How to recover data from TerraMaster T9-423 NAS

Is your network drive gone, and you are wondering what to do? Has a RAID system crashed, and your files are no longer accessible? Does your device display an error while booting? Have you accidentally rebuilt your RAID system? Are several hard disks out of order?

How to recover data from NAS TerraMaster T9-423

TerraMaster T9-423 NAS Data Recovery in 2024

In this step-by-step tutorial, we’ll show you how to rebuild your RAID and recover data from T9-423.

How to recover data from NAS TerraMaster T9-423

Recover data from damaged RAID arrays inaccessible from a computer.

Why can’t ordinary software tools restore files from RAID?

Conventional hard disks keep user’s data by writing it to their surface in a consecutive way, and this is how an entire file is stored on a single hard disk. However, when data is written to a RAID system, a file is divided into several parts. Then these parts are written consecutively to all hard disks within such array. The size of such parts may range from 2 KB to 2 MB, so each file is stored on several hard disks at the same time.

Such approach helps to speed up read and write operations, and it is evident that saving two parts of a file having the size of 1 GB to two hard disks simultaneously is much faster than saving the same 1 GB of data to one hard disk. However, this peculiarity makes file recovery more complicated.

Various RAID levels store information in different ways. Additionally, manufacturers like TerraMaster also introduce some modifications to this process, and that is why data can be written to hard disk in a wide variety of ways.

How can a NAS TerraMaster T9-423 device's power management settings impact data availability and potential loss?

The power management settings of a NAS (Network Attached Storage) device like the TerraMaster T9-423 can impact data availability and potential loss in the following ways:

  1. Sleep Mode: NAS devices often have a sleep mode that automatically powers down the hard drives after a certain period of inactivity. While this can save power, it can also lead to delays when accessing data as the drives need to spin up again. If a user tries to access data during this spin-up time, it can result in slower performance and reduced availability.
  2. Power Loss: If the NAS device experiences a sudden power loss or is improperly shut down, it can result in data loss or corruption. This is especially true if there are any pending write operations that haven't been completed. Power management settings that control how the NAS device handles power loss, such as ensuring proper shutdown procedures or using battery backup solutions, can help mitigate the risk of data loss.
  3. Scheduled Power On/Off: Some NAS devices allow users to schedule automatic power on/off times. While this can be convenient for saving power during off-peak hours, it can also impact data availability if users need access to the NAS during the scheduled off time. It's important to consider the operational needs of the NAS and schedule power on/off times accordingly to minimize any potential data unavailability.
  4. RAID Rebuild: If the NAS device is configured with a RAID (Redundant Array of Independent Disks) setup and a drive fails, the power management settings can affect how quickly the RAID array rebuilds itself. Delaying or limiting the resources dedicated to the rebuild process can increase the time it takes to restore data redundancy, leaving the system vulnerable to potential data loss if another drive fails during this period.
  5. Network Connectivity: Power management settings can also impact network connectivity, especially if the NAS device enters sleep mode or powers down during periods of inactivity. This can result in temporary unavailability of data until the NAS wakes up or powers on again, causing potential disruptions in accessing files or services.

To minimize the impact of power management settings on data availability and potential loss, it's essential to strike a balance between power-saving measures and ensuring quick and reliable access to data. Regular backups, proper shutdown procedures, appropriate RAID configurations, and understanding the operational needs of the NAS can help mitigate any risks associated with power management settings.

How to take hard disks out of the NAS and connect them to a PC?

Although NAS T9-423 can be accessed over the network, you still need to take the hard disks out of the storage device and connect them to a Windows computer. Only in this case will the software be able to scan them properly. Here is what you should do:

  1. Turn off the storage and disconnect it from the power supply.

    WARNING! Before you start taking hard disks out of your NAS device, read the manual carefully. Incorrect actions may damage your network-attached storage and/or the hard disks within the RAID system.

  2. Take the hard disks out of the NAS one by one, carefully removing them from their slots. Remember that the disks are extremely vulnerable: hitting or dropping them may result in serious physical damage.

  3. Make sure to mark each hard disk in accordance with how they were installed inside the NAS.

  4. Remove the hard disks and connect them to the computer. In this video, we have explored what ports are used to connect hard disks, and what to do if there are not enough ports or connectors.

    Go to view
    How to Order Remote Data Recovery

    How to Order Remote Data Recovery

Restoring data with Hetman RAID Recovery

Hetman Raid Recovery

This program recovers data from damaged RAID arrays and is fully compatible with TerraMaster T9-423. The hard disks that make up the RAID contain technical information about the algorithm used to save files. When launched, Hetman RAID Recovery reads this information and puts the damaged array together. Then you can open the disk and save your files. Also, you can recover the files accidentally deleted from the network drive.

Go to view
How to recover data from a TerraMaster

How to recover data from a TerraMaster

T9-423 has 9 HDD slots, and it supports the following array types:

  • RAID 0;
  • RAID 1;
  • RAID 5;
  • RAID 6;
  • RAID 50;
  • RAID 60;
  • JBOD;

NAS supports:

  • Ext2;
  • Ext3;
  • Ext4;
  • Btrfs;

Safe recovery from disk images

This utility lets you save an entire copy of the disk to file and then work with this image instead of the actual disk. Such feature helps to protect data on the disk from:

  • Overwriting during the recovery process;
  • Loss resulting from bad sectors;
  • User mistakes.

To create an image, do the following:

  1. Make sure that you have enough free space to save the image. The image file size usually equals the disk size.

  2. Select the disk in the main window, and choose from the menu ToolsSave Disk. You can select multiple disks to be saved.

