SYNOLOGY DiskStation DS1525+ 5-BAY Network Attached Storage

CPU Model

AMD Ryzen V1500B

CPU Quantity

1

CPU Cores

4

CPU Architecture

64-bit

CPU Frequency

2.2 GHz

Hardware Encryption Engine

Yes

System Memory

8 GB DDR4 ECC SODIMM

Total Memory Slots

2

Maximum Memory Capacity

32 GB (16 GB × 2)

Memory Notes

Synology may revise pre-installed memory module specifications due to component lifecycle and supply conditions. Revised components undergo the same validation for compatibility, stability, and performance.

For optimum compatibility and reliability, use Synology memory modules only. Synology does not provide full warranty or technical support for non-Synology memory modules.

For multi-module configurations, all modules must be identical and share the same model number. Refer to the Product Manual for recommended configurations.

Drive Bays

5

Maximum Drive Bays (with Expansion Unit)

15 (DX525 × 2)

M.2 Drive Slots

2 (NVMe)

Supported Drive Types

3.5" SATA HDD
2.5" SATA SSD
M.2 2280 NVMe SSD

Hot Swappable Drives

Yes (Not supported for M.2 SSD slots)

Storage Notes

Full functionality, reliability, and performance are guaranteed only for compatible drives. Consult the compatibility list before purchasing.

RJ-45 2.5GbE LAN Ports

2

USB 3.2 Gen 1 Ports

2

Expansion Ports

2

Expansion Port Type

USB Type-C

PCIe Expansion

1 × Gen3 x2 network upgrade slot

Dimensions (H × W × D)

166 mm × 230 mm × 223 mm

Weight

2.67 kg

System Fans

92 mm × 92 mm × 2 pcs

Fan Speed Modes

Full-Speed Mode
Cool Mode
Quiet Mode

Front LED Indicators

Brightness adjustable

Power Recovery

Supported

Noise Level

22.60 dB(A)

Scheduled Power On / Off

Supported

Wake on LAN / WAN

Supported

Power Supply Unit

120 watts

AC Input Voltage

100V to 240V AC

Power Frequency

50 / 60 Hz, Single Phase

Power Consumption

44.56 W (Access)
13.63 W (HDD Hibernation)

British Thermal Unit

151.95 BTU/hr (Access)
46.48 BTU/hr (HDD Hibernation)

Power & Noise Notes

Power consumption measured per Synology methodology.

Noise testing conducted with Synology SATA HDDs installed and system idle. Two G.R.A.S. Type 40AE microphones placed 1 m from front and rear. Background noise: 16.49–17.51 dB(A); Temperature: 24.25–25.75 °C; Humidity: 58.2–61.8%.

Operating Temperature

0 °C to 40 °C (32 °F to 104 °F)

Storage Temperature

−20 °C to 60 °C (−5 °F to 140 °F)

Operating Humidity

8% to 80% RH

Storage Humidity

5% to 95% RH

Certifications

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

Environmental Compliance

RoHS Compliant

Packaging Contents

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

Optional Accessories

DDR4 ECC SODIMM: D4ES03-8G / D4ES03-16G
Expansion Units: DX525
Enterprise 3.5" SATA HDD: HAT5300 Series
Plus 3.5" SATA HDD: HAT3300 Series
Enterprise 2.5" SATA SSD: SAT5200 Series
Enterprise M.2 2280 NVMe SSD: SNV3400 & SNV5400 Series
10GbE Network Upgrade Module: E10G22-T1-Mini

Maximum Single Volume Size

200 TB (requires 32 GB memory)
108 TB

Maximum Internal Volume Number

32

M.2 SSD Storage Pool Support

Supported*

SSD Read / Write Cache

Supported

SSD TRIM

Supported

Supported RAID Types

Synology Hybrid RAID
Basic
JBOD
RAID 0
RAID 1
RAID 5
RAID 6
RAID 10

RAID Migration

Basic → RAID 1
Basic → RAID 5
RAID 1 → RAID 5
RAID 5 → RAID 6

Volume Expansion with Larger HDDs

Synology Hybrid RAID
RAID 1
RAID 5
RAID 6
RAID 10

Volume Expansion by Adding HDD

Synology Hybrid RAID
JBOD
RAID 5
RAID 6

Global Hot Spare Supported RAID Types

Synology Hybrid RAID
RAID 1
RAID 5
RAID 6
RAID 10

Storage Notes

Volumes over 108 TB require 32 GB memory or more.

