Synology DiskStation DS218j 2-Bay

Hardware SpecificationsCPUCPU ModelMarvell Armada 385 88F6820CPU Architecture32-bitCPU FrequencyDual Core 1.3 GHzHardware Encryption EngineMemorySystem Memory512 MB DDR3StorageDrive Bays2Compatible 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 Capacity24 TB (12 TB drive x 2) (Capacity may vary by RAID types)Maximum Single Volume Size16 TBNotes

• "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 PortsRJ-45 1GbE LAN Port1USB 3.0 Port2File SystemInternal DrivesEXT4External Drives

• EXT4
• EXT3
• FAT
• NTFS
• HFS+*
• exFAT*

Notes

• HFS+ is read only, max 2TB volume size.
• exFAT Access is purchased separately in Package Center.

AppearanceSize (Height x Width x Depth)165 mm x 100 mm x 225.5 mm 
Weight0.88 kg 
OthersSystem Fan92 mm x 92 mm x 1 pcsFan Speed Mode

• Full-Speed Mode
• Cool Mode
• Quiet Mode
• Low-power Mode

Brightness adjustable front LED indicatorsPower RecoveryNoise Level*18.2 dB(A) 
Scheduled Power On/OffWake on LAN/WANPower Supply Unit / Adapter60W 
AC Input Power Voltage100V to 240V ACPower Frequency50/60 Hz, Single PhasePower Consumption*17.48 W (Access) 
7.03 W (HDD Hibernation) 
British Thermal Unit59.68 BTU/hr (Access) 
24 BTU/hr (HDD Hibernation) 
Environment TemperatureOperating Temperature5°C to 40°C (40°F to 104°F)Storage Temperature-20°C to 60°C (-5°F to 140°F)Relative Humidity5% to 95% RHCertification

• FCC
• CE
• BSMI
• EAC
• CCC
• RCM
• KC

Warranty2 YearsNotesPower consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).DSM Specifications ( See more )Storage ManagementMaximum Internal Volume Number256Maximum iSCSI Target Number10Maximum iSCSI LUN10Supported RAID Type

• Synology Hybrid RAID
• Basic
• JBOD
• RAID 0
• RAID 1

RAID MigrationBasic to RAID 1Volume Expansion with Larger HDDs

• Synology Hybrid RAID
• RAID 1

Volume Expansion by Adding a HDDSynology Hybrid RAIDFile Sharing CapacityMaximum Local User Accounts1024Maximum Local Groups256Maximum Shared Folder256Maximum Shared Folder Sync Tasks2Maximum Concurrent CIFS/AFP/FTP Connections100Windows Access Control List (ACL) IntegrationNFS Kerberos AuthenticationLog CenterSyslog Events per Second100Add-on Packages (learn more about the complete add-on package list)ChatMaximum Users10Notes

• 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 ServerMaximum Number of Concurrently Connected Devices100Maximum Number of Synced Files (ext4)100,000 / single file reaction time 840 msNotes

• 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.

Download StationMaximum Concurrent Download Tasks30DriveMaximum Number of Synced Files100,000 / single file reaction time 941 msMaximum Number of Concurrent Connections for PC Clients200Notes

• The EXT4 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.
• Non-encrypted shared folders were used during the aforementioned testing.

exFAT Access (optional)Media ServerDLNA ComplianceMomentsFacial recognitionSubject recognitionOfficeMaximum Users200Notes

• 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.
• Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM

Surveillance StationMaximum 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)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 StationVideo TranscodingGroup 2 (See more)VPN ServerMaximum Connections5Environment & PackagingEnvironmentRoHS CompliantPackaging 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