| Manufacturer model | DS223j |
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| CPU - CPU Model | Realtek RTD1619B |
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| CPU - CPU Quantity | 1 |
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| CPU - CPU Cores | 4 |
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| CPU - CPU Threads | 4 |
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| CPU - CPU Architecture | 64-bit |
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| CPU - CPU Frequency | 1.7 GHz |
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| Memory - System Memory | 1 GB DDR4 non-ECC |
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| Memory measurement/compatibility conditions | Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and performance. |
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| Storage - Drive Bays (See all supported drives) | 2 × 3.5" SATA HDD or 2.5" SATA SSD |
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| Storage - Hot Swappable Drive* | - |
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| Storage measurement/compatibility conditions | To install 2.5" drives, optional drive holder (Type C) must be purchased separately. Learn more |
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| External Ports - RJ-45 1GbE LAN Port | 1 |
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| External Ports - USB 3.2 Gen 1 Port | 2 |
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| External Ports measurement/compatibility conditions | MTU value of 1GbE LAN port has a limit of 1500. |
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| Appearance - Size (Height × Width × Depth) | 165 mm × 100 mm × 225.5 mm |
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| Appearance - Weight | 0.88 kg |
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| Others - System Fan | 92 mm × 92 mm × 1 pcs |
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| Others - Fan Speed Mode | Full-Speed Mode Cool Mode Quiet Mode Low-power Mode |
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| Others - Noise Level | 18.2 dB(A) |
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| Others - Power Supply Unit / Adapter | 60 watts |
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| Others - AC Input Power Voltage | 100V to 240V AC |
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| Others - Power Frequency | 50/60 Hz, Single Phase |
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| Others - Power Consumption | 16.31 watts (Access) 4 watts (HDD Hibernation) |
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| Others - British Thermal Unit | 55.62 BTU/hr (Access) 13.64 BTU/hr (HDD Hibernation) |
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| Others measurement/compatibility conditions | For more information on how power consumption is measured, refer to this article . 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% |
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| Temperature - Operating Temperature | 0°C to 40°C (32°F to 104°F) |
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| Temperature - Storage Temperature | -20°C to 60°C (-5°F to 140°F) |
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| Temperature - Operating Humidity | 8% to 80% RH |
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| Temperature - Storage Humidity | 5% to 95% RH |
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| Certification | FCC CE BSMI VCCI RCM UKCA EAC CCC KC BIS |
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| Environment | RoHS Compliant |
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| Storage Management - Maximum Single Volume Size | 108 TB |
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| Storage Management - Maximum Internal Volume Number | 64 |
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| Storage Management - Supported RAID Type | Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 |
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| Storage Management - RAID Migration | Basic to RAID 1 |
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| Storage Management - Volume Expansion with Larger HDDs | Synology Hybrid RAID RAID 1 |
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| Storage Management measurement/compatibility conditions | Actual maximum storage pool and volume sizes vary depending on drives used, the number of drive bays available, and the RAID configuration. Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored. |
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| File System - Internal Drives | Btrfs ext4 |
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| File System - External Drives | Btrfs ext4 ext3 FAT32 NTFS HFS+ exFAT |
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| File System measurement/compatibility conditions | Btrfs file system is available from DSM 7.2-64570. |
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| File Services - File Protocol | SMB AFP NFS FTP WebDAV Rsync |
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| File Services - Maximum Number of SMB Connections (FSCT-Based) | 5 |
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| File Services measurement/compatibility conditions | Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration: Test workload: HomeFolder scenario provided by the FSCT tool Test duration: 600 seconds Domain controller & FSCT controller: Windows Server 2022 FSCT clients: 8 × Windows 10 machines SMB feature: Directory leasing enabled |
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| Account & Shared Folder - Maximum Local User Accounts | 256 |
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| Account & Shared Folder - Maximum Local Groups | 64 |
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| Account & Shared Folder - Maximum Shared Folder | 64 |
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| Account & Shared Folder - Maximum Shared Folder Sync Tasks | 2 |
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| Log Center - Syslog Events per Second | 200 |
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| General Specifications - Supported Protocols | SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV |
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| General Specifications - Supported Browsers | Chrome Firefox Edge Safari |
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| General Specifications - 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 |
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| General Specifications measurement/compatibility conditions | For an updated list of supported browser versions, check the DSM Technical Specifications . |
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| Download Station - Maximum Concurrent Download Tasks | 80 |
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| SAN Manager - Maximum iSCSI Target Number | 2 |
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| SAN Manager - Maximum LUN | 4 |
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| Snapshot Replication - Maximum Snapshots per Shared Folder | 128 |
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| Snapshot Replication - Maximum Snapshots per LUN | 32 |
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| Snapshot Replication - Maximum Snapshots per System | 1,024 |
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| Snapshot Replication - Maximum Replication Tasks for Shared Folders | 16 |
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| Snapshot Replication - Maximum Replication Tasks for LUNs | 8 |
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| Snapshot Replication - Maximum Replication Tasks per System | 16 |
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| Snapshot Replication measurement/compatibility conditions | Snapshot Replication is available from DSM 7.2-64570. |
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| Surveillance Station - Default Licenses | 2 (Additional cameras require purchase of licenses) |
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| Surveillance Station - Maximum IP Cameras and Total FPS (H.264) | 1080p: 12 channels, 360 FPS 3M: 12 channels, 300 FPS 5M: 12 channels, 150 FPS 4K: 11 channels, 110 FPS |
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| Surveillance Station - Maximum IP Cameras and Total FPS (H.265) | 1080p: 12 channels, 360 FPS 3M: 12 channels, 360 FPS 5M: 12 channels, 350 FPS 4K: 12 channels, 200 FPS |
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| Surveillance Station measurement/compatibility conditions | Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution. The values above are based on testing with RTSP streaming. If SRTP is enabled for all cameras, overall performance will decrease to 70% of the stated figures. |
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| Synology Drive - Maximum Number of Users | 5 |
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| Synology Drive - Maximum Number of Hosted Files | 100,000 (applies to files indexed or hosted by Synology Drive . For file access through other standard protocols, refer to the File Services section above) |
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| Synology Drive measurement/compatibility conditions | The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more Models with SSD support are tested with a single SSD volume. Exceeding the recommended numbers above will not block application operations, but may result in longer response time. Btrfs file system and non-encrypted shared folders were used during the aforementioned testing. |
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| Synology Office - Maximum Number of Users | 5 |
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| Synology Office measurement/compatibility conditions | The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more Models with SSD support are tested with a single SSD volume. Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM |
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| VPN Server - Maximum Connections | 2 |
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| External drive type | NAS enclosure |
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| Power source | External AC adapter |
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| External HDD Type | NAS enclosure |
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| External HDD Power | External AC adapter |
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