Synology Inc.

Refurbished RackStation RS2421RP+/RS2421+

Secure storage for centralized data management

Synology Certified Refurbished

Access Synology solutions in a cost-effective and environmentally responsible way. All certified refurbished products are put through extensive testing, comply with stringent quality standards, and come with a 2-year warranty.

More about Synology Certified Refurbished

Secure storage for your business

Synology RS2421+/RS2421RP+ are versatile 2U 12-bay storage servers designed to accommodate a diverse set of business environments. Scalable up to 24 drives, they are designed for cost-effective file management and sharing and include powerful backup capabilities designed for businesses with a growing data footprint. The unit delivers 2,200 MB/s 64K sequential read and 1,154 MB/s sequential write performance, and can be optionally enhanced with SSD cache and 10/25Gb Ethernet.

Download Datasheet

ComputeAMD Ryzen^™ V1500B quad-core 2.2 GHz

Throughput2,200 MB/s seq. read and 1,154 MB/s seq. write performance

Memory4 GB ECC DDR4, up to 32 GB

ScalabilityUp to 24 drive bays with RX1217(RP)

Built for reliability

Redundant power

Reduce the possibility of power disruptions on a single distribution channel or PDU adversely impacting data and service availability.

Near-zero downtime

Pair two identical devices with Synology High Availability and enable automatic minute-level failover between both devices in the event one server fails. Learn more

Data integrity and protection

ECC memory brings higher system reliability, while the Btrfs file system helps prevent data corruption, supports snapshot technology, and simplifies data protection. Learn more

Customize to suit

Easily adapt the RS2421+/RS2421RP+ to any business environment by adding faster networking, local SSD cache, or storage capacity.

10/25GbE ready

Support for 10/25GbE NICs lets you boost maximum network throughput using Link Aggregation (bonding).

SSD cache

Boost read/write IOPS over HDD-only arrays by up to 16 times or more with NVMe or SATA SSD Cache

Storage expansion

Expand to 24 drive bays with a RX1217(RP) expansion unit

License-free backup solutions

Back up your NAS to other devices

Hyper Backup

Back up files, iSCSI LUNs, installed applications, and system configurations to destinations including Synology C2 Storage, public cloud platforms, USB devices, file servers, local folders, or other Synology NAS. Set and forget backup tasks with regular schedules, enhance security with fine-grained user permissions and encryption, keep backup sizes small with built-in deduplication, and restore data flexibly with multi-versioning. Learn more

Snapshot Replication

Snapshot Replication enables flexible point-in-time snapshots of shared folders and virtual machines with an RPO as low as 5 minutes and recovery within seconds. Learn more

Active Backup Suite

Securely back up Windows clients and servers, Microsoft 365 and Google Workspace accounts, file servers, and VMware and Hyper-V virtual machines with the Active Backup Suite. Leverage built-in deduplication technology to reduce backup sizes and multi-versioning to allow flexible restoration. Learn more

Serving remote workforces

Keep your remote workforce connected with powerful out-of-the-box solutions for collaboration, file sharing, and communication.

Synology Drive

Host your own private cloud behind the safety of your NAS with 100% data ownership and no subscription fees. Learn more

Synology Office

Create documents, spreadsheets, and slides in a multi-user environment. Real-time collaboration and automatic saving make remote work sessions a breeze. Learn more

Synology Chat

Discuss and collaborate with colleagues using secure messaging designed for teams, with mobile, desktop, and browser clients. Learn more

Works best with Synology drives

Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.

HDD

Enterprise Series 3.5" SATA

Plus Series 3.5" SATA

SSD

Enterprise Series 2.5" SATA

Enterprise Series M.2 NVMe

Powered by Synology DiskStation Manager

The web-based DiskStation Manager (DSM) operating system supports a host of native productivity and management solutions.

Central Management System

Conveniently manage your fleet of Synology NAS from a centralized console.

Learn more

Synology Drive

Instantly access your NAS files across multiple devices whenever you want, wherever you are.

Learn more

Collaboration Suite

Satisfy all team collaboration needs behind the safety of your own private cloud with Synology Office, Calendar, and Chat.

Learn more

Virtual Machine Manager

Run various operating systems in isolated sandboxes. Seamlessly clone, store, and migrate virtual machines.

Learn more

Security

Secure data with comprehensive built-in security tools to protect your devices against evolving threats.

Learn more

Surveillance Station

Complete surveillance solution for recording, monitoring, and management.

