Synology DiskStation DS1821+ Tower 8-Bay 3.5″ SATA HDD/SSD

CPU ModelAMD Ryzen V1500B CPU Quantity1 CPU Core4 CPU Architecture64-bit CPU Frequency2.2 GHz Hardware Encryption Engine

System Memory4 GB DDR4 ECC SODIMM Memory Module Pre-installed4 GB (4 GB x 1) Total Memory Slots2 Maximum Memory Capacity32 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 more information about the recommended memory configurations, please check the Hardware Installation Guide of your Synology product.

Drive Bays8 Maximum Drive Bays with Expansion Unit18 (DX517 x 2) M.2 Drive Slots2 (NVMe) Compatible Drive Type* (See all supported drives)

• 3.5″ SATA HDD
• 2.5″ SATA HDD
• 2.5″ SATA SSD
• M.2 2280 NVMe SSD

Hot Swappable Drive*  Notes

• The hot swappable drive feature is not supported by M.2 SSD slots.
• “Compatible drive type” indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.

RJ-45 1GbE LAN Port4 USB 3.2 Gen 1 Port*4 Expansion Port2 Expansion Port TypeeSATA NotesThe USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.

PCIe Expansion1 x Gen3 x8 slot (x4 link)

Size (Height x Width x Depth)166 mm x 343 mm x 243 mm Weight6 kg

System Fan120 mm x 120 mm x 2 pcs Fan Speed Mode

• Full-Speed Mode
• Cool Mode
• Quiet Mode

Easy Replacement System Fan  Brightness Adjustable Front LED Indicators  Power Recovery  Noise Level*22.2 dB(A) Scheduled Power On / Off  Wake on LAN / WAN  Power Supply Unit / Adapter250 watts AC Input Power Voltage100V to 240V AC Power Frequency50/60 Hz, Single Phase Power Consumption59.8 watts (Access)
26.18 watts (HDD Hibernation) British Thermal Unit204.05 BTU/hr (Access)
89.33 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%

Operating Temperature0°C to 40°C (32°F to 104°F) Storage Temperature-20°C to 60°C (-5°F to 140°F) Relative Humidity5% to 95% RH

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

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.

RoHS Compliant

• Main Unit X 1
• Accessory Pack X 1
• AC Power Cord X 1
• RJ-45 LAN Cable X 2
• Quick Installation Guide X 1

• DDR4 ECC SODIMM: D4ES01-4G/D4ES01-8G/D4ECSO-2666-16G
• Expansion Units: DX517
• 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 Series
• 25GbE Network Interface Card: E25G30-F2
• 10GbE Network Interface Card: E10G30-F2/E10G30-T2/E10G18-T1

NotesAll memory modules will operate at the maximum frequency specified by the CPU manufacturer.