NAS Buffalo TeraStation WS5420DN08S9 Data Recovery: Thorough Step-by-Step RAID Array Guide

Has your NAS Buffalo TeraStation WS5420DN08S9 suddenly lost its network drive and you’re unsure what to do next? Did the RAID array collapse, making your files inaccessible? Is the device throwing errors during startup? Perhaps you accidentally rebuilt the RAID array or several hard drives failed at the same time?

NAS Buffalo TeraStation WS5420DN08S9 Data Recovery: Thorough Step-by-Step RAID Array Guide
Data Recovery Tool

Buffalo TeraStation WS5420DN08S9 NAS Data Recovery in 2025

In this step-by-step tutorial, we’ll show you how to rebuild your RAID and recover data from an TeraStation WS5420DN08S9. We’ll walk through the most common causes of failure and demonstrate proven methods to restore files from a lost or degraded RAID array.

NAS Buffalo TeraStation WS5420DN08S9 Data Recovery: Thorough Step-by-Step RAID Array Guide

RAID Recovery™ 2.8
Recover data from damaged RAID arrays inaccessible from a computer.
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Why Regular Data Recovery Tools Can’t Restore Files from RAID

Conventional hard drives store user data by writing it sequentially across the disk surface, which means an entire file is typically located on a single drive. In contrast, when data is written to a RAID array, each file is split into multiple fragments. These fragments are then distributed and written in sequence across all the drives in the array. Depending on the configuration, fragment sizes can range from 2 KB to 2 MB, so every file is physically stored across several disks at once.

This approach significantly increases read and write performance — after all, writing two halves of a 1 GB file to two drives simultaneously is much faster than writing the full 1 GB to a single disk. However, this same mechanism makes file recovery far more complex.

Different RAID levels use different methods to distribute and protect data. On top of that, manufacturers like Buffalo often add their own proprietary structures and variations. As a result, data can be written to disks in many different formats, and each requires a specific approach during recovery.

Can improper network configuration or firewall settings result in data loss on NAS Buffalo TeraStation WS5420DN08S9 devices?

Yes, improper network configuration or firewall settings can potentially result in data loss on NAS Buffalo TeraStation WS5420DN08S9 devices.

If the network configuration is not properly set up, it can lead to connectivity issues between the NAS device and other devices on the network. This can result in data transfer errors or interruptions, leading to potential data loss.

Similarly, if the firewall settings are not correctly configured, it can block necessary network traffic between the NAS device and other devices. This can prevent data from being accessed or transferred properly, potentially causing data loss.

It is important to ensure that the network configuration and firewall settings are properly configured to allow proper communication and data transfer between the NAS device and other devices on the network to avoid any potential data loss.

How to Remove Hard Disks from Your NAS and Connect Them to a PC

Although the NAS TeraStation WS5420DN08S9 can be accessed over the network, you still need to remove its hard disks and connect them directly to a Windows PC. Only then can the recovery software properly scan and analyze the drives. Follow these steps:

  1. Power off the NAS and disconnect it from the power source.

    WARNING! Before removing any drives, carefully read the device manual. Improper actions may damage both the NAS enclosure and the hard disks in the RAID array.

  2. Remove the hard disks one by one, gently sliding each drive out of its slot. Remember that hard disks are highly sensitive: any impact or drop can cause serious physical damage.

  3. Label each hard disk according to its position inside the NAS. The order of the drives is crucial for correct RAID reconstruction.

  4. Connect the drives to your computer. In this video, we explain which ports you can use to connect hard disks and what to do if your PC does not have enough free connectors.

    Go to view
    How to Order Remote Data Recovery

    How to Order Remote Data Recovery

Step-by-Step Data Recovery with Hetman RAID Recovery

Hetman Raid Recovery

This program restores data from damaged RAID arrays and is fully compatible with Buffalo TeraStation WS5420DN08S9. Each hard disk in the array contains technical metadata describing how files were written. When launched, Hetman RAID Recovery analyzes this metadata, automatically reconstructs the damaged array, and provides access to its contents. After that, you can browse the recovered disk and save your files. The program can also restore files that were accidentally deleted from the network drive.

Go to view
How to recover data from a Buffalo

How to recover data from a Buffalo

TeraStation WS5420DN08S9 has 4 HDD slots, and it supports the following array types:

  • RAID 0;
  • RAID 1;
  • RAID 5;
  • RAID 6;
  • JBOD;

NAS supports:

  • exFAT, VFAT, FAT 12 / 16 / 32;
  • NTFS / ReFS;
  • APFS / HFS+;
  • Ext2 / 3 / 4 / ReiserFS / XFS / UFS / ZFS / Btrfs;
  • VMFS / HikvisionFS;

How to Safely Recover Data from Disk Images

This utility allows you to create a complete copy of a disk and work with the disk image instead of the physical drive. This approach helps protect your data from:

  • Overwriting during the recovery process;
  • Additional data loss caused by bad sectors;
  • User errors.

