Synology DS1821+

Product Code

DS1821+

CPU Model

AMD Ryzen V1500B

CPU Quantity

1

CPU Architecture

64-bit

CPU Frequency

4-core 2.2 GHz

Hardware Encryption Engine (AES-NI)

√

System Memory

4 GB DDR4 ECC SODIMM

Memory Module Pre-installed

4 GB (4 GB x 1)

Total Memory Slots

2

Maximum Memory Capacity

32 GB (16 GB x 2)

Drive Bays

8

Maximum Drive Bays with Expansion Unit

18 (DX517 x 2)

M.2 Drive Slots

2 (NVMe)

RJ-45 1GbE LAN Port

4 (with Link Aggregation / Failover support)

USB 3.2 Gen 1 Port*

4

eSATA Port

2

Product Code

DS1520+

DS1621+

DS1821+

CPU Model

Intel Celeron J4125

AMD Ryzen V1500B

AMD Ryzen V1500B

CPU Quantity

1

1

1

CPU Architecture

64-bit

64-bit

64-bit

CPU Frequency

4-core 2.0 (base) / 2.7 (burst) GHz

4-core 2.2 GHz

4-core 2.2 GHz

Hardware Encryption Engine (AES-NI)

√

√

√

System Memory

8 GB DDR4 non-ECC

4 GB DDR4 ECC SODIMM

4 GB DDR4 ECC SODIMM

Memory Module Pre-installed

8 GB (4 GB + 4 GB)

4 GB (4 GB x 1)

4 GB (4 GB x 1)

Total Memory Slots

1

2

2

Maximum Memory Capacity

-

32 GB (16 GB x 2)

32 GB (16 GB x 2)

Drive Bays

5

6

8

Maximum Drive Bays with Expansion Unit

15 (DX517 x 2)

16 (DX517 x 2)

18 (DX517 x 2)

RJ-45 1GbE LAN Port

4 (with Link Aggregation / Failover support)

4 (with Link Aggregation / Failover support)

4 (with Link Aggregation / Failover support)

USB 3.2 Gen 1 Port*

2

3

4

eSATA Port

2

2

2

Size (Height x Width x Depth)

166 mm x 230 mm x 223 mm

166 mm x 282 mm x 243 mm

166 mm x 343 mm x 243 mm

Weight

2.62 kg

5.1 kg

6 kg

DS1821+ Specification

CPU

CPU Model

AMD Ryzen V1500B

CPU Quantity

1

CPU Architecture

64-bit

CPU Frequency

4-core 2.2 GHz

Hardware Encryption Engine (AES-NI)

√

Memory

System Memory

4 GB DDR4 ECC SODIMM

Memory Module Pre-installed

4 GB (4 GB x 1)

Total Memory Slots

2

Maximum Memory Capacity

32 GB (16 GB x 2)

Notes

* 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.

* 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.

Storage

Drive Bays

8

Maximum Drive Bays with Expansion Unit

18 (DX517 x 2)

M.2 Drive Slots

2 (NVMe)

Compatible Drive Type*

3.5" SATA HDD

2.5" SATA HDD

2.5" SATA SSD

M.2 2280 NVMe SSD

Maximum Single Volume Size*

108 TB

Hot Swappable Drive

√

Notes

* "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.

* Each internal volume (may consist of multiple drives) is expandable up to 108TB.

External Ports

RJ-45 1GbE LAN Port

4 (with Link Aggregation / Failover support)

USB 3.2 Gen 1 Port*

4

eSATA Port

2

Notes

The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.

PCIe

PCIe Expansion

1 x Gen3 x8 slot (x4 link)

File System

Internal Drives

Btrfs

EXT4

External Drives

Btrfs

EXT4

EXT3

FAT

NTFS

HFS+

exFAT

Appearance

Size (Height x Width x Depth)

166 mm x 343 mm x 243 mm

Weight

6 kg

Others

System Fan

120 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 / Adapter

250 W

AC Input Power Voltage

100 V to 240 V AC

Power Frequency

50/60 Hz, Single Phase

Power Consumption*

59.8 W (Access)

26.18 W (HDD Hibernation)

British Thermal Unit

204.05 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%

Temperature

Operating Temperature

0°C to 40°C (32°F to 104°F)

Storage Temperature

-20°C to 60°C (-5°F to 140°F)

Relative Humidity

5% to 95% RH

Certification

FCC

CE

BSMI

EAC

CCC

KC

VCCI

RCM

Warranty

3 Years

Notes: The warranty period starts from the purchase date as stated on your purchase receipt.

Environment

RoHS Compliant

Packaging Content

Main Unit X 1

Accessory Pack X 1

AC Power Cord X 1

RJ-45 LAN Cable X 2

Quick Installation Guide X 1