How to Recover Data from NAS Buffalo TeraStation WS5420RN40S9: Advanced Step-by-Step RAID Array Guide

Has your NAS Buffalo TeraStation WS5420RN40S9 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?

How to Recover Data from NAS Buffalo TeraStation WS5420RN40S9: Advanced Step-by-Step RAID Array Guide
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Buffalo TeraStation WS5420RN40S9 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 WS5420RN40S9. We’ll walk through the most common causes of failure and demonstrate proven methods to restore files from a lost or degraded RAID array.

How to Recover Data from NAS Buffalo TeraStation WS5420RN40S9: Advanced Step-by-Step RAID Array Guide

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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 virtualization technologies impact data loss risks in NAS Buffalo TeraStation WS5420RN40S9 devices?

Yes, virtualization technologies can impact data loss risks in NAS Buffalo TeraStation WS5420RN40S9 devices. By using virtualization, you can create multiple virtual machines (VMs) on a single physical server, allowing for better utilization of resources and improved data protection.

Here are a few ways virtualization can help mitigate data loss risks:

  1. Improved backup and disaster recovery: Virtualization enables you to take snapshots of VMs, allowing for quick and easy backups. These snapshots can be used to restore data in case of accidental deletion, hardware failure, or other data loss events.
  2. High availability and fault tolerance: Virtualization platforms often offer features like live migration and high availability, which allow VMs to be moved to different physical servers without any downtime. This ensures that if one physical server fails, the VMs can be quickly and automatically moved to another server, minimizing the risk of data loss.
  3. Isolation and containment: Virtual machines can be isolated from each other, preventing any potential malware or software issues in one VM from affecting others. This containment helps in reducing the risk of data loss due to malware attacks or software misconfigurations.
  4. Testing and development environments: With virtualization, you can easily create and manage multiple VMs for testing and development purposes. This allows you to test software updates, patches, or configuration changes without risking the production environment. In case of any issues or data loss, it will only affect the VM and not the entire NAS device.

It's important to note that while virtualization can help mitigate data loss risks, it is not a substitute for proper backup and disaster recovery strategies. Regular backups, off-site storage, and other data protection measures should still be implemented to ensure comprehensive data loss prevention.

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

Although the NAS TeraStation WS5420RN40S9 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 WS5420RN40S9. 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 WS5420RN40S9 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 WS5420RN40S9 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 WS5420RN40S9, feel free to leave a comment!
    Reply
  • Brian Fox
    Brian Fox 31.08.2023 23:47 #
    Is it possible to recover data from a NAS Buffalo TeraStation WS5420RN40S9 device that has been infected by malware or viruses?
    Reply
    • Hetman Software
      Hetman Software 1.09.2023 01:00 #

      Yes, it is possible to recover data from a NAS Buffalo TeraStation WS5420RN40S9 device that has been infected by malware or viruses. However, the process can be complex and may require the assistance of a professional data recovery service.

      Here are some general steps you can take to recover data from an infected NAS device:

      1. Isolate the infected device: Disconnect the NAS from the network to prevent the malware from spreading further.
      2. Assess the damage: Determine the extent of the infection and identify the type of malware or virus present.
      3. Remove the malware: Use antivirus or anti-malware software to scan and remove the malicious software from the NAS device. Ensure that the software is up to date and capable of detecting the specific malware or virus.
      4. Restore from backups: If you have recent backups of your data, restore the files from the backup to a clean and secure location. This is the easiest and most reliable method to recover data.
      5. Professional data recovery: If you don't have backups or if the backups are also infected, consider contacting a professional data recovery service. They have specialized tools and expertise to recover data from infected devices. Be prepared for the possibility that not all data may be recoverable, and the process can be expensive.

      It's important to note that prevention is always better than recovery. Regularly update your NAS firmware and antivirus software, implement strong security measures, and maintain up-to-date backups to minimize the risk of data loss due to malware or viruses.

      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 specifications of the NAS Buffalo TeraStation WS5420RN40S9 that make it suitable for use as central storage?

    The NAS Buffalo TeraStation WS5420RN40S9 is suitable for use as central storage due to its key features and specifications, which include:

    1. High Storage Capacity: It comes with a massive storage capacity of 40TB, allowing users to store and manage a large amount of data centrally.
    2. RAID Support: The NAS supports various RAID configurations (RAID 0, 1, 5, 6, and 10), providing data redundancy and protection against drive failures.
    3. Dual-Port 10GbE: It offers dual-port 10GbE connectivity, enabling high-speed data transfer and ensuring fast access to stored files.
    4. Powerful Processor: The TeraStation is equipped with a quad-core Annapurna Labs Alpine AL314 1.7GHz processor, which ensures smooth and efficient performance.
    5. ECC Memory: It features 8GB of ECC DDR3 RAM, providing error correction capabilities and enhancing data integrity.
    6. Scalability: The NAS supports expansion units, allowing users to increase storage capacity as their needs grow.
    7. Multiple File Sharing Protocols: It supports various file sharing protocols such as SMB/CIFS, AFP, FTP, and NFS, making it compatible with different operating systems and devices.
    8. Snapshot Backup: The TeraStation offers snapshot backup functionality, allowing users to create point-in-time copies of their data for quick recovery in case of accidental deletion or data corruption.
    9. Active Directory Integration: It seamlessly integrates with Active Directory, simplifying user authentication and access management.
    10. Data Encryption: The NAS supports AES 256-bit data encryption, ensuring the security and confidentiality of stored data.
    11. Remote Access: It provides remote access capabilities, allowing users to access their files and data from anywhere using a web browser or mobile app.
    12. Backup and Sync Solutions: The TeraStation supports various backup and sync solutions, including Buffalo's NovaBACKUP and Dropbox, ensuring data protection and synchronization across devices.