To create a disk image, follow these steps:

  1. Ensure you have enough free space to store the image. Its size will typically match the size of the original disk.

  2. In the main window, select the target disk and choose Tools - Save Disk. You can also select multiple disks if needed.

  3. When the Image Creation Wizard opens, select whether you want to save the entire disk or only a specific region. Adjust the settings and click Next.

    Hetman RAID Recovery: Image Creation Wizard

  4. Choose the directory where the image will be saved. You may select any available disk connected to your PC or upload the image via FTP.

    Hetman RAID Recovery: Choose a disk or save the image via FTP

Where Are the User’s Files Actually Stored?

The Buffalo TeraStation WS5420DN08S9 network-attached storage keeps Windows Storage Server operating system files on a separate RAID 1 (mirrored) array. Usually, all NAS systems create several volumes on every hard disk, and the first of them takes up to 2 Gb of space. This is where operating system files are stored. Other volumes are united into a RAID array where user’s data is written.

RAID Recovery Software: Detailed Comparison

Product Operating system RAID controller support Supported file systems Virtual RAID controller support Data recovery from damaged RAID File preview
Hetman RAID Recovery Windows, Linux, MacOS Yes, over 100 controllers FAT, exFAT, NTFS, ReFS, APFS, HFS+, Ext4, Ext3, Ext2, ReiserFS, Btrfs, VMFS, Hikvision, XFS, UFS, ZFS Yes Yes Yes
DiskInternals RAID Recovery Windows Yes, over 10 controllers FAT, NTFS, Ext2/3/4, HFS+ No Yes Yes
R-Studio Windows, Mac, Linux Yes, over 20 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes
UFS Explorer RAID Recovery Windows, Mac, Linux Yes, over 100 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes
EaseUS Data Recovery Windows Yes, over 20 controllers FAT, NTFS, Ext2/3/4, HFS+ No Yes Yes
ReclaiMe Free RAID Recovery Windows Yes, over 100 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes

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Comments (3)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 9.08.2022 12:31 #
    If you want to ask a question about data recovery, from NAS TeraStation WS5420DN08S9, feel free to leave a comment!
    Reply
  • Jaxon Strefling
    Jaxon Strefling 1.09.2023 00:46 #
    Can data recovery from a NAS Buffalo TeraStation WS5420DN08S9 device be done if the storage disks are not recognized by the device?
    Reply
    • Hetman Software
      Hetman Software 1.09.2023 02:00 #

      If the storage disks in your NAS Buffalo TeraStation WS5420DN08S9 are not recognized by the device, data recovery may still be possible, but it would require advanced technical expertise and professional assistance. Here are a few steps you can take:

      1. Check the physical connections: Ensure that the disks are properly connected to the NAS device. Try reseating the disks or connecting them to different slots if possible.
      2. Test the disks individually: If the NAS has multiple disk slots, try removing one disk at a time and connecting it to a computer using a compatible adapter or enclosure. This can help determine if any of the disks have failed or if the issue lies with the NAS itself.
      3. Contact professional data recovery services: If the disks are still not recognized or if they are found to be faulty, it is recommended to contact a professional data recovery service. These experts have specialized tools and knowledge to recover data from faulty or damaged storage devices.
      4. Avoid further damage: It is crucial to avoid any further attempts at DIY data recovery if you are not experienced in handling storage devices. Incorrect handling or software attempts can potentially cause more damage and make data recovery more difficult or even impossible.

      Remember, data recovery can be a complex process, and success is not guaranteed. It is always recommended to have regular backups of your important data to avoid such situations.

      Reply
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Vladimir Artiukh

Author: Vladimir Artiukh, Technical Writer

Vladimir Artiukh is a technical writer for Hetman Software, as well as the voice and face of their English-speaking YouTube channel, Hetman Software: Data Recovery for Windows. He handles tutorials, how-tos, and detailed reviews on how the company’s tools work with all kinds of data storage devices.

Oleg Afonin

Editor: Oleg Afonin, Technical Writer

Oleg Afonin is an expert in mobile forensics, data recovery and computer systems. He often attends large data security conferences, and writes several blogs for such resources as xaker.ru, Elcomsoft and Habr. In addition to his online activities, Oleg’s articles are also published in professional magazines. Also, Oleg Afonin is the co-author of a well-known book, Mobile Forensics - Advanced Investigative Strategies.

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Questions and answers

  • What are the key features and functionalities of the web interface on the NAS Buffalo TeraStation WS5420DN08S9?