Learn more

Hardware Overview

RS2421RP+

RS2421+

1Power button and indicator
2Status Indicator
3Alert Indicator
4Alert Off Button
5Drive tray

6Drive status indicator
7Rail Kit Release Tab
8Power Port
9PSU Indicators & Alert Off Buttons
10PSU fan

11PSU on/off switch
12Console port
131GbE RJ-45 port
14USB 3.2 Ports
15Expansion port

16Reset button
17PCIe expansion slot

1Power button and indicator
2Status Indicator
3Alert Indicator
4Alert Off Button
5Drive tray

6Drive status indicator
7Rail Kit Release Tab
8Power Port
9PSU Indicators & Alert Off Buttons (RS2421RP+)
10PSU fan

11PSU on/off switch
12Console port
131GbE RJ-45 port
14USB 3.2 Ports
15Expansion port

16Reset button
17PCIe expansion slot

Notes:Network adapter cards, expansion units, other PCIe add-in cards, and storage drives are sold separately. Refer to thecompatibility list for compatible devices.Redundant power only available in the RS2421RP+ model.SSD cache can be enabled by using compatible 2.5" SSDs in drive bays or without occupying drive bays by installing Synology SNV3500 M.2 22110 NVMe SSDs using M2D20 or E10M20-T1 adapter cards, sold separately. The RS2421(RP)+ does not support SNV3400 NVMe SSDs.Users have reported total data size reductions of more than 50% when backing up multiple systems with deduplication technology enabled.

Hardware Specs

Hardware Specifications	Refurbished RS2421RP+	Refurbished RS2421+
CPU
CPU Model	AMD Ryzen V1500B	AMD Ryzen V1500B
CPU Quantity	1	1
CPU Core	4	4
CPU Architecture	64-bit	64-bit
CPU Frequency	2.2 GHz	2.2 GHz
Hardware Encryption Engine
Memory
System Memory	4 GB DDR4 ECC UDIMM	4 GB DDR4 ECC UDIMM
Memory Module Pre-installed	4 GB (4 GB x 1)	4 GB (4 GB x 1)
Total Memory Slots	2	2
Maximum Memory Capacity	32 GB (16 GB x 2)	32 GB (16 GB x 2)
Notes	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. 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 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. 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	12	12
Maximum Drive Bays with Expansion Unit	24 (RX1217 x 1)	24 (RX1217 x 1)
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
Hot Swappable Drive*
Notes	Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.	Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
External Ports
RJ-45 1GbE LAN Port	4	4
USB 3.2 Gen 1 Port	2	2
Expansion Port	1	1
Expansion Port Type	Infiniband	Infiniband
PCIe
PCIe Expansion	1 x Gen3 x8 slot (x4 link)	1 x Gen3 x8 slot (x4 link)
Appearance
Form Factor (RU)	2U	2U
Size (Height x Width x Depth)	88 mm x 482 mm x 578 mm	88 mm x 482 mm x 552 mm
Weight	11.9 kg	11.5 kg
Rack Installation Support*	4-post 19" rack (Synology Rail Kit - RKS-02)	4-post 19" rack (Synology Rail Kit - RKS-02)
Notes	The rail kit is sold separately	The rail kit is sold separately
Others
System Fan	60 mm x 60 mm x 3 pcs	60 mm x 60 mm x 3 pcs
Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode	Full-Speed Mode Cool Mode Quiet Mode
Easy Replacement System Fan
Power Recovery
Noise Level*	54 dB(A)	50.1 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter	350 watts	500 watts
Redundant Power Supply		-
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*	91.76 watts (Access) 48.21 watts (HDD Hibernation)	79.56 watts (Access) 34.89 watts (HDD Hibernation)
British Thermal Unit	313.31 BTU/hr (Access) 164.61 BTU/hr (HDD Hibernation)	271.65 BTU/hr (Access) 119.13 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 35°C (32°F to 95°F)	0°C to 35°C (32°F to 95°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 EAC CCC KC BIS UL VCCI RCM	FCC CE BSMI EAC CCC KC BIS UL VCCI RCM
Warranty
	2 Years	2 Years
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 Cord X 2 Quick Installation Guide X 1	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 Quick Installation Guide X 1
Optional Accessories
	DDR4 ECC UDIMM: D4EU01-4G/D4EC-2666-8G/D4EC-2666-16G Expansion Units: RX1217/RX1217RP Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2/E10G30-T2/E10G18-T1 Rail Kit Sliding: RKS-02	DDR4 ECC UDIMM: D4EU01-4G/D4EC-2666-8G/D4EC-2666-16G Expansion Units: RX1217/RX1217RP Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2/E10G30-T2/E10G18-T1 Rail Kit Sliding: RKS-02
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	Refurbished RS2421RP+	Refurbished RS2421+
Storage Management
Maximum Single Volume Size	108 TB	108 TB
Maximum Internal Volume Number	64	64
SSD Read/Write Cache (Determining cache size)
SSD TRIM
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	Each internal volume (may consist of multiple drives) is expandable up to 108TB. 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.	Each internal volume (may consist of multiple drives) is expandable up to 108TB. 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.
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 Concurrent SMB/AFP/FTP Connections	1,000	1,000
Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion)	2,000	2,000
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes	During testing, the maximum number of SSDs supported by this model is installed in a RAID 5 configuration. Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM. The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.	During testing, the maximum number of SSDs supported by this model is installed in a RAID 5 configuration. Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM. The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
Account & Shared Folder
Maximum Local User Accounts	2,048	2,048
Maximum Local Groups	256	256
Maximum Shared Folder	512	512
Maximum Shared Folder Sync Tasks	16	16
Hybrid Share
Hybrid Share Folder Number	10	10
Hyper Backup
Data & Folder Backup
Entire System Backup
Notes	Full-system backup requires DSM 7.2 or later.	Full-system backup requires DSM 7.2 or later.
High Availability
Synology High Availability
Log Center

