CPU

CPU Model

• Intel Celeron J3355

CPU Architecture

• 64-bit

CPU Frequency

• Dual-core 2.0 GHz, burst up to 2.5 GHz

Hardware Encryption Engine

• AES-NI

Hardware Transcoding Engine

• Supported codecs:
  H.265 (HEVC), MPEG-4 Part 2, MPEG-2, VC-1
• Maximum resolution:
  • 4K (3840 x 2160)
• Maximum frame rate per second (FPS):
  • 30

Memory

System Memory

• 2 GB DDR3L

Memory Module Pre-installed

• 2 GB (2 GB x 1)

Total Memory Slots

• 2

Memory Expandable

• Up to 6 GB (2 GB + 4 GB)

Notes

• Synology reserves the right to replace memory modules with the same or higher frequency based on supplier’s product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
• Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.

Storage

Drive Bays

• 6 (un-populated)

Compatible Drive Type

• 2.5″ SATA HDD
• 2.5″ SATA SSD

Maximum Internal Raw Capacity

• 30 TB (5 TB drive x 6) (Capacity may vary by RAID types)

Maximum Single Volume Size

• 108 TB

Hot Swappable Drive

• Yes

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.
• 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

• 2

File System

Internal Drives

• Btrfs
• EXT4

External Drives

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

Notes

• exFAT Access is purchased separately in Package Centre.

Appearance

Dimensions (H x W x D)

• 121 x 151 x 175 mm

Weight

• 1.4 kg

Others

System Fan

• 80 mm x 80 mm x 1 pcs

Fan Speed Mode

• Full-Speed Mode
• Cool Mode
• Quiet Mode

Easy Replacement System Fan

• Yes

Brightness Adjustable Front LED Indicator

• Yes

Power Recovery

• Yes

Noise Level

• 20.5 dB(A)

Scheduled Power On/Off

• Yes

Wake on LAN/WAN

• Yes

Power Supply Unit / Adapter

• 65W

AC Input Power Voltage

• 100V to 240V AC

Power Frequency

• 50/60Hz, Single Phase

Power Consumption

• 34.88 W (Access)
• 7.59 W (HDD Hibernation)

British Thermal Unit

• 119.1 BTU/hr (Access)
• 25.92 BTU/hr (HDD Hibernation)

Temperature

Operating Temperature

• 5ºC to 40ºC (40ºF to 104ºF)

Storage Temperature

• -20ºC to 60ºC (-5ºF to 140ºF)

Relative Humidity

• 5% to 95% RH

Certification

• EAC
• VCCI
• RCM
• FCC
• CE
• BSMI

Notes

• Power consumption is measured when fully loaded with Western Digital 1TB WD10JFCX hard drive(s).
• Noise Level Testing Environment: Fully loaded with WD 1TB WD10JFCX hard drive(s) in idle; Two G.R.A.S. Type 40AE microphones, each set up at 1 metre away from the Synology NAS front and rear; Background noise: 17.2 dB(A); Temperature: 23.6°C; Humidity: 58.2%.

Storage Management

Maximum Internal Volume Number

• 64

Maximum iSCSI Target Number

• 128

Maximum iSCSI LUN

• 256

iSCSI LUN Clone/Snapshot, Windows ODX

• Yes

SSD TRIM

• Yes

Supported RAID Type

• Synology Hybrid RAID
• Basic
• JBOD
• RAID 0
• RAID 1
• RAID 5
• RAID 6
• RAID 10

RAID Migration

• Basic to RAID 1
• Basic to RAID 5
• RAID 1 to RAID 5
• RAID 5 to RAID 6

Volume Expansion with Larger HDDs

• Synology Hybrid RAID
• RAID 1
• RAID 5
• RAID 6
• RAID 10

Volume Expansion by Adding a HDD

• Synology Hybrid RAID
• JBOD
• RAID 5
• RAID 6

Global Hot Spare Supported RAID Type

• Synology Hybrid RAID
• RAID 1
• RAID 5
• RAID 6
• RAID 10

File Services

File Protocol

• CIFS/AFP/NFS/FTP/WebDAV

Maximum Concurrent CIFS/AFP/FTP Connections

• 500

Maximum Concurrent CIFS/AFP/FTP Connections (with RAM expansion)