Actual maximum volume and storage pool sizes depend on drive size, number of bays, and RAID configuration.

Usable capacity is lower due to filesystem and metadata overhead.

M.2 storage pools require Synology-verified SSDs, tested under extreme thermal conditions.

Internal Drive File Systems

Btrfs
ext4

External Drive File Systems

Btrfs
ext4
ext3
FAT32
NTFS
HFS+
exFAT

File Protocols

SMB
AFP
NFS
FTP
WebDAV
Rsync

Maximum SMB Connections (FSCT-Based)

40

Windows ACL Integration

Supported

NFS Kerberos Authentication

Supported

File Services Notes

Tested with Synology SATA HDDs fully populated and maximum supported memory installed.

SMB performance tested using Microsoft FSCT v1.3 (HomeFolder workload, 600s duration, Windows Server 2022, 8 Windows 10 clients).

Maximum Local User Accounts

1,024

Maximum Local Groups

256

Maximum Shared Folders

256

Maximum Shared Folder Sync Tasks

8

Maximum Hybrid Share Folders

10

Hyper Backup

Folder & Package Backup
Entire System Backup

Synology High Availability

Supported

Syslog Events per Second

800

VMware vSphere Support

ESXi 8.0 U2, U1, 8.0
ESXi 7.0 U3, U2, U1, 7.0
ESXi 6.7 U3, U2, U1, 6.7
ESXi 6.5 U3, U2, U1, 6.5

Microsoft Hyper-V

Windows Server 2022

Citrix XenServer

XenServer 8, Citrix Hypervisor 8.2 LTSR CU1

OpenStack

Cinder

Supported Protocols

SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPS, FTP, SNMP, LDAP, CalDAV

Supported Browsers

Chrome
Firefox
Edge
Safari

Supported Languages

English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português (BR & EU), Türkçe, Český, ไทย, 日本語, 한국어, 繁體中文, 简体中文

Central Management System

Supported

Synology AI Console

Supported

Third-Party AI Model Integration

Supported

Maximum De-Identification Rate

40 words per second

AI Notes

Tested using filters for credit card numbers, IBAN, ITIN, SSN, and names on a 4,355-word English text.
Requires at least 8 GB memory and Container Manager.

Synology Chat – Max Users

150

Chat Notes

Tested with simulated users averaging 20,000 messages. Required response time under 10 seconds.

Maximum Concurrent Download Tasks

80

Maximum iSCSI Targets

64

Maximum LUNs

128

LUN Clone / Snapshot, Windows ODX

Supported

MailPlus Free Accounts

5 (licenses required for more)

MailPlus Maximum Users

100

MailPlus Notes

Based on mixed workload with SSD support, maximum memory installed, and all security features enabled. High-availability mode incurs additional overhead.

Media Server (DLNA)

Supported

Synology Photos

Facial Recognition
Object Recognition

Max Snapshots per Shared Folder

256

Max Snapshots per LUN

64

Max Snapshots per System

4,096

Max Replication Tasks (Shared Folders)

32

Max Replication Tasks (LUNs)

16

Max Replication Tasks per System

32

Surveillance Station Default Licenses

2

Max Cameras & FPS (H.264)

1080p: 40 ch / 1050 FPS
3M: 40 ch / 600 FPS
5M: 30 ch / 360 FPS
4K: 20 ch / 200 FPS

Max Cameras & FPS (H.265)

1080p: 40 ch / 1200 FPS
3M: 40 ch / 1000 FPS
5M: 40 ch / 600 FPS
4K: 30 ch / 300 FPS

Surveillance Notes

Performance tested with full drive population and default memory under continuous recording. Actual results vary by workload and configuration.

Synology Drive – Max Users

80

Maximum Hosted Files

500,000

Drive Notes

Based on mixed active/idle workload. Exceeding recommendations may increase response time.

Synology Office – Max Users

80

Office Notes

Tested with SSD support, max memory installed, and client PCs using Intel Core i3-3220 / 8 GB RAM.

Recommended Virtual Machine Instances

8

Recommended Virtual DSMs

8 (includes 1 free license)

Virtualization Notes

Actual limits depend on system configuration and memory size.

VPN Server – Maximum Connections

8