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Synology DS218+ DiskStation 2-Bay NAS, Intel Dual Core 2.0GHz, 2GB DDR3L RAM
Features :
Intel Celeron J3355 Dual Core 2.0GHz (Burst up to 2.5GHz)
2GB DDR3L Memory (Total slots: 2)
2-Bay Drive
RJ45 LAN 1GbE Port x 1
USB3.0 Port x 3
eSATA Port x 1
Enable USB Copy
2-Year Warranty
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CPU ModelIntel Celeron J3355
CPU Architecture64-bit
CPU FrequencyDual Core 2.0 burst up to 2.5 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
System Memory2 GB DDR3L
Memory Module Pre-installed2GB (1 x 2GB)
Total Memory Slots2
Memory Expandable up to6 GB (2 GB + 4 GB)
Drive Bays2
Compatible Drive Type
  • 3.5" SATA HDD
  • 2.5" SATA HDD
  • 2.5" SATA SSD
Maximum Internal Raw Capacity20 TB (10 TB drive x 2) (Capacity may vary by RAID types)
Maximum Single Volume Size108 TB
Hot Swappable DriveYes
  • "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.
  • 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 Port1
USB 3.0 Port3
eSATA Port1
File System
Internal Drives
  • Btrfs
  • EXT4
External Drives
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT*
NotesexFAT Access is purchased separately in Package Center.
Size (Height x Width x Depth)165 mm x 108 mm x 232.2 mm
Weight1.30 kg
System Fan92 mm x 92 mm x 1 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Wireless Support (dongle)Yes
Brightness adjustable front LED indicatorsYes
Power RecoveryYes
Noise Level*19.3 dB(A)
Scheduled Power On/OffYes
Wake on LAN/WANYes
Power Supply Unit / Adapter60W
AC Input Power Voltage100V to 240V AC
Power Frequency50/60 Hz, Single Phase
Power Consumption*17.23 W (Access)
5.4 W (HDD Hibernation)
British Thermal Unit58.79 BTU/hr (Access)
18.43 BTU/hr (HDD Hibernation)
Environment Temperature
Operating Temperature5C to 40C (40F to 104F)
Storage Temperature-20C to 60C (-5F to 140F)
Relative Humidity5% to 95% RH
  • FCC Class B
  • CE Class B
  • BSMI Class B
Warranty2 Years
NotesPower consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
DSM Specifications
Storage Management
Maximum Internal Volume Number256
Maximum iSCSI Target Number32
Maximum iSCSI LUN256
iSCSI LUN Clone/Snapshot, Windows ODXYes
Supported RAID Type
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
RAID MigrationBasic to RAID 1
Volume Expansion with Larger HDDs
  • Synology Hybrid RAID
  • RAID 1
Volume Expansion by Adding a HDDSynology Hybrid RAID
SSD Support
File Sharing Capacity
Maximum Local User Accounts2048
Maximum Local Groups256
Maximum Shared Folder256
Maximum Shared Folder Sync Tasks4
Maximum Concurrent CIFS/AFP/FTP Connections500
Windows Access Control List (ACL) IntegrationYes
NFS Kerberos AuthenticationYes
Log CenterYes
Syslog Events per Second400
Add-on Packages
Antivirus by McAfee (Trial)Yes
Central Management SystemYes
Maximum Users1000
  • 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 ServerYes
Maximum Number of Concurrently Connected Devices500
Maximum Number of Concurrently Connected Devices (with RAM expansion)1500
Maximum Number of Synced Files (btrfs)1,000,000 / single file reaction time 681 ms
Maximum Number of Synced Files (ext4)1,000,000 / single file reaction time 341 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 1KByte 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 ViewerYes
Download StationYes
Maximum Concurrent Download Tasks80
exFAT AccessYes
MailPlus / MailPlus ServerYes
Free Email Accounts5(Licenses required for additional accounts)
Recommended MailPlus Client NumberUp to 45 (Btrfs) / 45 (ext4)
Maximum Server Performance181,000 (Btrfs) / 194,000 (ext4) emails per day, approx. 5.5 GB (Btrfs) / 5.9 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 ServerYes
DLNA ComplianceYes
Maximum Users200
Maximum Simultaneous Editing Users60
  • 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 ReplicationYes
Maximum Snapshots per Shared Folder1024
Maximum Snapshots of all Shared Folder65536
Surveillance StationYes
Maximum IP cam (Licenses required)25 (including 2 Free License)
Total FPS (H.264)*750 FPS @ 720p (1280x720)
375 FPS @ 1080p (19201080)
250 FPS @ 3M (2048x1536)
200 FPS @ 5M (2591x1944)
120 FPS @ 4K (3840x2160)
Total FPS (MJPEG)*450 FPS @ 720p (1280x720)
250 FPS @ 1080p (19201080)
160 FPS @ 3M (2048x1536)
130 FPS @ 5M (2591x1944)
Total FPS (H.265)*750 FPS @ 720p (1280x720)
750 FPS @ 1080p (19201080)
450 FPS @ 3M (2048x1536)
250 FPS @ 5M (2591x1944)
200 FPS @ 4K (3840x2160)
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 StationYes
Video Transcoding4K Group 1
Maximum Transcoding Channel Number2 channel, 30 FPS @ 4K (4096 x 2160), H.264 (AVC)/H.265 (HEVC) or
2 channel, 30 FPS @ 1080p (19201080), H.264 (AVC)/H.265 (HEVC)/MPEG-2/VC-1
VPN ServerYes
Maximum Connections20
Environment & Packaging
EnvironmentRoHS 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 1
  • Quick Installation Guide X 1
Optional Accessories
  • Surveillance Device License Pack
  • D3NS1866L-4G RAM Module
  • VS360HD
  • VS960HD


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