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 4 GB DDR4
Memory Module Pre-installed 4 GB x 1
Total Memory Slots 2
Memory Expandable up to 32 GB (16 GB x 2)
Storage
Drive Bay(s) 8
Maximum Drive Bays with Expansion Unit 18
Compatible Drive Type (See all supported drives) 3.5" SATA HDD
2.5" SATA HDD
2.5" SATA SSD
Maximum Internal Raw Capacity 112 TB (14 TB HDD x 8) (Capacity may vary by RAID types)
Maximum Raw Capacity with Expansion Units 252 TB (112 TB + 14 TB drive x 10) (Capacity may vary by RAID types)
Maximum Single Volume Size 108 TB
Hot Swappable Drive Yes
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.
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)
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 Expansion 1 x Gen3 x8 slot (black, x4 link)
Add-in-card support M2D18 - Dual M.2 SATA/NVMe 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) 120 mm x 120 mm x 2 pcs
Others
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* 22.2 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* 66.96 W (Access)
29.39 W (HDD Hibernation)
British Thermal Unit 228.63 BTU/hr (Access)
100.35 BTU/hr (HDD 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
KC
Warranty 3 Years
Notes Power consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
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
Account & Shared Folder
Maximum User Accounts 2048
Maximum Groups 256
Maximum Shared Folder 512
Maximum Shared Folder Sync Tasks 16
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 (See more)
Antivirus by McAfee (Trial) Yes
Central Management System Yes
Chat Yes
Maximum Users 1500
Notes The number of concurrent HTTP connections for Chat was configured to the maximum.
CPU and RAM usage were both under 80% when the number of maximum users was reached.
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 The maximum number of concurrently connected devices refers to the maximum number of devices that can remain connected at the same time.
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.
Non-encrypted shared folders were used during the aforementioned testing.
Document Viewer Yes
Download Station Yes
Maximum Concurrent Download Tasks 80
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 The CPU and RAM usage were both under 80% when testing the maximum number of concurrent users.
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 Yes
DLNA Compliance Yes
Moments Yes
Facial recognition Yes
Subject recognition Yes
Office Yes
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 DDR4 non-ECC SO-DIMM*
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

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