DS918+

DiskStation DS918+

All-around storage solution optimized to safeguard your data

High-speed scalable storage server

Synology DS918+ is designed for small and medium-sized businesses and IT enthusiasts. With a powerful built-in AES-NI hardware encryption engine, DS918+ provides exceptional encrypted file transmission. Also capable of transcoding up to two channels of H.265/H.264 4K videos at the same time, DS918+ is ideal for sharing and storing ultra-high definition media content.

CPU
Quad-core 1.5GHz burst up to 2.3GHz

Network
Dual 1GbE LAN ports

Memory
4GB DDR3L, scalable up to 8GB

Performance
Over 225 MB/s and 221 MB/s encrypted sequential reading and writing

Satisfy your need for performance and capacity

DS918+ supports up to two M.2 NVMe 2280 SSDs, allowing fast system cache creation without occupying internal drive bays. Scalable up to 9 drives with a Synology Expansion Unit DX517, DS918+ answers the need for flexible storage capacity.

Next-generation file system for better data protection

The Btrfs file system introduces advanced storage technologies and optimized snapshots to prevent data corruption and reduce maintenance overhead. While ensuring high-level data integrity, it also offers flexible, efficient data protection and recovery tools.

Flexible Shared Folder / User Quota System provides comprehensive quota control on user accounts and shared folders

Snapshot Replication provides schedulable and storage capacity-saving data protection with 1,024 shared folder backups and 65,000 system-wide snapshots

 
File- or folder-level data restoration accelerates data recovery, providing more flexibility for businesses

 
Automatic file self-healing detects and recovers corrupted files without user intervention

Digital asset protection

Powered by Synology DiskStation Manager (DSM), Synology NAS offers advanced security measures to protect against sudden data loss and potential security holes.

Security Advisor

Analyzes system settings, password strength, network preferences, and removes any possible malware.

AppArmor

A kernel-level enhancement that blocks malicious programs from accessing unauthorized system resources.

AES 256-bit encryption

Encrypt shared folders and network data transmission to keep data from unauthorized access.

2-step verification

Prevent others from logging in to your DSM by generating a one-time password (OTP) on your mobile device.

Trust Level

Customize the trust level in Package Center to avoid installing packages from untrusted sources, safeguarding your NAS from unknown or tampered package files.

Synchronize files across your devices

Cloud Station Suite provides real-time data synchronization across all your devices and other Synology NAS. “Intelliversioning" keeps the most important file versions to better utilize storage space.

4K Multimedia Server

Access and stream your 4K media content anytime and anywhere. DS918+ supports 4K H.264/H.265 online transcoding via Video Station and DS video, allowing 4K videos to be converted and played on the fly on other computers, smartphones, and media players that originally do not support Ultra HD formats.

Surveillance Station

Complete surveillance solution for recording, monitoring, and management.

Collaboration Suite

Synology Office, Calendar and Chat guarantee a secure and high-performance private communication and user-friendly content organization.

File Server/Management

Save additional investment by integrating various network services, web/mail services, management applications into your NAS.

DSM UI

Award-winning operating system with an intuitive user interface and powerful capabilities.

Desktop Backup

Simplified backup solution for your Mac, PC, and mobile devices.

Security

Comprehensive built-in security tools are constantly updated to tackle evolving threats and protect your devices.

Hardware Specifications 
CPU 
CPU ModelIntel Celeron J3455
CPU Architecture64-bit
CPU FrequencyQuad Core 1.5 burst up to 2.3 GHz
Hardware Encryption Engine (AES-NI) 
Hardware Transcoding EngineH.264 (AVC), H.265 (HEVC), MPEG-2 and VC-1; maximum resolution: 4K (4096 x 2160); maximum frame rate per second (FPS): 30
Memory 
System Memory4 GB DDR3L
Memory Module Pre-installed4GB (1 x 4GB)
Total Memory Slots2
Memory Expandable up to8 GB (4 GB x 2)
Storage 
Drive Bays4
Maximum Drive Bays with Expansion Unit9
M.2 NVMe Drive Slots2
Compatible Drive Type* (See all supported drives)3.5" SATA HDD
 2.5" SATA HDD
 2.5" SATA SSD
 M.2 NVMe 2280 SSD
  
Maximum Internal Raw Capacity48 TB (12 TB drive x 4) (Capacity may vary by RAID types)
Maximum Raw Capacity with Expansion Units108 TB (48 TB + 12 TB drive x 5) (Capacity may vary by RAID types)
Maximum Single Volume Size108 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.
 The maximum single volume size is not directly related to the maximum raw capacity. (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 Port2 (with Link Aggregation / Failover support)
USB 3.0 Port2
eSATA Port1
File System 
Internal DrivesBtrfs
 EXT4
  
External DrivesBtrfs
 EXT4
 EXT3
 FAT
 NTFS
 HFS+
 exFAT*
  
NotesexFAT Access is purchased separately in Package Center.
Appearance 
Size (Height x Width x Depth)166 mm x 199 mm x 223 mm
Weight2.28 kg
Others 
System Fan92 mm x 92 mm x 2 pcs
Fan Speed ModeFull-Speed Mode
 Cool Mode
 Quiet Mode
  
Brightness adjustable front LED indicators 
Power Recovery 
Noise Level*19.8 dB(A)
Scheduled Power On/Off 
Wake on LAN/WAN 
Power Supply Unit / Adapter100W
AC Input Power Voltage100V to 240V AC
Power Frequency50/60 Hz, Single Phase
Power Consumption*28.8 W (Access)
 12.6 W (HDD Hibernation)
British Thermal Unit98.27 BTU/hr (Access)
 42.99 BTU/hr (HDD Hibernation)
Environment Temperature 
Operating Temperature5°C to 40°C (40°F to 104°F)
Storage Temperature-20°C to 60°C (-5°F to 140°F)
Relative Humidity5% to 95% RH
CertificationEAC
 VCCI
 CCC
 RCM
 KC
 FCC
 CE
 BSMI
  
