Complete RAID Array Recovery Guide for NAS Buffalo TeraStation TS3420DN3204

Has your NAS Buffalo TeraStation TS3420DN3204 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?

Complete RAID Array Recovery Guide for NAS Buffalo TeraStation TS3420DN3204
Data Recovery Tool

Buffalo TeraStation TS3420DN3204 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 TS3420DN3204. We’ll walk through the most common causes of failure and demonstrate proven methods to restore files from a lost or degraded RAID array.

Complete RAID Array Recovery Guide for NAS Buffalo TeraStation TS3420DN3204

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 the use of specific data recovery software or services impact the success rate of data retrieval from NAS Buffalo TeraStation TS3420DN3204 devices?

Yes, the use of specific data recovery software or services can impact the success rate of data retrieval from NAS Buffalo TeraStation TS3420DN3204 devices. The success of data retrieval depends on various factors such as the type of data loss, the extent of damage to the device, and the effectiveness of the recovery software or service being used.

Using reliable and specialized data recovery software or services designed for NAS devices can significantly improve the chances of successful data retrieval. These tools and services are specifically developed to handle the complexities of NAS systems and have advanced algorithms to recover data from various storage configurations.

However, it is important to note that not all data recovery software or services are created equal. Some may have better compatibility and success rates with specific NAS devices like the Buffalo TeraStation TS3420DN3204. It is recommended to research and choose reputable software or services that have a proven track record in recovering data from NAS devices, and preferably those that have experience with Buffalo TeraStation models.

Additionally, it is crucial to follow proper procedures and precautions while attempting data recovery to avoid further damage to the device and data loss. If the data loss is critical or the device is physically damaged, it is advisable to seek professional data recovery services as they have the expertise and specialized tools to handle complex situations.

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

Although the NAS TeraStation TS3420DN3204 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 TS3420DN3204. 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 TS3420DN3204 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 TS3420DN3204 network-attached storage keeps OS Linux 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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We will be happy to answer your questions!

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 TS3420DN3204, feel free to leave a comment!
    Reply
  • Zayden Soulsby
    Zayden Soulsby 31.08.2023 13:52 #
    Are there any specific file systems used in NAS Buffalo TeraStation TS3420DN3204 devices that may affect data recovery?
    Reply
    • Hetman Software
      Hetman Software 31.08.2023 15:00 #

      The Buffalo TeraStation TS3420DN3204 devices typically use the XFS file system. This file system is designed for high-performance and scalability, making it well-suited for NAS devices. However, it is worth noting that the file system used does not directly affect data recovery. Data recovery is primarily dependent on factors such as the underlying storage media, the nature of the data loss, and the tools and techniques used for recovery.

      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 TS3420DN3204 that make it suitable for use as central storage?

    The NAS Buffalo TeraStation TS3420DN3204 is suitable for use as central storage due to its key features and specifications:

    1. Storage Capacity: It comes with a total storage capacity of 32TB (4 x 8TB) or can be expanded up to 128TB with additional drives. This ample storage space allows for centralized storage of large amounts of data.
    2. RAID Support: The NAS supports RAID levels 0, 1, 5, 6, 10, and JBOD, providing data redundancy and protection against drive failures. This ensures the safety and integrity of the stored data.
    3. Dual Gigabit Ethernet Ports: The device is equipped with two Gigabit Ethernet ports, enabling high-speed data transfer and ensuring smooth and efficient access to the central storage by multiple users simultaneously.
    4. Powerful Processor: It features a quad-core Annapurna Labs Alpine AL314 1.7 GHz processor, which provides fast and reliable performance for data processing and file transfers.
    5. RAM and Memory: The NAS comes with 4GB of DDR3 RAM, ensuring smooth multitasking and efficient handling of multiple concurrent tasks. It also has two USB 3.0 ports for additional external storage options.
    6. Hot-Swap Functionality: The device supports hot-swappable hard drives, allowing for easy replacement or expansion of drives without interrupting the operation or shutting down the system.
    7. Advanced Security Features: It offers various security features, including AES 256-bit encryption, secure boot, and integrated anti-virus, ensuring data privacy and protection against malware.
    8. Backup and Synchronization: The NAS supports various backup options, such as scheduled backups, replication to other TeraStations, and cloud backup services like Amazon S3 or Dropbox. It also allows for easy synchronization of files across multiple devices.
    9. Remote Access and Management: It provides remote access and management capabilities, allowing users to access their data and manage the NAS from anywhere using a web browser or mobile apps.
    10. Scalability: The NAS is scalable and can be expanded by adding additional drives or connecting it to other Buffalo TeraStations, making it suitable for growing storage needs.

