• Features
  • Specs

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 When performance meets style DS620slim is a mini 6-bay NAS with a stylish chassis design, perfectly blending in modern workplaces or apartments. Supporting near-instantaneous snapshot technology, DS620slim is an all-around file management solution that fulfills professionals’ needs of advanced data protection. Download Datasheet CPU Dual-core 2GHz burst up to 2.5GHz  Memory DDR3L 2GB, up to 6GB Encryption Performance Over 226 MB/s reading and 198 MB/s writing Remain classic while shrinking footprint The mini 6-bay design keeps DS620slim classic and saves deployment space. With six 2.5" drive support, DS620slim is able to boost performance by installing SSDs. Compact Design Mini design with the dimensions of 121 x 151 x 175 mm, flexible to fit in anywhere RAID Flexibility Flexible in a variety of RAID configurations to realize maximum 30TB raw capacity or better data protection with RAID 5/6/10 Learn more SSD Cache Support Further enhance storage performance with SSD read/write cache while still having abundant drive bays for data storage

Btrfs: Next generation storage efficiency

The Btrfs file system introduces cutting-edge storage technologies and optimized snapshots to prevent data corruption and reduce maintenance overhead. While ensuring high-level data integrity, it also offers flexible, efficient data protection and recovery tools. Learn more

  • Flexible Shared Folder/User Quota System provides comprehensive quota control on all user accounts and shared folders
  • Snapshot Replication provides schedulable and storage capacity-saving data protection with 1,024 shared folder backups and 65,000 system-wide snapshots
  • File- or folder-level data restoration accelerates data recovery and provides more flexibility for businesses
  • Automatic file self-healing detects and recovers corrupted files without user intervention
Next-generation file system for better data protection

Ultimate file management and sharing

File Station is a web-based, fast and secure management tool built to allow easy, drag-and-drop operations without requiring any complex setup on Mac or PC. Advanced search and filtering tools allow for easy organization and file sharing. For complete compatibility, DS620slim supports the following protocols: AFP, FTP, iSCSI, NFS, SMB, and WebDAV.

Ultimate file management and sharing

Access and sync your files seamlessly

Synology Drive provides a built-in universal portal to access your data anytime and anywhere, and synchronize all your files across platforms, including Windows, macOS, Linux, Android, and iOS. Learn more

  • Sync files on demand: Save the storage space and network bandwidth of your PC.

  • Go back in time: Easily retrieve previous versions of your shared files.

  • Back up your data: Protect your files with scheduled backups or in real-time.

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Stream content to your TV Turn your Synology NAS into a home media hub and stream your digital contents to computers, mobile devices, Samsung TV, Apple TV, Google Chromecast, and DLNA devices.

Works best with Synology drives

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

SSD
Enterprise Series 2.5" SATA
Enterprise Series 2.5" SATA

Refurbished DS620slim

File Server/Management

Powerful built-in file management and sharing services.

Learn more

Snapshot Replication

Schedulable and instantaneous data protection of shared folders and iSCSI LUNs for quick disaster recovery.

Learn more

Multimedia

Complete multimedia solution for management, streaming, and playback.

Learn more

DSM UI

Award-winning operating system with an intuitive user interface and powerful capabilities.

Learn more

Security

Shield your Synology NAS from the most sophisticated threats with industry-leading security solutions.

Learn more

Public Cloud Integration

Back up and synchronize data easily between public cloud accounts and your NAS.

