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    Synology DiskStation DS918+ Diskless 4 Bay NAS

    Manufacturer: Synology
    Brand Synology Wi-Fi No Hard Disk Capacity No Capacity Warranty 7 Day Replacement LAN Yes AC Powerd Yes USB Version 3.0 *Actual product may vary
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    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.




    Quad-core 1.5GHz burst up to 2.3GHz




    Dual 1GbE LAN ports




    4GB DDR3L, scalable up to 8GB




    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.



    Btrfs: Next generation storage efficiency


    Btrfs file system introduces the most advanced storage technologies to meet the management needs of modern large scale businesses:




    Flexible Shared Folder/User Quota System provides comprehensive quota control on all 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 makes data recovery fast and flexible



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




    Learn more about the benefits of using Btrfs


    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. Learn more



    Security Advisor


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





    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. Learn more



    Cloud Station Sharesync



    Cloud Station Drive



    Cloud Station Server



    DS Cloud


    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. Learn more



    Powered by Synology DSM


    Surveillance Station


    Complete surveillance solution for recording, monitoring, and management.


    Learn more


    Collaboration Suite


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


    Learn more


    All-in-one server


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


    Learn more


    DSM UI


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


    Learn more


    Desktop Backup


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


    Learn more




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


    Learn more




    1Status indicator
    2Drive status indicator
    3Drive tray lock
    4USB 3.0 port


    5Power button and indicator
    6Drive tray
    71GbE RJ-45 port
    8Reset button


    9eSATA port
    10Power port
    12Kensington Security Slot


    13USB 3.0 port
    14M.2 NVMe SSD slot (bottom side)


    Hardware Specifications
    CPU Model Intel Celeron J3455
    CPU Architecture 64-bit
    CPU Frequency Quad Core 1.5 burst up to 2.3 GHz
    Hardware Encryption Engine (AES-NI)  
    Hardware Transcoding Engine H.264 (AVC), H.265 (HEVC), MPEG-2 and VC-1; maximum resolution: 4K (4096 x 2160); maximum frame rate per second (FPS): 30
    System Memory 4 GB DDR3L
    Memory Module Pre-installed 4GB (1 x 4GB)
    Total Memory Slots 2
    Memory Expandable up to 8 GB (4 GB x 2)
    Drive Bays 4
    Maximum Drive Bays with Expansion Unit 9
    M.2 NVMe Drive Slots 2
    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 Capacity 48 TB (12 TB drive x 4) (Capacity may vary by RAID types)
    Maximum Raw Capacity with Expansion Units 108 TB (48 TB + 12 TB drive x 5) (Capacity may vary by RAID types)
    Maximum Single Volume Size 108 TB
    Hot Swappable Drive  

    "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 Port 2 (with Link Aggregation / Failover support)
    USB 3.0 Port 2
    eSATA Port 1
    File System
    Internal Drives



    External Drives








    Notes exFAT Access is purchased separately in Package Center.
    Size (Height x Width x Depth) 166 mm x 199 mm x 223 mm
    Weight 2.28 kg
    System Fan 92 mm x 92 mm x 2 pcs
    Fan Speed Mode

    Full-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 / Adapter 100W
    AC Input Power Voltage 100V to 240V AC
    Power Frequency 50/60 Hz, Single Phase
    Power Consumption* 28.8 W (Access)
    12.6 W (HDD Hibernation)
    British Thermal Unit 98.27 BTU/hr (Access)
    42.99 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









    Notes Power consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
    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  
    SSD Read/Write Cache (White Paper)  
    SSD TRIM  
    Supported RAID Type

    Synology Hybrid RAID



    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 (with Expansion Unit)

    Global Hot Spare Supported RAID Type

    Synology Hybrid RAID

    RAID 1

    RAID 5

    RAID 6 (with Expansion Unit)

    RAID 10 (with Expansion Unit)

    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
    Windows Access Control List (ACL) Integration  
    NFS Kerberos Authentication  
    High Availability Manager  
    Log Center  
    Syslog Events per Second 800
    VMware vSphere 6 with VAAI  
    Windows Server 2012  
    Windows Server 2012 R2  
    Citrix Ready  
    Add-on Packages (learn more about the complete add-on package list)
    Antivirus by McAfee (Trial)  
    Central Management System  
    Maximum Users 1500

    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  
    Maximum Number of Concurrently Connected Devices 1000
    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

    The 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 Tasks 80
    Maximum Number of Synced Files 500,000 / single file reaction time 362 ms
    Maximum Number of Concurrent Connections for PC Clients 450

    The 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 Accounts 5 (Licenses required for additional accounts)
    Recommended MailPlus Client Number Up to 90 (Btrfs) / 90 (ext4)
    Maximum Server Performance 840,000 (Btrfs) / 1,014,000 (ext4) emails per day, approx. 25.6 GB (Btrfs) / 30.9 GB (ext4)

    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 Compliance  
    Facial recognition  
    Subject recognition  
    Maximum Users 1800

    Multiple 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 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 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)
    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 4K Group 1 (See more)
    Maximum Transcoding Channel Number 2 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)
    Notes Virtual Machine Manager is not supported on hosts running Synology High Availability.
    VPN Server  
    Maximum Connections 20
    Environment & Packaging
    Environment RoHS Compliant
    Packaging Content

    Main 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

    Optional Accessories

    Surveillance Device License Pack

    D3NS1866L-4G RAM Module

    Expansion Unit: DX517 X 1



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