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CPU
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)	v
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
Maximum Drive Bays with Expansion Unit	7
Compatible Drive Type* (See all supported drives)	3.5" SATA HDD 2.5" SATA HDD 2.5" SATA SSD
Maximum Internal Raw Capacity	24 TB (12 TB drive x 2) (Capacity may vary by RAID types)
Maximum Raw Capacity with Expansion Units	84 TB (24 TB + 12 TB drive x 5) (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	2 (with Link Aggregation / Failover support)
USB 3.0 Port	3
eSATA Port	1
Copy Button	v
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)	157 mm x 103.5 mm x 232 mm
Weight	1.74 kg
Others
System Fan	92 mm x 92 mm x 1 pcs
Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode
Brightness adjustable front LED indicators	v
Power Recovery	v
Noise Level*	18.4 dB(A)
Scheduled Power On/Off	v
Wake on LAN/WAN	v
Power Supply Unit / Adapter	65W
AC Input Power Voltage	100V to 240V AC
Power Frequency	50/60 Hz, Single Phase
Power Consumption*	20.1 W (Access) 9.1 W (HDD Hibernation)
British Thermal Unit	68.58 BTU/hr (Access) 31.05 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	EAC VCCI CCC RCM KC FCC CE BSMI
Warranty	3 Years
Notes	Power 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 Number	512
Maximum iSCSI Target Number	32
Maximum iSCSI LUN	256
iSCSI LUN Clone/Snapshot, Windows ODX	v
SSD Read/Write Cache (White Paper)	v
SSD TRIM	v
Supported RAID Type	Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 RAID 5 (with Expansion Unit) RAID 6 (with Expansion Unit) RAID 10 (with Expansion Unit)
RAID Migration	Basic to RAID 1 Basic to RAID 5 (with Expansion Unit) RAID 1 to RAID 5 (with Expansion Unit) RAID 5 to RAID 6 (with Expansion Unit)
Volume Expansion with Larger HDDs	Synology Hybrid RAID RAID 1 RAID 5 (with Expansion Unit) RAID 6 (with Expansion Unit)
Volume Expansion by Adding a HDD	Synology Hybrid RAID RAID 5 (with Expansion Unit) RAID 6 (with Expansion Unit) JBOD (with Expansion Unit)
Global Hot Spare Supported RAID Type	Synology Hybrid RAID RAID 1 (with Expansion Unit) RAID 5 (with Expansion Unit) 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	500
Windows Access Control List (ACL) Integration	v
NFS Kerberos Authentication	v
High Availability Manager	v
Log Center	v
Syslog Events per Second	800
Virtualization
VMware vSphere 6 with VAAI	v
Windows Server 2012	v
Windows Server 2012 R2	v
Citrix Ready	v
OpenStack	v
Add-on Packages (learn more about the complete add-on package list)
Antivirus by McAfee (Trial)	v
Central Management System	v
Chat	v
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	v
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 862 ms
Maximum Number of Synced Files (ext4)	1,000,000 / single file reaction time 351 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 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	v
Download Station	v
Maximum Concurrent Download Tasks	80
Drive	v
Maximum Number of Synced Files	500,000 / single file reaction time 362 ms
Maximum Number of Concurrent Connections for PC Clients	450
Notes	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)	v
MailPlus / MailPlus Server	v
Free Email Accounts	5 (Licenses required for additional accounts)
Recommended MailPlus Client Number	Up to 90 (Btrfs) / 90 (ext4)
Maximum Server Performance	831,000 (Btrfs) / 966,000 (ext4) emails per day, approx. 25.4 GB (Btrfs) / 29.5 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	v
DLNA Compliance	v
Moments	v
Facial recognition	v
Subject recognition	v
Office	v
Maximum Users	1800
Notes	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	v
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) 800 FPS @ 1080p (1920×1080) 350 FPS @ 3M (2048x1536) 280 FPS @ 5M (2591x1944) 170 FPS @ 4K (3840x2160)
Total FPS (H.265)*	1200 FPS @ 720p (1280x720) 1200 FPS @ 1080p (1920×1080) 600 FPS @ 3M (2048x1536) 480 FPS @ 5M (2591x1944) 200 FPS @ 4K (3840x2160)
Total FPS (MJPEG)*	450 FPS @ 720p (1280x720) 250 FPS @ 1080p (1920×1080) 200 FPS @ 3M (2048x1536) 100 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	v
Maximum Virtual DSM Number (Licenses required)	2 (including 1 Free License) (Learn more)
Notes	Virtual Machine Manager is not supported on hosts running Synology High Availability.
VPN Server	v
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 DDR3 non-ECC SO-DIMM Expansion Unit: DX517 X 1 VS360HD VS960HD

DS718+

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