    Overall, the NAS Buffalo TeraStation WS5420RN40S9 offers a robust and feature-rich solution for central storage, providing high capacity, fast connectivity, data protection, and easy management.

  • How does the NAS Buffalo TeraStation WS5420RN40S9 facilitate efficient and secure data storage and access in a network environment?

    The NAS Buffalo TeraStation WS5420RN40S9 facilitates efficient and secure data storage and access in a network environment through several features and functionalities:

    1. High storage capacity: The TeraStation WS5420RN40S9 offers a large storage capacity, allowing organizations to store a significant amount of data in one centralized location. This eliminates the need for multiple storage devices and simplifies data management.
    2. RAID support: The NAS supports various RAID configurations, such as RAID 0, 1, 5, 6, 10, and JBOD. RAID provides data redundancy and improves performance, ensuring data integrity and availability even in case of drive failures.
    3. Redundant power supply: The TeraStation WS5420RN40S9 comes with a redundant power supply, which ensures continuous operation even if one power supply unit fails. This feature enhances data availability and reduces the risk of data loss due to power outages.
    4. Advanced security features: The NAS offers multiple security features to protect data from unauthorized access. It supports AES 256-bit encryption, which ensures that data stored on the device is encrypted and secure. Additionally, it provides Active Directory integration, enabling centralized user and group management for access control.
    5. Data backup and replication: The TeraStation WS5420RN40S9 supports various backup options, including scheduled backups, real-time replication, and cloud backup integration. These features help organizations create multiple copies of their data, ensuring data availability and protection against data loss.
    6. Remote access and collaboration: The NAS provides remote access capabilities, allowing users to access their data securely from anywhere using a web browser or mobile app. This facilitates remote collaboration and enhances productivity for distributed teams.
    7. Scalability and expandability: The TeraStation WS5420RN40S9 is designed to be scalable, allowing organizations to expand their storage capacity as their data needs grow. It supports additional external storage devices and can be easily integrated into an existing network infrastructure.

    Overall, the NAS Buffalo TeraStation WS5420RN40S9 combines high storage capacity, advanced security features, data backup options, remote access capabilities, and scalability to facilitate efficient and secure data storage and access in a network environment.

  • What are some practical use cases or industries where the NAS Buffalo TeraStation WS5420RN40S9 can be effectively utilized as central storage, and what benefits does it offer in those scenarios?

    The NAS Buffalo TeraStation WS5420RN40S9 can be effectively utilized as central storage in various industries and use cases. Some practical scenarios where it can be beneficial include:

    1. Small and Medium-sized Businesses (SMBs): The TeraStation can serve as a centralized storage solution for SMBs, providing a secure and reliable platform for storing and accessing critical business data. It offers benefits such as data redundancy through RAID configurations, easy scalability, and support for multiple users and devices.
    2. Creative and Media Production: Industries like graphic design, video editing, and animation require large amounts of storage space for media files. The TeraStation's high capacity and fast data transfer speeds make it suitable for storing and sharing large multimedia files among team members, improving collaboration and productivity.
    3. Education and Research Institutions: Schools, colleges, and research institutions often deal with vast amounts of data, including research papers, educational resources, and multimedia content. The TeraStation can act as a central repository for storing and sharing educational materials, facilitating easy access and collaboration among students, faculty, and researchers.
    4. Surveillance and Security: With its large storage capacity, the TeraStation can serve as a central storage solution for surveillance systems. It can store and manage video footage from multiple cameras, providing a secure and scalable platform for long-term storage of surveillance data.
    5. Virtualization and Backup: The TeraStation supports virtualization technologies such as VMware and Hyper-V, allowing businesses to create virtual machines and store them centrally. Additionally, it offers backup features like snapshotting and replication, ensuring data protection and disaster recovery capabilities.

    Benefits offered by the TeraStation in these scenarios include:

    • High storage capacity: The TeraStation offers terabytes of storage space, allowing organizations to store and manage large amounts of data in a centralized manner.
    • Data redundancy and protection: The NAS supports RAID configurations, ensuring data redundancy and protection against drive failures. This feature enhances data integrity and minimizes the risk of data loss.
    • Scalability: The TeraStation can be easily expanded by adding additional drives or connecting it to other Buffalo NAS devices, providing scalability to accommodate growing storage needs.
    • Data sharing and collaboration: The TeraStation supports multiple user access and file-sharing protocols, enabling seamless collaboration among team members, departments, or organizations.
    • Data security: The NAS offers features like built-in encryption, Active Directory integration, and antivirus support, ensuring data security and protecting against unauthorized access or malware attacks.
    • High-speed data transfer: The TeraStation supports high-speed network connectivity options like 10GbE, enabling fast data transfer and access, crucial for scenarios involving large file sizes or multimedia content.

    Overall, the NAS Buffalo TeraStation WS5420RN40S9 provides a robust and feature-rich central storage solution suitable for various industries, offering benefits such as scalability, data protection, collaboration, and data security.
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