Warranty3 Years
NotesPower 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 Number512
Maximum iSCSI Target Number32
Maximum iSCSI LUN256
iSCSI LUN Clone/Snapshot, Windows ODX 
SSD Read/Write Cache (White Paper)  
SSD TRIM 
Supported RAID TypeSynology Hybrid RAID
 Basic
 JBOD
 RAID 0
 RAID 1
 RAID 5
 RAID 6
 RAID 10
  
RAID MigrationBasic to RAID 1
 Basic to RAID 5
 RAID 1 to RAID 5
 RAID 5 to RAID 6
  
Volume Expansion with Larger HDDsSynology Hybrid RAID
 RAID 1
 RAID 5
 RAID 6
  
Volume Expansion by Adding a HDDSynology Hybrid RAID
 RAID 5
 JBOD
 RAID 6 (with Expansion Unit)
  
Global Hot Spare Supported RAID TypeSynology Hybrid RAID
 RAID 1
 RAID 5
 RAID 6 (with Expansion Unit)
 RAID 10 (with Expansion Unit)
  
File Sharing Capacity 
Maximum Local User Accounts2048
Maximum Local Groups256
Maximum Shared Folder512
Maximum Shared Folder Sync Tasks8
Maximum Concurrent CIFS/AFP/FTP Connections1000
Windows Access Control List (ACL) Integration 
NFS Kerberos Authentication 
High Availability Manager 
Log Center 
Syslog Events per Second800
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 Users1500
NotesThe 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 
Maximum Number of Concurrently Connected Devices1000
Maximum Number of Concurrently Connected Devices (with RAM expansion)2000
Maximum Number of Synced Files (btrfs)1,000,000 / single file reaction time 744 ms
Maximum Number of Synced Files (ext4)1,000,000 / single file reaction time 630 ms
NotesThe maximum number of concurrently connected devices refers to the maximum number of devices that can remain connected at the same time. For more information on file processing capability, please refer to the reaction time for file processing.
 File reaction time refers to the preparation time required for other devices to start downloading a 10KByte file from a Synology NAS after the file has been added to the NAS. RAM expansion was not used during testing.
 Non-encrypted shared folders were used during the aforementioned testing.
  
Document Viewer 
Download Station 
Maximum Concurrent Download Tasks80
Drive 
Maximum Number of Synced Files500,000 / single file reaction time 362 ms
Maximum Number of Concurrent Connections for PC Clients450
NotesThe Btrfs file system was used for the purpose of testing.
 The maximum number of concurrent connections refers to the maximum number of connections that could be maintained when the maximum number of synced files was reached.
 File reaction time refers to the preparation time required for other devices to start downloading a 10KByte file from a Synology NAS after the file has been added to the NAS.
 For tested models with expandable memory, the maximum amount of RAM was installed.
 Non-encrypted shared folders were used during the aforementioned testing.
  
exFAT Access (optional) 
MailPlus / MailPlus Server 
Free Email Accounts5 (Licenses required for additional accounts)
Recommended MailPlus Client NumberUp to 90 (Btrfs) / 90 (ext4)
Maximum Server Performance840,000 (Btrfs) / 1,014,000 (ext4) emails per day, approx. 25.6 GB (Btrfs) / 30.9 GB (ext4)
NotesThe 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 Compliance 
Moments 
Facial recognition 
Subject recognition 
Office 
Maximum Users1800
NotesMultiple files were opened for testing and each file was edited by 30 users simultaneously.
 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.
 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 Folder1024
Maximum Snapshots of all Shared Folder65536
Surveillance Station 
Maximum IP cam (Licenses required)40 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264)*1200 FPS @ 720p (1280x720)
 840 FPS @ 1080p (1920×1080)
 550 FPS @ 3M (2048x1536)
 300 FPS @ 5M (2591x1944)
 180 FPS @ 4K (3840x2160)
Total FPS (H.265)*1200 FPS @ 720p (1280x720)
 1200 FPS @ 1080p (1920×1080)
 900 FPS @ 3M (2048x1536)
 550 FPS @ 5M (2591x1944)
 300 FPS @ 4K (3840x2160)
Total FPS (MJPEG)*720 FPS @ 720p (1280x720)
 500 FPS @ 1080p (1920×1080)
 330 FPS @ 3M (2048x1536)
 200 FPS @ 5M (2591x1944)
NotesSurveillance 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 Transcoding4K Group 1 (See more)
Maximum Transcoding Channel Number2 channel, 30 FPS @ 4K (4096 x 2160), H.264 (AVC)/H.265 (HEVC) or
 2 channel, 30 FPS @ 1080p (1920×1080), H.264 (AVC)/H.265 (HEVC)/MPEG-2/VC-1
Virtual Machine Manager 
Maximum Virtual DSM Number (Licenses required)4 (including 1 Free License) (Learn more)
NotesVirtual Machine Manager is not supported on hosts running Synology High Availability.
VPN Server 
Maximum Connections20
Environment & Packaging 
EnvironmentRoHS Compliant
Packaging ContentMain Unit X 1
 Accessory Pack X 1
 AC Power Adapter X 1
 AC Power Cord X 1
 RJ-45 LAN Cable X 2
 Quick Installation Guide X 1