Learn more

Hardware Overview
  • 1 Status indicator
  • 2 Alert indicator
  • 3 Power button
  • 4 LAN indicator
  • 5 Drive status indicator
  • 6 Drive tray
  • 7 System fan
  • 8 Power port
  • 9 1GbE RJ-45 port
  • 10 Kensington Security Slot
  • 11 USB 3.0 port
  • 12 Reset button
  • First Product Image
  • Second Product Image
  • Third Product Image
  • Fourth Product Image
  • Fifth Product Image
  • Sixth Product Image
Hardware Specs Software Specs
Hardware Specifications
CPU
CPU
CPU Model Intel Celeron J3355
CPU Quantity 1
CPU Cores 2
CPU Threads 2
CPU Architecture 64-bit
CPU Frequency 2.0 (base) / 2.5 (turbo) GHz
Hardware Encryption Engine
Memory
Memory
System Memory 2 GB DDR3 non-ECC SODIMM
Total Memory Slots 2
Maximum Memory Capacity 6 GB (2 GB + 4 GB)
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.
Storage
Storage
Drive Bays 6
Drive Type (See all supported drives)
  • 2.5" SATA HDD
  • 2.5" SATA SSD
Hot Swappable Drive*
External Ports
External Ports
RJ-45 1GbE LAN Port 2
USB 3.2 Gen 1 Port 2
Appearance
Appearance
Size (Height x Width x Depth) 121 mm x 151 mm x 175 mm
Weight 1.4 kg
Others
Others
System Fan 80 mm x 80 mm x 1 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Easy Replacement System Fan
Brightness Adjustable Front LED Indicators
Power Recovery
Noise Level* 20.5 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 65 watts
AC Input Power Voltage 100V to 240V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption 34.88 watts (Access)
7.59 watts (HDD Hibernation)
British Thermal Unit 119.1 BTU/hr (Access)
25.92 BTU/hr (HDD Hibernation)
Notes
  • Power consumption is measured when it is fully loaded with Western Digital 1TB WD10JFCX hard drive(s).
  • Noise Level Testing Environment: Fully loaded with WD 1TB WD10JFCX 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: 17.2 dB(A); Temperature: 23.6˚C; Humidity: 58.2%.
Temperature
Temperature
Operating Temperature 5°C to 40°C (40°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
Certification
Certification
  • FCC
  • CE
  • BSMI
  • EAC
  • VCCI
  • RCM
Warranty
Warranty
2 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment
Environment
RoHS Compliant
Packaging Content
Packaging Content
  • Main Unit X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
  • Quick Installation Guide X 1
Optional Accessories
Optional Accessories
  • DDR3 non-ECC SODIMM: D3NS1866L-4G
  • Enterprise Series 2.5" SATA SSD: SAT5200 Series
Compatibility
Compatibility
Synology Compatibility List
DSM Specifications
Storage Management
Storage Management
Maximum Single Volume Size 108 TB
Maximum Internal Volume Number 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
RAID Migration
  • 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
Volume Expansion by Adding a HDD
  • 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
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.
File System
File System
Internal Drives
  • Btrfs
  • ext4
External Drives
  • Btrfs
  • ext4
  • ext3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
File Services
File Services
File Protocol
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
Maximum Number of SMB Connections (FSCT-Based) 5
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes
  • Connection value of this model is tested with Synology SATA SSD 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
Account & Shared Folder
Maximum Local User Accounts 512
Maximum Local Groups 128
Maximum Shared Folder 128
Maximum Shared Folder Sync Tasks 4
Hybrid Share
Hybrid Share
Maximum Hybrid Share Folders 10
Hyper Backup
Hyper Backup
Folder and Package Backup
Entire System Backup
Notes Full-system backup requires DSM 7.2 or later.
High Availability
High Availability
Synology High Availability
Log Center
Log Center
Syslog Events per Second 800
Virtualization
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
Microsoft Hyper-V Windows Server 2019, Windows Server 2016
Citrix XenServer XenServer 7
OpenStack Cinder
General Specifications
General Specifications
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 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
Notes For an updated list of supported browser versions, check the DSM Technical Specifications.
Add-on Packages view the complete package list
Central Management System
Central Management System
Synology AI Console
Synology AI Console
Third-Party AI Model Integration
Synology Chat
Synology Chat
Download Station
Download Station
Maximum Concurrent Download Tasks 80
SAN Manager
SAN Manager
Maximum iSCSI Target Number 2
Maximum LUN 4
LUN Clone/Snapshot, Windows ODX
Synology MailPlus / MailPlus Server
Synology MailPlus / MailPlus Server
Free Email Accounts 5 (Additional accounts require purchase of licenses)
Maximum Number of Users 10
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).
Media Server
Media Server
DLNA Compliance
Synology Photos
Synology Photos
Facial Recognition
Object Recognition
Notes Object recognition requires an upgrade of memory capacity to a minimum of 4 GB.
Snapshot Replication
Snapshot Replication
Maximum Snapshots per Shared Folder 128
Maximum Snapshots per LUN 32
Maximum Snapshots per System 1,024
Maximum Replication Tasks for Shared Folders 16
Maximum Replication Tasks for LUNs 8
Maximum Replication Tasks per System 16
Surveillance Station
Surveillance Station
Default Licenses 2 (Additional cameras require purchase of licenses)
Maximum IP Cameras and Total FPS (H.264)
  • 1080p: 25 channels, 600 FPS
  • 3M: 25 channels, 350 FPS
  • 5M: 25 channels, 250 FPS
  • 4K: 12 channels, 120 FPS
Maximum IP Cameras and Total FPS (H.265)
  • 1080p: 25 channels, 750 FPS
  • 3M: 25 channels, 450 FPS
  • 5M: 25 channels, 250 FPS
  • 4K: 20 channels, 200 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.
Synology Drive
Synology Drive
Maximum Number of Users 5
Maximum Number of Hosted Files 100,000 (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.
Synology Office
Synology Office
Maximum Number of Users 5
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
Virtual Machine Manager
Virtual Machine Manager
Recommended Virtual Machine Instances 2 (Learn more)
Recommended Virtual DSM Number (Licenses required) 2 (including 1 Free License)
Notes The specifications vary depending on system configuration and memory size.
VPN Server
VPN Server
Maximum Connections 4
Notes: Model specifications are subject to change without prior notice. The figures are based on Synology internal testing. Each performance test is done individually. No other services or applications are processed at the same time. The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations. If usage requirements exceed the specifications above, please contact our regional partners for professional advice.
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