    Overall, the NAS Buffalo TeraStation TS3420DN3204 offers ample storage capacity, robust performance, data redundancy, advanced security features, and scalability, making it an ideal choice for central storage in small to medium-sized businesses or home offices.

  • How does the NAS Buffalo TeraStation TS3420DN3204 ensure data security and protection for centralized storage?

    The NAS Buffalo TeraStation TS3420DN3204 ensures data security and protection through various features and technologies. Here are some ways it achieves this:

    1. RAID Technology: The TeraStation TS3420DN3204 supports RAID levels 0, 1, 5, 6, 10, and JBOD. RAID (Redundant Array of Independent Disks) provides data redundancy and protection against drive failures. It distributes data across multiple drives, ensuring that if one drive fails, the data can still be accessed from the remaining drives.
    2. Encryption: The TeraStation TS3420DN3204 supports AES 256-bit encryption, which encrypts the data stored on the drives. This ensures that even if the drives are stolen or accessed by unauthorized individuals, the data remains secure and unreadable without the encryption key.
    3. Active Directory Integration: The NAS supports Active Directory integration, allowing administrators to manage user access and permissions centrally. This ensures that only authorized users can access the stored data, enhancing security and preventing unauthorized access.
    4. Scheduled Backup and Replication: The TeraStation TS3420DN3204 allows for scheduled backups and replication of data to external drives or other NAS devices. This ensures that data is regularly backed up and can be easily restored in case of accidental deletion, data corruption, or system failure.
    5. Anti-Virus Integration: The NAS supports integration with antivirus software, allowing for real-time scanning and protection against malware and viruses. This helps to prevent data loss or corruption due to malicious software.
    6. User and Group Management: The TeraStation TS3420DN3204 provides robust user and group management capabilities. Administrators can create and manage multiple user accounts and groups, assign different access levels and permissions to each user or group, and control who can access and modify specific files and folders.
    7. Data Recovery: In the event of data loss or accidental deletion, the NAS offers various data recovery options. This includes the ability to restore previous versions of files, undelete files, or recover data from backups.
    8. Physical Security: The TeraStation TS3420DN3204 is designed with physical security in mind. It includes features like lockable drive bays and Kensington lock support, which help prevent unauthorized physical access to the drives and the NAS itself.

    Overall, the NAS Buffalo TeraStation TS3420DN3204 employs a combination of hardware and software features to ensure data security and protection for centralized storage.

  • What are the advantages and potential limitations of using the NAS Buffalo TeraStation TS3420DN3204 as central storage compared to other similar NAS devices available in the market?

    Advantages of using the NAS Buffalo TeraStation TS3420DN3204 as central storage:

    1. High storage capacity: The TS3420DN3204 offers a large storage capacity of 32TB, which can be expanded further using its expansion ports. This makes it suitable for businesses or individuals with extensive storage needs.
    2. RAID support: The NAS supports various RAID configurations, including RAID 0, 1, 5, 6, 10, and JBOD. This allows for data redundancy and improved performance, ensuring data integrity and protection against drive failures.
    3. High-speed data transfer: The TS3420DN3204 comes equipped with two Gigabit Ethernet ports, enabling faster data transfer speeds and efficient sharing of files across the network.
    4. Backup and recovery options: Buffalo provides multiple backup options, including scheduled backups, cloud backups, and replication to another TeraStation. This ensures data safety and provides quick recovery options in case of data loss or system failure.
    5. Easy setup and management: The NAS offers a user-friendly interface and intuitive setup process, making it easy for users to configure and manage their storage system. It also supports various protocols and features like Active Directory integration, SNMP, and DFS Namespace.

    Potential limitations of the NAS Buffalo TeraStation TS3420DN3204:

    1. Limited software ecosystem: Compared to some other NAS devices, the TeraStation TS3420DN3204 may have a more limited range of software applications and add-ons available. This can restrict customization and additional functionalities based on specific requirements.
    2. Price: The TS3420DN3204 may be relatively expensive compared to other similar NAS devices with similar specifications and features. This could be a limitation for budget-conscious users or those with less demanding storage needs.
    3. Performance limitations: While the NAS provides good performance for most small to medium-sized businesses, it may not be suitable for organizations requiring extremely high-speed data transfer or heavy workloads. Users with demanding requirements may need to consider higher-end NAS solutions.
    4. Lack of hot-swappable drives: The TS3420DN3204 does not support hot-swappable drives, meaning that if a drive fails, the system needs to be powered down to replace it. This can result in some downtime and inconvenience.
    5. Limited expansion options: Although the NAS supports expansion through additional ports, the expansion capacity may be limited compared to other NAS devices in the market. This can be a limitation for businesses with rapidly growing storage needs.
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