| Technical Specifications |
| Hardware | |
| CPU | Realtek RTD1296 4-core 1.4 GHz |
| Memory | 1 GB DDR4 |
| Compatible drive type | 4 x 3.5" or 2.5" SATA HDD/SSD (drives not included) |
| External port | 2 x USB 3.0 port |
| Size (HxWxD) | 184 x 168 x 230 mm |
| Weight | 2.21 kg |
| LAN | 1 x Gigabit (RJ-45) |
| Wake on LAN/WAN | Yes |
| Scheduled power on/of | Yes |
| System fan | 2 (80 x 80 mm) |
| AC input power voltage | 100 V to 240 V AC |
| Power frequency | 50/60 Hz, single phase |
| Operating temperature | 0°C to 40°C (32°F to 104°F) |
| Storage temperature | -20°C to 60°C (-5°F to 140°F) |
| Relative humidity | 5% to 95% RH |
| Maximum operating altitude | 5,000 m (16,400 ft) |
| General DSM Specifications | |
| Networking protocol | SMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN (PPTP, OpenVPN™, L2TP) |
| File system | • Internal: ext4
• External: ext4, ext3, FAT, NTFS, HFS+, exFAT3 |
| Supported RAID type | Synology Hybrid RAID (SHR), Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10 |
| Storage management | • Maximum single volume size: 108TB
• Maximum internal volume: 64 |
| File sharing capability | • Maximum local user account: 1,024
• Maximum local group: 256
• Maximum shared folder: 256
• Maximum concurrent SMB/NFS/AFP/FTP connection: 100 |
| Privilege | Windows Access Control List (ACL), application privilege |
| Directory service | Windows® AD integration: Domain users login via SMB/NFS/AFP/FTP/File Station, LDAP integration |
| Security | Firewall, shared folder encryption, SMB encryption, FTP over SSL/TLS, SFTP, rsync over SSH, login auto block, Let's Encrypt support, HTTPS (customizable cipher suite) |
| Supported client | Windows 7 onwards, Mac OS X® 10.11 onwards |
| Supported browser | Chrome®, Firefox®, Edge®, Internet Explorer® 10 onwards, Safari® 10 onwards; Safari (iOS 10 onwards), Chrome (Android™ 6.0 onwards) on tablets |
| Packages and Applications |
| File Server & Synchronization | |
| Synology Drive | Provides a universal portal to synchronize files across various platforms, including Windows, macOS, Linux, Android and iOS
• Maximum number of hosted files: 100,000
• Maximum number of concurrent connections for PC clients: 200 |
| File Station | Virtual drive, remote folder, Windows ACL editor, compressing/extracting archived files, bandwidth control for specific users or groups, creating sharing links, transfer logs |
| FTP Server | Bandwidth control for TCP connections, custom FTP passive port range, anonymous FTP, FTP SSL/TLS and SFTP protocol, boot over the network with TFTP and PXE support, transfer logs |
| Cloud Sync | One or two-way synchronization with public cloud storage providers including Alibaba Cloud OSS, Amazon Drive, Amazon S3-compatible storage, Backblaze B2, Baidu Cloud, Box, Dropbox, Google Cloud Storage, Google Drive, hubiC, MegaDisk, Microsoft OneDrive, OpenStack Swift-compatible storage, Tencent COS, WebDAV servers, Yandex Disk |
| Universal Search | Offers global searches into applications and files |
| iSCSI Storage | |
| iSCSI Manager | • Maximum iSCSI target: 10
• Maximum iSCSI LUN: 10 |
| Data Protection & Backup Solution | |
| Hyper Backup | Supports local backup, network backup, and backup data to public clouds |
| Backup tools | DSM configuration backup, macOS Time Machine support, Synology Drive Client desktop application
• Shared folder sync - maximum task number: 4 |
| Productivity & Collaboration | |
| Collaboration tools | Supports collaboration with instant message service Synology Chat, online editor Synology Office, and scheduling assistant Synology Calendar
• Chat maximum user: 10
• Office maximum user: 200
• Calendar: support CalDAV and access via mobile devices |
| Note Station | Rich-text note organization and versioning, encryption, sharing, media embedding and attachments |
| Multimedia | |
| Moments | Supports smart AI album with facial and subject recognition, similar photo detection, and photo editing and sharing features. Mobile applications are available on iOS and Android devices. |
| Other packages | Video Station, Photo Station, Audio Station, iTunes® Server |
| Surveillance | |
| Surveillance Station | Maximum IP camera: 16 (total of 480 FPS at 720p, H.264) (Including two free camera licenses; additional cameras require the purchasing of additional licenses) |
| All-in-One Server | |
| VPN Server | Maximum connection: 10, supported VPN protocol: PPTP, OpenVPN™, L2TP/IPSec |
| Mail Server | Supported Mail Server Protocols: POP3, SMTP, IMAP, Support LDAP/AD account |
| Mail Station | Webmail interface for Mail Server to receive emails from multiple POP3 mailboxes, customizable SMTP server |
| Web Station | Virtual host (up to 30 websites), PHP/MariaDB®, third-party applications support |
| Other packages | DNS Server, RADIUS Server, Log Center |
| Others | |
| Storage Analyzer | Volume and quota usage, total size of files, volume usage and trends based on past usage, size of shared folders, large files, most recently modified files, least recently accessed files |
| Antivirus Essential | Full system scan, scheduled scan, white list customization, virus definition auto update |
| iOS/Android™ applications | Synology Drive, DS audio, DS photo, DS video, DS cam, DS file, DS finder, DS note, Moments |
| Other packages | Additional 3rd-party packages available in Package Center |
| Environment and Packaging | |
| Environment safety | RoHS compliant |
| Package content | • DS420j main unit
• Quick Installation Guide
• Accessory pack
• AC power adapter and power cord
• RJ-45 LAN cable |
| Optional accessories | • VisualStation VS360HD, VS960HD
• Surveillance Device License Pack |
| Warranty | 2 years2 |
