• 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.
• 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.
• For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.

2 × 3.5" SATA HDD or 2.5" SATA SSD

2 × M.2 2280 NVMe SSD

• The hot swappable drive feature is not supported by M.2 SSD slots.
• Synology only guarantees full functionality, reliability, and performance for compatible drives. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article.
• SSD cache can be enabled with select compatible SSD. See the compatibility list for model-specific support and details. SSDs are sold separately.

• Full-Speed Mode
• Cool Mode
• Quiet Mode

• For more information on how power consumption is measured, refer to this article.
• Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two G.R.A.S. Type 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75°C; Humidity: 58.2-61.8%

• FCC
• CE
• BSMI
• VCCI
• RCM
• UKCA
• EAC
• CCC
• KC
• BIS

• The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
• EW201/EW202 is only available in Asia, Africa, and Oceania. Refer to the Extended Warranty website for details on supported countries/regions. (Learn more)

• Main Unit × 1
• Accessory Pack × 1
• AC Power Adapter × 1
• AC Power Cord × 1
• RJ-45 LAN Cable × 2

• DDR4 non-ECC SODIMM: D4NS01-4G
• DDR4 ECC SODIMM: D4ES04-4G/D4ES03-8G/D4ES03-16G
• Expansion Units: DX525
• Enterprise Series 3.5" SATA HDD: HAT5300 Series
• Plus Series 3.5" SATA HDD: HAT3300 Series
• Enterprise Series 2.5" SATA SSD: SAT5200 Series
• Enterprise Series M.2 2280 NVMe SSD: SNV3400 & SNV5400 Series

• 200 TB (32 GB memory required)
• 108 TB

• Synology Hybrid RAID
• Basic
• JBOD
• RAID 0
• RAID 1
• RAID 5 (with Expansion Unit)
• RAID 6 (with Expansion Unit)
• RAID 10 (with Expansion Unit)

• Basic to RAID 1
• Basic to RAID 5 (with Expansion Unit)
• RAID 1 to RAID 5 (with Expansion Unit)
• RAID 5 to RAID 6 (with Expansion Unit)

• Synology Hybrid RAID
• RAID 1
• RAID 5 (with Expansion Unit)
• RAID 6 (with Expansion Unit)
• RAID 10 (with Expansion Unit)

• Synology Hybrid RAID (with Expansion Unit)
• JBOD (with Expansion Unit)
• RAID 5 (with Expansion Unit)
• RAID 6 (with Expansion Unit)

• Synology Hybrid RAID (with Expansion Unit)
• RAID 1 (with Expansion Unit)
• RAID 5 (with Expansion Unit)
• RAID 6 (with Expansion Unit)
• RAID 10 (with Expansion Unit)

• Volumes over 108 TB require 32 GB of memory or more.
• Actual maximum storage pool and volume sizes depend on drive sizes 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.
• Creating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments. (Learn more)
• Storage efficiency helps reduce storage space consumption through deduplication and compression. For more information about this feature and its support requirements, please refer to this article.

• Btrfs
• ext4

• Btrfs
• ext4
• ext3
• FAT32
• NTFS
• HFS+
• exFAT

• SMB
• AFP
• NFS
• FTP
• WebDAV
• Rsync

• Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports
• Models with expandable memory are tested with the maximum supported quantity installed.
• 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

• Chrome
• Firefox
• Edge
• Safari

Add-on Packages view the complete package list

• De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text.
• To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.

• Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
• Models with expandable memory are tested with the maximum supported quantity installed.

• The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more
• Models with SSD support are tested with a single SSD volume.
• Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements.
• Operating in high-availability mode will incur additional overhead.
• Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).

• 1080p: 40 channels, 800 FPS
• 3M: 35 channels, 350 FPS
• 5M: 28 channels, 280 FPS
• 4K: 17 channels, 170 FPS

• 1080p: 40 channels, 1200 FPS
• 3M: 40 channels, 600 FPS
• 5M: 40 channels, 480 FPS
• 4K: 20 channels, 200 FPS

• 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.

• 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.
• Models with expandable memory are tested with the maximum supported quantity installed.
• 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.

• 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.
• Models with expandable memory are tested with the maximum supported quantity installed.
• Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM