CPU
Hardware Specifications	DS1825+	DS1825neo+
CPU Model	AMD Ryzen V1500B	AMD Ryzen V1500B
CPU Quantity	1	1
CPU Cores	4	4
CPU Threads	8	8
CPU Architecture	64-bit	64-bit
CPU Frequency	2.2 GHz	2.2 GHz
Hardware Encryption Engine
Memory
System Memory	8 GB DDR4 ECC SODIMM	4 GB DDR4 non-ECC SODIMM
Memory Module Pre-installed	8 GB (8 GB × 1)	4 GB (4 GB × 1)
Total Memory Slots	2	2
Maximum Memory Capacity	32 GB (16 GB × 2)	32 GB (16 GB × 2)
Notes	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.	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.
Storage
Drive Bays (See all supported drives)	8 × 3.5" SATA HDD or 2.5" SATA SSD 2 × M.2 2280 NVMe SSD	8 × 3.5" SATA HDD or 2.5" SATA SSD 2 × M.2 2280 NVMe SSD
Maximum Drive Bays with Expansion Unit	18 (DX525 × 2)	18 (DX525 × 2)
Hot Swappable Drive*
Notes	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.	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.
External Ports
RJ-45 2.5GbE LAN Port	2	2
USB 3.2 Gen 1 Port	3	3
Expansion Port	2	2
Expansion Port Type	USB Type-C	USB Type-C
PCIe
PCIe Expansion	1 × Gen3 x8 slot (x4 link)	1 × Gen3 x8 slot (x4 link)
Appearance
Size (Height × Width × Depth)	166 mm × 343 mm × 243 mm	166 mm × 343 mm × 243 mm
Weight	6 kg	6 kg
Others
System Fan	120 mm × 120 mm × 2 pcs	120 mm × 120 mm × 2 pcs
Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode	Full-Speed Mode Cool Mode Quiet Mode
Easy Replacement System Fan
Brightness Adjustable Front LED Indicators
Power Recovery
Noise Level	23.8 dB(A)	23.8 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter	250 watts	250 watts
AC Input Power Voltage	100V to 240V AC	100V to 240V AC
Power Frequency	50/60 Hz, Single Phase	50/60 Hz, Single Phase
Power Consumption	60.1 watts (Access) / 18.34 watts (HDD Hibernation)	60.1 watts (Access) / 18.34 watts (HDD Hibernation)
British Thermal Unit	204.94 BTU/hr (Access) / 62.54 BTU/hr (HDD Hibernation)	204.94 BTU/hr (Access) / 62.54 BTU/hr (HDD Hibernation)
Notes	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%	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%
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)
Operating Humidity	8% to 80% RH	8% to 80% RH
Storage Humidity	5% to 95% RH	5% to 95% RH
Certification
	FCC CE BSMI VCCI RCM UKCA EAC CCC KC BIS	FCC CE BSMI VCCI RCM UKCA EAC CCC KC BIS
Warranty
	3-year hardware warranty, extendable to 5 years with EW201 or Extended Warranty Plus	3-year hardware warranty, extendable to 5 years with EW201 or Extended Warranty Plus
Notes	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) Extended Warranty Plus is only available in Europe and North America. EW201/EW202 is only available in Asia, Africa, and Oceania. For exact availability information please visit their respective websites.	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) Extended Warranty Plus is only available in Europe and North America. EW201/EW202 is only available in Asia, Africa, and Oceania. For exact availability information please visit their respective websites.
Environment
	RoHS Compliant	RoHS Compliant
Packaging Content
	Main Unit × 1 Accessory Pack × 1 AC Power Cord × 1 RJ-45 LAN Cable × 2	Main Unit × 1 Accessory Pack × 1 AC Power Cord × 1 RJ-45 LAN Cable × 2
Optional Accessories
	DDR4 ECC SODIMM: 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 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2 / E10G30-T2 / E10G30-T1	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 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2 / E10G30-T2 / E10G30-T1
Notes	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.	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.

Storage Management
DSM Specifications	DS1825+	DS1825neo+
Maximum Single Volume Size	200 TB (32 GB memory required) 108 TB	200 TB (32 GB memory required) 108 TB
Maximum Internal Volume Number	32	32
M.2 SSD Storage Pool Support*
SSD Read/Write Cache (Determining cache size)
SSD TRIM
Storage Efficiency
Supported RAID Type	Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10	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	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	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10
Volume Expansion by Adding a HDD	Synology Hybrid RAID JBOD RAID 5 RAID 6	Synology Hybrid RAID JBOD RAID 5 RAID 6
Global Hot Spare Supported RAID Type	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10
Notes	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 .	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 .
File System
Internal Drives	Btrfs ext4	Btrfs ext4
External Drives	Btrfs ext4 ext3 FAT32 NTFS HFS+ exFAT	Btrfs ext4 ext3 FAT32 NTFS HFS+ exFAT
File Services
File Protocol	SMB AFP NFS FTP WebDAV Rsync	SMB AFP NFS FTP WebDAV Rsync
Maximum Number of SMB Connections (FSCT-Based)	60	60
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes	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	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
Account & Shared Folder
Maximum Local User Accounts	1,024	1,024
Maximum Local Groups	256	256
Maximum Shared Folder	256	256
Maximum Shared Folder Sync Tasks	8	8
Hybrid Share
Maximum Hybrid Share Folders	10	10
Hyper Backup
Folder and Package Backup
Entire System Backup
High Availability
Synology High Availability
Log Center
Syslog Events per Second	1,000	1,000
Virtualization
VMware vSphere	ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5	ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5
Microsoft Hyper-V	Windows Server 2025, Windows Server 2022	Windows Server 2025
Citrix XenServer	XenServer 8.4, XenServer 8, Citrix Hypervisor 8.2 LTSR CU1	XenServer 8.4, XenServer 8, Citrix Hypervisor 8.2 LTSR CU1
OpenStack	Cinder	Cinder
General Specifications
Supported 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 Safari	Chrome Firefox Edge Safari
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
Notes	For an updated list of supported browser versions, check the DSM Technical Specifications .	For an updated list of supported browser versions, check the DSM Technical Specifications .
Add-on Packages view the complete package list
Central Management System

Synology AI Console
Third-Party AI Model Integration
Maximum De-Identification Rate	60 words per second	60 words per second
Notes	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.	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.
Synology Chat
Maximum Number of Users	150	150
Notes	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.	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.
Download Station
Maximum Concurrent Download Tasks	80	80
SAN Manager
Maximum iSCSI Target Number	64	64
Maximum LUN	128	128
LUN Clone/Snapshot, Windows ODX
Synology MailPlus / MailPlus Server
Free Email Accounts	5 (Additional accounts require purchase of licenses)	5 (Additional accounts require purchase of licenses)
Maximum Number of Users	120	120
Notes	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).	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).
Media Server
DLNA Compliance
Synology Photos
Facial Recognition
Object Recognition
Snapshot Replication
Maximum Snapshots per Shared Folder	256	256
Maximum Snapshots per LUN	64	64
Maximum Snapshots per System	4,096	4,096
Maximum Replication Tasks for Shared Folders	32	32
Maximum Replication Tasks for LUNs	16	16
Maximum Replication Tasks per System	32	32
Surveillance Station
Default Licenses	2 (Additional cameras require purchase of licenses)	2 (Additional cameras require purchase of licenses)
Maximum IP Cameras and Total FPS (H.264)	1080p: 40 channels, 1050 FPS 3M: 40 channels, 600 FPS 5M: 40 channels, 440 FPS 4K: 32 channels, 320 FPS	1080p: 40 channels, 1050 FPS 3M: 40 channels, 600 FPS 5M: 40 channels, 440 FPS 4K: 32 channels, 320 FPS
Maximum IP Cameras and Total FPS (H.265)	1080p: 40 channels, 1200 FPS 3M: 40 channels, 1120 FPS 5M: 40 channels, 600 FPS 4K: 40 channels, 480 FPS	1080p: 40 channels, 1200 FPS 3M: 40 channels, 1120 FPS 5M: 40 channels, 600 FPS 4K: 40 channels, 480 FPS
Notes	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.	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.
Synology Drive
Maximum Number of Users	100	100
Maximum Number of Hosted Files	1,000,000 (applies to files indexed or hosted by Synology Drive . For file access through other standard protocols, refer to the File Services section above)	1,000,000 (applies to files indexed or hosted by Synology Drive . For file access through other standard protocols, refer to the File Services section above)
Notes	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 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.
Synology Office
Maximum Number of Users	100	100
Notes	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	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
Virtual Machine Manager
Recommended Virtual Machine Instances	8 (Learn more)	8 (Learn more)
Recommended Virtual DSM Number (Licenses required)	8 (including 1 Free License)	8 (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	8	8

Model Name		DS1825+	DS1825neo+
Expansion units	DX525	DX525
3.5" SATA HDD	Plus Series	HAT3300-4T HAT3300-6T HAT3320-8T HAT3310-12T HAT3310-16T HAT3320-20T	HAT3300-4T HAT3300-6T HAT3320-8T HAT3310-12T HAT3310-16T HAT3320-20T
Enterprise Series	HAT5320-4T HAT5320-8T HAT5300-12T HAT5310-16T HAT5310-20T HAT5320-24T	HAT5320-4T HAT5320-8T HAT5300-12T HAT5310-16T HAT5310-20T HAT5320-24T
2.5" SATA SSD	Enterprise Series	SAT5221-480G SAT5221-960G SAT5221-1920G SAT5221-3840G SAT5210-7000G	SAT5221-480G SAT5221-960G SAT5221-1920G SAT5221-3840G SAT5210-7000G
M.2 NVMe SSD	Enterprise Series	SNV3410-400G SNV5420-400G SNV5420-800G SNV5420-1600G	SNV3410-400G SNV5420-400G SNV5420-800G SNV5420-1600G
Add-in cards	E25G30-F2 E10G30-T2 E10G30-T1 E10G30-F2	E25G30-F2 E10G30-T2 E10G30-T1 E10G30-F2
Memory modules	D4ES03-8G D4ES03-16G	D4NS01-4G D4ES04-4G D4ES03-8G D4ES03-16G

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