• 1,500

Windows Access Control List (ACL) Integration

• Yes

NFS Kerberos Authentication

• Yes

Account & Shared Folder

Maximum Local User Accounts

• 2,048

Maximum Local Groups

• 256

Maximum Shared Folder

• 256

Maximum Shared Folder Sync Tasks

• 8

Synology High Availability

• Yes

Log Centre

• Yes

Syslog Events per Second

• 400

Virtualisation

VMware vSphere 6 with VAAI

• Yes

Windows Server 2016

• Yes

Citrix Ready

• Yes

OpenStack

• Yes

Add-on Packages

Antivirus by McAfee (Trial)

• Yes

Central Management System

• Yes

Synology Chat

• Yes

Maximum Users

• 1,000

Notes

• The number of concurrent HTTP connections for Synology 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

• Yes

Recommended Number of Hosted Files

• 500,000

Recommended Number of Concurrent Sync Clients

• 500 (the number of connections that can be maintained when the recommended number of hosted files was reached)

Notes

• The maximum number of concurrently connected devices refers to the maximum number of devices that can remain connected at the same time.
• The maximum number of hosted files refers to the maximum number of files that can be indexed and hosted by the Cloud Station Server service. RAM expansion was not used during testing.
• Non-encrypted shared folders were used during the aforementioned testing.

Document Viewer

• Yes

Download Station

• Yes

Maximum Concurrent Download Tasks

• 80

exFAT Access (Optional)

• Yes

Synology MailPlus / MailPlus Server

• Yes

Free Email Accounts

• 5 (Licences required for additional accounts)

Maximum Number of Concurrent Users

• 50

Notes

• The CPU and RAM usage were both under 80% when testing the maximum number of concurrent users.
• 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 synchronisation 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

• Yes

DLNA Compliance

• Yes

Moments

• Facial Recognition
• Subject Recognition
• Auto Colour & Rotate
• Moments Select

Snapshot Replication

• Yes

Maximum Snapshots per Shared Folder

• 1,024

Maximum of System Snapshots

• 65,536

Surveillance Station

Maximum IP cam (Licences required)

• 25 (including 2 Free Licence)

Total FPS (H.264)

• 750 FPS @ 720p (1280×720)
• 600 FPS @ 1080p (1920×1080)
• 350 FPS @ 3M (2048×1536)
• 250 FPS @ 5M (2591×1944)
• 120 FPS @ 4K (3840×2160)

Total FPS (H.265)

• 750 FPS @ 720p (1280×720)
• 750 FPS @ 1080p (1920×1080)
• 450 FPS @ 3M (2048×1536)
• 250 FPS @ 5M (2591×1944)
• 200 FPS @ 4K (3840×2160)

Total FPS (MJPEG)

• 450 FPS @ 720p (1280×720)
• 250 FPS @ 1080p (1920×1080)
• 160 FPS @ 3M (2048×1536)
• 130 FPS @ 5M (2591×1944)

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.

Synology Drive

Recommended Number of Hosted Files

• 500,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)

Recommended Number of Concurrent Sync Clients

• 450 (the number of connections that can be maintained when the recommended number of hosted files was reached)

Notes

• For tested models with expandable memory, the maximum amount of RAM was installed.
• Exceeding the limits above may result in longer response time in file operations.
• Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.

Synology Office

Maximum Users

• 400

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

Video Station

Video Transcoding

• 4K Group 1

Maximum Transcoding Channel Number

• 2 channel, 30 FPS @ 4K (4096 x 2160), H.264 (AVC)/H.265 (HEVC)
• 2 channel, 30 FPS @ 1080p (1920×1080), H.264 (AVC)/H.265 (HEVC)/MPEG-2/VC-1

Virtual Machine Manager

Recommended Virtual Machine Instances

• 2

Recommended Virtual DSM Number (Licences required)

• 2 (including 1 Free Licence)

Notes

• Virtual Machine Manager is not supported on hosts running Synology High Availability.
• The specifications vary depending on system configuration and memory size.

VPN Server

Maximum Connections

• 30

Environment & Packaging

Environment

• RoHS Compliant

Package Contents

• 1 x DS620slim Enclosure
• 1 x AC Power Adapter
• 1 x AC Power Cord
• 2 x RJ-45 LAN Cable
• 1 x Quick Installation Guide