Synology Network Attached Storage DS420+ 4bay NAS DiskStation (Diskless) Retail

MPN
DS420+
Hardware Specs

CPU
CPU Model
Intel Celeron J4025
CPU Architecture
64-bit
CPU Frequency
2-core 2.0 (base) / 2.9 (burst) GHz
Hardware Encryption Engine (AES-NI)
Yes

Storage
Drive Bays
4
M.2 Drive Slots
2 (NVMe)
Compatible Drive Type
3.5" SATA HDD
2.5" SATA HDD
2.5" SATA SSD
M.2 2280 NVMe SSD
Maximum Internal Raw Capacity
64 TB (16 TB drive x 4) (Capacity may vary by RAID types)
Maximum Single Volume Size
108 TB
Hot Swappable Drive
Yes
Notes
"Compatible drive type" indicates 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.
Each internal volume (may consist of multiple drives) is expandable up to 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 Center.

Others
System Fan
92 mm x 92 mm x 2 pcs
Fan Speed Mode
Full-Speed Mode
Cool Mode
Quiet Mode
Brightness Adjustable Front LED Indicators
Yes
Power Recovery
Yes
Noise Level
19.8 dB(A)
Scheduled Power On / Off
Yes
Wake on LAN / WAN
Yes
Power Supply Unit / Adapter
90 W
AC Input Power Voltage
100 V to 240 V AC
Power Frequency
50/60 Hz, Single Phase
Power Consumption
28.30 W (Access)
8.45 W (HDD Hibernation)
British Thermal Unit
96.63 BTU/hr (Access)
72.11 BTU/hr (HDD Hibernation)
Notes
Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A), Temperature: 24.25-25.75^oC, Humidity: 58.2-61.8%

Temperature
Operating Temperature
0^oC to 40^oC (32^oF to 104^oF)
Storage Temperature
-20^oC to 60^oC (-5^oF to 140^oF)
Relative Humidity
5% to 95% RH

Certification
EAC
VCCI
CCC
RCM
KC
FCC
CE
BSMI

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
DDR4 non-ECC SODIMM: D4NESO-2666-4G
2.5" SATA SSD: SAT5200
M.2 2280 NVMe SSD: SNV3400
VisualStation: VS960HD/VS360HD
Surveillance Device License Pack
Notes
All memory modules will operate at the maximum frequency specified by the CPU manufacturer.

Software Specs
DSM Specifications

Storage Management
Maximum Internal Volume Number
64
Maximum iSCSI Target Number
128
Maximum iSCSI LUN
256
iSCSI LUN Clone/Snapshot, Windows ODX
Yes
SSD Read / Write Cache
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
Global Hot Spare Supported RAID Type
Synology Hybrid RAID
RAID 1
RAID 5

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 and Shared Folder
Maximum Local User Accounts
2,048
Maximum Local Groups
256
Maximum Shared Folder
512
Maximum Shared Folder Sync Tasks
8

High Availability
Synology High Availability
Yes

Log Center
Syslog Events per Second
400

Virtualization
VMware vSphere 6 with VAAI
Yes
Windows Server 2016
Yes
Citrix Ready
Yes
OpenStack
Yes

General Specifications
Networking Protocols
SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
Chrome
Firefox
Edge
Internet Explorer 10 onwards
Safari 10 onwards
Safari (iOS 10 onwards)
Chrome (Android 6.0 onwards)
Supported Language
English, Deutsch, Franais, Italiano, Espaol, Dansk, Norsk, Svenska, Nederlands, , Polski, Magyar, Portugus do Brasil, Portugus Europeu, Trke, esk, , , , ,

Add-on Packages

Antivirus by McAfee (Trial)
Yes

Central Management System
Yes

Synology Chat
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.

Document Viewer
Yes

Download Station
Maximum Concurrent Download Tasks
80

exFAT Access (Optional)
Yes

Synology MailPlus / MailPlus Server
Free Email Accounts
5
Maximum Number of Concurrent Users
50
Maximum Server Performance
936,000 emails per day, approx. 28GB
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 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
Yes

Moments
Facial Recognition
Yes
Subject Recognition
Yes
Auto Color and Rotate
Yes
Moments Select
Yes

Snapshot Replication
Maximum Snapshots per Shared Folder
1,024
Maximum of System Snapshots
65,536

Surveillance Station
Maximum IP cam
25 (including 2 Free License)
Total FPS (H.264)
750 FPS at 720p (1280x720)
700 FPS at 1080p (1920x1080)
350 FPS at 3M (2048x1536)
240 FPS at 5M (2591x1944)
120 FPS at 4K (3840x2160)
Total FPS (H.265)
750 FPS at 720p (1280x720)
750 FPS at 1080p (1920x1080)
500 FPS at 3M (2048x1536)
250 FPS at 5M (2591x1944)
200 FPS at 4K (3840x2160)
Total FPS (MJPEG)
450 FPS at 720p (1280x720)
250 FPS at 1080p (1920x1080)
160 FPS at 3M (2048x1536)
130 FPS at 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.
The maximum channel number also includes devices installed on Virtual DSM.
Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).

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
350 (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
600
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
Yes

Virtual Machine Manager
Recommended Virtual Machine Instances
2
Recommended Virtual DSM Number
2 (including 1 Free License)
Notes
The specifications vary depending on system configuration and memory size.

VPN Server
Maximum Connections
30