Syslog Events per Second	1,000	1,000
Virtualization
VMware ESXi 6.5 and VAAI
Windows Server 2022
Citrix Ready
OpenStack
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 Chat

Suggested Users	1,500	1,500
Suggested 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	128	128
Maximum LUN	256	256
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)
Suggested Maximum Users	150	150
Notes	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). Models with more than 4 bays were installed with two SSDs for SSD cache.	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). Models with more than 4 bays were installed with two SSDs for SSD cache.
Media Server

DLNA Compliance
Synology Photos

Facial Recognition
Object Recognition
Snapshot Replication

Maximum Snapshots per Shared Folder	1,024	1,024
Maximum of System Snapshots	65,536	65,536
Surveillance Station

Default Licenses	2 (Additional cameras require purchase of licenses)	2 (Additional cameras require purchase of licenses)
Suggested 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
Suggested 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 streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time.	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 streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time.
Synology Drive

Recommended Number of Concurrent Sync Clients	550	550
Maximum Number of Hosted Files	50,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)	50,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Notes	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.	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

Suggested Users	1,800	1,800
Notes	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	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	40	40

Hardware Specs

Hardware Specifications		Refurbished RS2421RP+	Refurbished RS2421+
CPU	CPU Model	AMD Ryzen V1500B	AMD Ryzen V1500B
	CPU Quantity	1	1
	CPU Core	4	4
	CPU Architecture	64-bit	64-bit
	CPU Frequency	2.2 GHz	2.2 GHz
	Hardware Encryption Engine
Memory	System Memory	4 GB DDR4 ECC UDIMM	4 GB DDR4 ECC UDIMM
	Memory Module Pre-installed	4 GB (4 GB x 1)	4 GB (4 GB x 1)
	Total Memory Slots	2	2
	Maximum Memory Capacity	32 GB (16 GB x 2)	32 GB (16 GB x 2)
	Notes	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. 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	12	12
	Maximum Drive Bays with Expansion Unit	24 (RX1217 x 1)	24 (RX1217 x 1)
	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
	Hot Swappable Drive*
	Notes	Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
External Ports	RJ-45 1GbE LAN Port	4	4
	USB 3.2 Gen 1 Port	2	2
	Expansion Port	1	1
	Expansion Port Type	Infiniband	Infiniband
PCIe	PCIe Expansion	1 x Gen3 x8 slot (x4 link)	1 x Gen3 x8 slot (x4 link)
Appearance	Form Factor (RU)	2U	2U
	Size (Height x Width x Depth)	88 mm x 482 mm x 578 mm	88 mm x 482 mm x 552 mm
	Weight	11.9 kg	11.5 kg
	Rack Installation Support*	4-post 19" rack (Synology Rail Kit - RKS-02)	4-post 19" rack (Synology Rail Kit - RKS-02)
	Notes	The rail kit is sold separately
Others	System Fan	60 mm x 60 mm x 3 pcs	60 mm x 60 mm x 3 pcs
	Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode	Full-Speed Mode Cool Mode Quiet Mode
	Easy Replacement System Fan
	Power Recovery
	Noise Level*	54 dB(A)	50.1 dB(A)
	Scheduled Power On / Off
	Wake on LAN / WAN
	Power Supply Unit / Adapter	350 watts	500 watts
	Redundant Power Supply		-
	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*	91.76 watts (Access) 48.21 watts (HDD Hibernation)	79.56 watts (Access) 34.89 watts (HDD Hibernation)
	British Thermal Unit	313.31 BTU/hr (Access) 164.61 BTU/hr (HDD Hibernation)	271.65 BTU/hr (Access) 119.13 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%
Temperature	Operating Temperature	0°C to 35°C (32°F to 95°F)	0°C to 35°C (32°F to 95°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 EAC CCC KC BIS UL VCCI RCM	FCC CE BSMI EAC CCC KC BIS UL VCCI RCM
Warranty		2 Years	2 Years
Warranty	Notes	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 Cord X 2 Quick Installation Guide X 1	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 Quick Installation Guide X 1
Optional Accessories		DDR4 ECC UDIMM: D4EU01-4G/D4EC-2666-8G/D4EC-2666-16G Expansion Units: RX1217/RX1217RP Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2/E10G30-T2/E10G18-T1 Rail Kit Sliding: RKS-02	DDR4 ECC UDIMM: D4EU01-4G/D4EC-2666-8G/D4EC-2666-16G Expansion Units: RX1217/RX1217RP Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2/E10G30-T2/E10G18-T1 Rail Kit Sliding: RKS-02
Optional Accessories	Notes	All memory modules will operate at the maximum frequency specified by the CPU manufacturer.