    The key features and functionalities of the web interface on the NAS Buffalo TeraStation WS5420DN08S9 are as follows:

    1. User-friendly Interface: The web interface is designed to be intuitive and user-friendly, allowing users to easily navigate and access various settings and features.
    2. Dashboard: The dashboard provides an overview of the NAS system, displaying important information such as system status, storage capacity, and network activity.
    3. File Management: The web interface allows users to manage files and folders stored on the NAS. Users can create, delete, rename, and move files and folders, as well as set access permissions for different users or groups.
    4. RAID Configuration: The TeraStation WS5420DN08S9 supports various RAID configurations for data redundancy and performance. The web interface allows users to easily set up and manage RAID levels, including RAID 0, 1, 5, 6, 10, and JBOD.
    5. Backup and Restore: Users can schedule automatic backups of their data to external drives or other NAS devices using the web interface. It also supports cloud backup services such as Amazon S3 or Dropbox. Additionally, the web interface allows for easy restoration of backed-up data.
    6. Remote Access: The NAS supports remote access, allowing users to access their files and data from anywhere with an internet connection. The web interface provides secure remote access options, including VPN and SSL/TLS encryption.
    7. User and Group Management: The web interface allows administrators to create and manage user accounts and groups, granting different levels of access and permissions to shared folders and files.
    8. Network Services: The NAS supports various network services, such as DHCP, DNS, and FTP. The web interface enables users to configure and manage these services easily.
    9. Monitoring and Alerts: The web interface provides monitoring tools to keep track of system performance, network activity, and storage usage. It also allows users to set up email notifications or alerts for specific events or conditions.
    10. Firmware Updates: The web interface allows users to check for and install firmware updates for the NAS, ensuring the system is up to date with the latest features and security patches.

    Overall, the web interface on the NAS Buffalo TeraStation WS5420DN08S9 offers a comprehensive set of features and functionalities for efficient storage management and data access.

  • How user-friendly is the web interface on the NAS Buffalo TeraStation WS5420DN08S9, and what customization options does it offer?

    The web interface on the NAS Buffalo TeraStation WS5420DN08S9 is generally considered user-friendly. It offers a straightforward and intuitive design, making it easy for users to navigate and access various features and settings.

    The customization options available on the web interface include:

    1. Dashboard Customization: Users can customize the dashboard by selecting which widgets to display, rearranging them, and resizing them according to their preferences. This allows users to have quick access to the information and features they use most frequently.
    2. File Management: The web interface provides options to create and manage shared folders, set access permissions, and configure file-related settings. Users can customize folder structures, set quotas, and enable features like recycle bin and file versioning.
    3. User and Group Management: Administrators can create and manage user accounts, assign user roles, and control access permissions. Customization options include creating user groups, setting user quotas, and defining folder access rights.
    4. Network Settings: Users can customize network settings such as IP address configuration, DNS settings, and network protocols. This allows for seamless integration with existing network infrastructure and customization based on specific requirements.
    5. Backup and Replication: The NAS offers various backup options, including scheduled backups, real-time replication, and cloud backup integration. Users can customize backup settings, select specific folders or files to be backed up, and configure backup destinations.
    6. Security and Encryption: The web interface allows users to customize security settings, including configuring firewall rules, enabling SSL/TLS encryption, and managing user authentication methods. This helps enhance data security and privacy.
    7. Notifications and Alerts: Users can customize notification settings to receive alerts via email or other methods for events such as disk failures, system updates, or unauthorized access attempts.

    Overall, the NAS Buffalo TeraStation WS5420DN08S9 web interface offers a range of customization options that allow users to tailor the device to their specific needs and preferences.

  • Can you provide a step-by-step guide on how to access and navigate the web interface on the NAS Buffalo TeraStation WS5420DN08S9 for managing files and settings?

    Sure! Here's a step-by-step guide on how to access and navigate the web interface on the NAS Buffalo TeraStation WS5420DN08S9:

    1. Connect your NAS Buffalo TeraStation to your local network and power it on.
    2. Open a web browser on your computer or device that is connected to the same network.
    3. In the address bar of the web browser, type in the IP address of your NAS Buffalo TeraStation. The default IP address is usually "192.168.0.100" or "192.168.11.150". You can find the specific IP address of your NAS by checking your router's connected devices list or using a network scanning tool.
    4. Press Enter or Return to access the web interface login page.
    5. On the login page, enter the default username and password. The default username is "admin" and the default password is "password". If you have changed the login credentials, use the updated username and password.
    6. Click on the "Login" button to log in to the web interface.
    7. Once logged in, you will be on the Dashboard page, which provides an overview of your NAS status and system information.
    8. To manage files, click on the "File Sharing" tab or a similar option, depending on the firmware version of your NAS. This will take you to the file management section where you can create folders, upload files, and manage file permissions.
    9. To access and configure settings, look for a "Settings" or "Management" tab. Here, you can modify various NAS settings, such as network configuration, user accounts, RAID configuration, and more. The specific options and layout may vary depending on the firmware version of your NAS.
    10. Explore the different sections and options within the web interface to customize and manage your NAS according to your requirements.

    Remember to consult the user manual or online documentation specific to your NAS model for detailed instructions and any firmware-specific features.
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