Synology DiskStation DS218+

Form Factor: Tower
CPU: Intel Celeron J3355/64-bit/Dual Core 2.0 burst up to 2.5 GHz
Memory: 2GB (1 x 2GB)/DDR3L (Expandable: 6 GB (2 GB + 4 GB))
Drive Bays: 2 (HDD not included )
Maximum Drive Bays with Expansion Unit: N/A
Hot swappable Drive: Yes
External Ports: RJ-45 1GbE LAN X 1; USB 3.0 X 3, eSATA Port X 1, Copy Button X 1
Maximum IP cam (License required): 25 (including 2 Free License)
Warranty: 3 years

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Hardware Specifications
CPU
CPU Model	Intel Celeron J3355
CPU Architecture	64-bit
CPU Frequency	Dual Core 2.0 burst up to 2.5 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
Memory
System Memory	2 GB DDR3L
Memory Module Pre-installed	2GB (1 x 2GB)
Total Memory Slots	2
Memory Expandable up to	6 GB (2 GB + 4 GB)
Storage
Drive Bays	2
Compatible Drive Type* (See all supported drives)	3.5" SATA HDD 2.5" SATA HDD 2.5" SATA SSD
Maximum Internal Raw Capacity	20 TB (10 TB drive x 2) (Capacity may vary by RAID types)
Maximum Single Volume Size	108 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 Port	1
USB 3.0 Port	3
eSATA Port	1
USBCopy
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)	165 mm x 108 mm x 232.2 mm
Weight	1.30 kg
Others
System Fan	92 mm x 92 mm x 1 pcs
Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode
Wireless Support (dongle)
Brightness adjustable front LED indicators
Power Recovery
Noise Level*	19.3 dB(A)
Scheduled Power On/Off
Wake on LAN/WAN
Power Supply Unit / Adapter	60W
AC Input Power Voltage	100V to 240V AC
Power Frequency	50/60 Hz, Single Phase
Power Consumption*	17.23 W (Access) 5.4 W (HDD Hibernation)
British Thermal Unit	58.79 BTU/hr (Access) 18.43 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
Certification	FCC Class B CE Class B BSMI Class B
Warranty	2 Years
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	256
Maximum iSCSI Target Number	32
Maximum iSCSI LUN	256
iSCSI LUN Clone/Snapshot, Windows ODX
Supported RAID Type	Synology Hybrid RAID Basic JBOD RAID 0 RAID 1
RAID Migration	Basic to RAID 1
Volume Expansion with Larger HDDs	Synology Hybrid RAID RAID 1
Volume Expansion by Adding a HDD	Synology Hybrid RAID
SSD Support
SSD TRIM
File Sharing Capacity
Maximum Local User Accounts	2048
Maximum Local Groups	256
Maximum Shared Folder	256
Maximum Shared Folder Sync Tasks	4
Maximum Concurrent CIFS/AFP/FTP Connections	500
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Log Center
Syslog Events per Second	400
Add-on Packages (learn more about the complete add-on package list)
Antivirus by McAfee (Trial)
Central Management System
Chat
Maximum Users	1000
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
Maximum Number of Concurrently Connected Devices	500
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
Notes	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 Viewer
Download Station
Maximum Concurrent Download Tasks	80
exFAT Access (optional)
MailPlus / MailPlus Server
Free Email Accounts	5 (Licenses required for additional accounts)
Recommended MailPlus Client Number	Up to 45 (Btrfs) / 45 (ext4)
Maximum Server Performance	181,000 (Btrfs) / 194,000 (ext4) emails per day, approx. 5.5 GB (Btrfs) / 5.9 GB (ext4)
Notes	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
Office
Maximum Users	200
Maximum Simultaneous Editing Users	60
Notes	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)	25 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264)*	750 FPS @ 720p (1280x720) 375 FPS @ 1080p (1920×1080) 250 FPS @ 3M (2048x1536) 200 FPS @ 5M (2591x1944) 120 FPS @ 4K (3840x2160)
Total FPS (MJPEG)*	450 FPS @ 720p (1280x720) 250 FPS @ 1080p (1920×1080) 160 FPS @ 3M (2048x1536) 130 FPS @ 5M (2591x1944)
Total FPS (H.265)*	750 FPS @ 720p (1280x720) 750 FPS @ 1080p (1920×1080) 450 FPS @ 3M (2048x1536) 250 FPS @ 5M (2591x1944) 200 FPS @ 4K (3840x2160)
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
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 1 Quick Installation Guide X 1
Optional Accessories	Surveillance Device License Pack D3NS1866L-4G RAM Module VS360HD VS960HD