  3. When the image creation wizard starts, you can choose to save the entire disk or select only a part of it. Specify the parameters and click Next.

    Hetman Raid Recovery: Image Creation Wizard
  4. At this stage, you need to choose a directory where to save the image. Choose any disk connected to this PC, or save the image by FTP.

    Hetman Raid Recovery: hoose any disk connected to this PC, or save the image by FTP

Where are user’s files stored?

The TerraMaster T9-423 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.

Comparison of software for RAID recovery

Product Operating system License type RAID controller support Supported file systems Virtual RAID controller support Data recovery from damaged RAID File preview
Hetman RAID Recovery Windows Paid Yes, over 100 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes
DiskInternals RAID Recovery Windows Paid Yes, over 100 controllers FAT, NTFS, Ext2/3/4, HFS+ No Yes Yes
R-Studio Windows, Mac, Linux Paid Yes, over 200 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes
UFS Explorer RAID Recovery Windows, Mac, Linux Paid Yes, over 1,000 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes
EaseUS Data Recovery Windows Paid Yes, over 20 controllers FAT, NTFS, Ext2/3/4, HFS+ No Yes Yes
ReclaiMe Free RAID Recovery Windows Free Yes, over 100 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes


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 T9-423, feel free to leave a comment!
  • Taylor Shankland
    Taylor Shankland 10.09.2023 07:51 #
    Can data recovery from a NAS TerraMaster T9-423 device be done if the device is showing signs of disk or storage media errors?
    • Hetman Software
      Hetman Software 10.09.2023 09:00 #

      Yes, data recovery from a NAS TerraMaster T9-423 device can be done even if the device is showing signs of disk or storage media errors. However, it is important to note that the success of data recovery depends on the severity and nature of the errors.

      If the device is still accessible and only a few files or folders are affected, you may be able to recover the data by using specialized data recovery software. These tools can scan the storage media, identify and recover the lost or corrupted files.

      However, if the errors are more severe and the device is not accessible or the data is highly critical, it is recommended to seek professional data recovery services. They have specialized equipment and expertise to handle complex data recovery scenarios. They can disassemble the device, repair or replace faulty hardware components, and recover the data using advanced techniques.

      It is important to stop using the device immediately once you notice signs of disk or storage media errors to prevent further damage and increase the chances of successful data recovery.

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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, 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.


Questions and answers

  • How does the NAS TerraMaster T9-423 operate with Wi-Fi standard? Does it support the latest Wi-Fi standards like 802.11ac or 802.11ax?

    The NAS TerraMaster T9-423 does not operate with Wi-Fi standard as it is a network-attached storage device. It is designed to connect to your local network using an Ethernet cable, not Wi-Fi. Therefore, it does not support Wi-Fi standards like 802.11ac or 802.11ax. To access the NAS, you would need to connect it to your router or switch using an Ethernet cable, and then access it over the network using a computer or other devices connected to the same network.

  • Can the NAS TerraMaster T9-423 be connected to a Wi-Fi network without the need for additional adapters or dongles? How easy is the setup process for Wi-Fi connectivity?

    No, the NAS TerraMaster T9-423 does not have built-in Wi-Fi capabilities. To connect it to a Wi-Fi network, you would need to use an external Wi-Fi adapter or dongle. The setup process for Wi-Fi connectivity would depend on the specific adapter or dongle you choose to use, but it typically involves plugging in the adapter, configuring the network settings, and connecting to the desired Wi-Fi network through the NAS interface. The ease of setup may vary depending on the adapter and the user's familiarity with network configurations.

  • What are the advantages and limitations of operating the NAS TerraMaster T9-423 with Wi-Fi standard compared to using a wired Ethernet connection? Are there any performance differences or potential security concerns to consider?

    Operating the NAS TerraMaster T9-423 with Wi-Fi standard offers some advantages and limitations compared to using a wired Ethernet connection. Here are some factors to consider:

    Advantages of Wi-Fi:

    1. Convenience: Wi-Fi allows for easy and flexible placement of the NAS device without the need for physical Ethernet cables.
    2. Mobility: With Wi-Fi, you can access the NAS from multiple devices without being restricted to a specific location.
    3. Cost: Setting up a Wi-Fi network may be more cost-effective compared to running Ethernet cables throughout the premises.

    Limitations of Wi-Fi:

    1. Speed: Wired Ethernet connections generally provide faster and more stable data transfer speeds compared to Wi-Fi. This can impact performance, especially for bandwidth-intensive tasks.
    2. Range: Wi-Fi signals can be affected by physical obstructions and distance limitations, leading to reduced signal strength and potential connectivity issues.
    3. Interference: Other devices operating on the same Wi-Fi frequency can cause interference, affecting the reliability and performance of the connection.
    4. Security: Wi-Fi networks are generally more susceptible to security breaches compared to wired Ethernet connections. Additional security measures such as strong encryption and network isolation should be implemented to mitigate potential risks.

    Performance Differences:

    Using a wired Ethernet connection typically provides better performance due to its higher data transfer speeds and more stable connection. This is especially important for tasks that involve large file transfers, media streaming, or running applications that require low latency.

    Potential Security Concerns:

    Wi-Fi networks are more vulnerable to security threats such as unauthorized access, eavesdropping, or data interception compared to wired Ethernet connections. It is crucial to implement strong security measures, including using encryption protocols (e.g., WPA2) and regularly updating firmware to minimize security risks.

    In summary, while Wi-Fi offers convenience and flexibility, a wired Ethernet connection generally provides better performance and enhanced security. The choice between the two depends on the specific requirements, network environment, and the level of importance placed on speed and security.

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