Synology DiskStation DS218j

Form Factor: Tower
CPU: Marvell Armada 385 88F6820/32-bit/Dual Core 1.3 GHz
Memory: 512 MB DDR3
Drive Bays: 2 (HDD not included )
Hot swappable Drive: No
External Ports: RJ-45 1GbE LAN X 1; USB 3.0 X 2
Maximum IP cam (License required): 14 (including 2 Free License)
Warranty: 2 years

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Hardware Specifications
CPU
CPU Model	Marvell Armada 385 88F6820
CPU Architecture	32-bit
CPU Frequency	Dual Core 1.3 GHz
Hardware Encryption Engine
Memory
System Memory	512 MB DDR3
Storage
Drive Bays	2
Compatible Drive Type* (See all supported drives)	3.5" SATA HDD 2.5" SATA HDD (with optional 2.5" Disk Holder) 2.5" SATA SSD (with optional 2.5" Disk Holder)
Maximum Internal Raw Capacity	24 TB (12 TB drive x 2) (Capacity may vary by RAID types)
Maximum Single Volume Size	16 TB
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 raw capacity is not limited by the maximum single volume size. Synology NAS models may utilize capacities over the maximum single volume size as long as each volume created is below the limit. (Learn more)
External Ports
RJ-45 1GbE LAN Port	1
USB 3.0 Port	2
File System
Internal Drives	EXT4
External Drives	EXT4 EXT3 FAT NTFS HFS+* exFAT*
Notes	HFS+ is read only, max 2TB volume size. exFAT Access is purchased separately in Package Center.
Appearance
Size (Height x Width x Depth)	165 mm x 100 mm x 225.5 mm
Weight	0.88 kg
Others
System Fan	92 mm x 92 mm x 1 pcs
Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode Low-power Mode
Brightness adjustable front LED indicators
Power Recovery
Noise Level*	18.2 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*	17.48 W (Access) 7.03 W (HDD Hibernation)
British Thermal Unit	59.68 BTU/hr (Access) 24 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	10
Maximum iSCSI LUN	10
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
File Sharing Capacity
Maximum Local User Accounts	1024
Maximum Local Groups	256
Maximum Shared Folder	256
Maximum Shared Folder Sync Tasks	2
Maximum Concurrent CIFS/AFP/FTP Connections	100
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Log Center
Syslog Events per Second	100
Add-on Packages (learn more about the complete add-on package list)
Chat
Maximum Users	10
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.
Cloud Station Server
Maximum Number of Concurrently Connected Devices	100
Maximum Number of Synced Files (ext4)	100,000 / single file reaction time 840 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.
Download Station
Maximum Concurrent Download Tasks	30
exFAT Access (optional)
Media Server
DLNA Compliance
Office
Maximum Users	10
Maximum Simultaneous Editing Users	10
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
Surveillance Station
Maximum IP cam (Licenses required)	14 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264)*	420 FPS @ 720p (1280x720) 120 FPS @ 1080p (1920×1080) 90 FPS @ 3M (2048x1536) 60 FPS @ 5M (2591x1944) 20 FPS @ 4K (3840x2160)
Total FPS (H.265)*	420 FPS @ 720p (1280x720) 210 FPS @ 1080p (1920×1080) 140 FPS @ 3M (2048x1536) 90 FPS @ 5M (2591x1944) 30 FPS @ 4K (3840x2160)
Total FPS (MJPEG)*	140 FPS @ 720p (1280x720) 70 FPS @ 1080p (1920×1080) 40 FPS @ 3M (2048x1536) 20 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	Group 2 (See more)
VPN Server
Maximum Connections	5
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 Disk Holder: Type C VS360HD VS960HD