory, the maximum amount of RAM was installed.
Cloud Station Server Yes
Maximum Number of Concurrently Connected Devices 1000
Maximum Number of Concurrently Connected Devices (with RAM expansion) 2000
Maximum Number of Hosted Files (btrfs) 1,000,000
Maximum Number of Hosted Files (ext4) 1,000,000
Notes 1. The maximum number of concurrently connected devices refers to the maximum number of devices that can remain connected at the same time.
2. The maximum number of hosted files refers to the maximum number of files that can be indexed and hosted by the Cloud Station Server service. RAM expansion was not used during testing.
3. Non-encrypted shared folders were used during the aforementioned testing.
Document Viewer Yes
Download Station Yes
Maximum Concurrent Download Tasks 80
Drive  
Maximum Number of Hosted Files 1,000,000
Maximum Number of Concurrent Connections for PC Clients 550
Notes 1. The Btrfs file system was used for the purpose of testing.
2. For tested models with expandable memory, the maximum amount of RAM was installed.
exFAT Access (optional) Yes
MailPlus / MailPlus Server Yes
Free Email Accounts 5 (Licenses required for additional accounts)
Maximum number of concurrent users Up to 150
Maximum Server Performance 1,484,000 emails per day, approx. 45GB
Notes 1. The CPU and RAM usage were both under 80% when testing the maximum number of concurrent users.
2. For tested models with expandable memory, the maximum amount of RAM was installed.
3. Read-write SSD cache was enabled in 5-bay (and above) NAS models with 2 SSDs units installed.
4. The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
5. 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 Yes
DLNA Compliance Yes
Moments Yes
Facial recognition Yes
Subject recognition Yes
Office Yes
Maximum Users 1800
Notes 1. Multiple files were opened for testing and each file was edited by 30 users simultaneously.
2. CPU and RAM usage were both under 80% when the number of maximum users was reached.
3. For tested models with expandable memory, the maximum amount of RAM was installed.
4. Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Snapshot Replication Yes
Maximum Snapshots per Shared Folder 1024
Maximum of system snapshots 65536
Surveillance Station Yes
Maximum IP cam (Licenses required) 40 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264)* 1200 FPS @ 720p (1280x720)
960 FPS @ 1080p (1920×1080)
520 FPS @ 3M (2048x1536)
320 FPS @ 5M (2591x1944)
240 FPS @ 4K (3840x2160)
Total FPS (H.265)* 1200 FPS @ 720p (1280x720)
1200 FPS @ 1080p (1920×1080)
880 FPS @ 3M (2048x1536)
520 FPS @ 5M (2591x1944)
400 FPS @ 4K (3840x2160)
Total FPS (MJPEG)* 560 FPS @ 720p (1280x720)
270 FPS @ 1080p (1920×1080)
190 FPS @ 3M (2048x1536)
110 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 Yes
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
Virtual Machine Manager Yes
Recommended Virtual Machine Instances 4 (Learn more)
Recommended Virtual DSM Number (Licenses required) 4 (including 1 Free License)
Notes 1. Virtual Machine Manager is not supported on hosts running Synology High Availability.
2. The specifications vary depending on system configuration and memory size.
VPN Server Yes
Maximum Connections 30
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
D4NS2133-4G
RAMEC2133DDR4SO-16G DDR4 ECC SO-DIMM
Expansion Unit:
DX517 X 2
VS360HD
VS960HD
Synology Ethernet Adapter
E10G18-T1
Synology Ethernet Adapter E10G18-T2
Synology Ethernet Adapter E10G17-F2
Synology M2D18 M.2 SSD adapter card
Notes Mixed usage of non-ECC and ECC UDIMMs is not supported.

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