What is the difference between the DS220+ and DS420+ models?

What is the difference between the DS220+ and DS420+ models?

The main difference s between these models is

  • drive bay count – RAID1 vs RAID5/6
  • Warranty – 2 vs 3 years
  • NVMe cache – only 4-bay has it
  • Virtualizations support – only 4 bay has it
  • And copy button – only 2 bay has it

Performance-wise they are very similar since they feature the same CPU, but NVMe cache do help environments with 10 or more people connecting and servers running web site or database or virtual machines.

 

I hope this helps.

 

Synology comparison bellow:

 

 

Hardware Specifications
CPU
CPU Model Intel Celeron J4025 Intel Celeron J4025
CPU Architecture 64-bit 64-bit
CPU Frequency 2-core 2.0 (base) / 2.9 (burst) GHz 2-core 2.0 (base) / 2.9 (burst) GHz
Hardware Encryption Engine (AES-NI)
Memory
System Memory 2 GB DDR4 non-ECC 2 GB DDR4 non-ECC
Total Memory Slots 1 1
Maximum Memory Capacity 6 GB (2 GB + 4 GB) 6 GB (2 GB + 4 GB)
Notes
  • 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.
  • 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.
  • 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.
Storage
Drive Bays 2 4
M.2 Drive Slots 2 (NVMe)
Compatible Drive Type* (See all supported drives)
  • 3.5″ SATA HDD
  • 2.5″ SATA HDD
  • 2.5″ SATA SSD
  • 3.5″ SATA HDD
  • 2.5″ SATA HDD
  • 2.5″ SATA SSD
  • M.2 2280 NVMe SSD
Maximum Single Volume Size* 108 TB 108 TB
Hot Swappable Drive
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.
  • Each internal volume (may consist of multiple drives) is expandable up to 108TB.
  • “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.
  • 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) 2 (with Link Aggregation / Failover support)
USB 3.0 Port 2 2
USB / SD Copy
File System
Internal Drives
  • Btrfs
  • EXT4
  • Btrfs
  • EXT4
External Drives
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT*
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT*
Notes exFAT Access is purchased separately in Package Center. exFAT Access is purchased separately in Package Center.
Appearance
Size (Height x Width x Depth) 165 mm x 108 mm x 232.2 mm 166 mm x 199 mm x 223 mm
Weight 1.30 kg 2.18 kg
Others
System Fan 92 mm x 92 mm x 1 pcs 92 mm x 92 mm x 2 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Brightness Adjustable Front LED Indicators
Power Recovery
Noise Level* 19.3 dB(A) 19.8 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 60 W 90 W
AC Input Power Voltage 100 V to 240 V AC 100 V to 240 V AC
Power Frequency 50/60 Hz, Single Phase 50/60 Hz, Single Phase
Power Consumption* 14.69 W (Access)
4.41 W (HDD Hibernation)
28.30 W (Access)
8.45 W (HDD Hibernation)
British Thermal Unit 50.12 BTU/hr (Access)
15.05 BTU/hr (HDD Hibernation)
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˚C; Humidity: 58.2-61.8%
  • 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˚C; Humidity: 58.2-61.8%
Temperature
Operating Temperature 0°C to 40°C (32°F to 104°F) 0°C to 40°C (32°F to 104°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F) -20°C to 60°C (-5°F to 140°F)
Relative Humidity 5% to 95% RH 5% to 95% RH
Certification
  • EAC
  • VCCI
  • CCC
  • RCM
  • KC
  • FCC
  • CE
  • BSMI
  • EAC
  • VCCI
  • CCC
  • RCM
  • KC
  • FCC
  • CE
  • BSMI
Warranty 2 Years 3-year hardware warranty, extendable to 5-year coverage – EW201
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment RoHS Compliant 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
  • 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
Notes All memory modules will operate at the maximum frequency specified by the CPU manufacturer. All memory modules will operate at the maximum frequency specified by the CPU manufacturer.
DSM Specifications
Storage Management
Maximum Internal Volume Number 64 64
Maximum iSCSI Target Number 128 128
Maximum iSCSI LUN 256 256
iSCSI LUN Clone/Snapshot, Windows ODX
SSD Read / Write Cache (White Paper)
SSD TRIM
Supported RAID Type
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID Migration Basic to RAID 1
  • 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
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Volume Expansion by Adding a HDD Synology Hybrid RAID
  • 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 CIFS/AFP/NFS/FTP/WebDAV
Maximum Concurrent CIFS/AFP/FTP Connections 500 500
Maximum Concurrent CIFS/AFP/FTP Connections (with RAM expansion) 1,500 1,500
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Account & Shared Folder
Maximum Local User Accounts 2,048 2,048
Maximum Local Groups 256 256
Maximum Shared Folder 256 512
Maximum Shared Folder Sync Tasks 8 8
High Availability
Synology High Availability
Log Center
Syslog Events per Second 400 400
Virtualization
VMware vSphere 6 with VAAI
Windows Server 2016
Citrix Ready
OpenStack
General Specifications
Networking Protocols SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV 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)
  • Chrome
  • Firefox
  • Edge
  • Internet Explorer 10 onwards
  • Safari 10 onwards
  • Safari (iOS 10 onwards)
  • Chrome (Android 6.0 onwards)
Supported Language English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文 English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
Add-on Packages view the complete package list
Antivirus by McAfee (Trial)
Central Management System
Synology Chat
Maximum Users 1,000 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.
  • 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
Download Station
Maximum Concurrent Download Tasks 80 80
exFAT Access (Optional)
Synology MailPlus / MailPlus Server
Free Email Accounts 5 (Licenses required for additional accounts) 5 (Licenses required for additional accounts)
Maximum Number of Concurrent Users 50 50
Maximum Server Performance 936,000 emails per day, approx. 28GB 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.
  • 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).
  • 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
Moments
Facial Recognition
Subject Recognition
Auto Color & Rotate
Moments Select
Snapshot Replication
Maximum Snapshots per Shared Folder 1,024 1,024
Maximum of System Snapshots 65,536 65,536
Surveillance Station
Maximum IP cam (Licenses required) 25 (including 2 Free License) (See All Supported IP Cameras) 25 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264) 750 FPS @ 720p (1280×720)
700 FPS @ 1080p (1920×1080)
350 FPS @ 3M (2048×1536)
240 FPS @ 5M (2591×1944)
120 FPS @ 4K (3840×2160)
750 FPS @ 720p (1280×720)
700 FPS @ 1080p (1920×1080)
350 FPS @ 3M (2048×1536)
240 FPS @ 5M (2591×1944)
120 FPS @ 4K (3840×2160)
Total FPS (H.265) 750 FPS @ 720p (1280×720)
750 FPS @ 1080p (1920×1080)
500 FPS @ 3M (2048×1536)
250 FPS @ 5M (2591×1944)
200 FPS @ 4K (3840×2160)
750 FPS @ 720p (1280×720)
750 FPS @ 1080p (1920×1080)
500 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)
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.
  • 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).
  • 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) 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) 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.
  • 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 600 600
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
  • 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
Virtual Machine Manager
Recommended Virtual Machine Instances (Learn more) (Learn more)
Recommended Virtual DSM Number (Licenses required) 2 (including 1 Free License) 2 (including 1 Free License)
Notes The specifications vary depending on system configuration and memory size. The specifications vary depending on system configuration and memory size.
VPN Server
Maximum Connections 30 30

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