How to recover data from QNAP TVS-873 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 QNAP TVS-873

QNAP TVS-873 NAS Data Recovery in 2024

In this step-by-step tutorial, we’ll show you how to rebuild your RAID and recover data from TVS-873.

How to recover data from NAS QNAP TVS-873

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 QNAP also introduce some modifications to this process, and that is why data can be written to hard disk in a wide variety of ways.

Are there any specific precautions to take while migrating data between NAS QNAP TVS-873 devices?

Yes, there are some precautions to take while migrating data between NAS QNAP TVS-873 devices. Here are a few important ones:

  1. Backup your data: Before starting the migration process, it is crucial to create a backup of all your important data. This ensures that even if something goes wrong during the migration, you still have a copy of your data.
  2. Check compatibility: Ensure that both the source and target QNAP TVS-873 devices are running compatible firmware versions. It is recommended to update the firmware to the latest version before starting the migration.
  3. Verify storage capacity: Make sure that the target QNAP TVS-873 device has enough storage capacity to accommodate all the data from the source device. Check the available storage space and plan accordingly.
  4. Network stability: Ensure that your network connection is stable and reliable during the migration process. Any interruptions or network issues can lead to data corruption or loss.
  5. Plan for downtime: Migrating data between NAS devices can take time, especially if you have a large amount of data. Plan for a maintenance window or downtime to perform the migration without any interruptions.
  6. Follow QNAP's migration guide: QNAP provides detailed migration guides for specific models. It is recommended to follow their official documentation and instructions for a smooth and successful migration process.
  7. Test after migration: Once the migration is complete, test the accessibility and functionality of your data on the new QNAP TVS-873 device. Ensure that all your files, applications, and services are working as expected.

By following these precautions, you can minimize the risk of data loss or corruption during the migration process.

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

Although NAS TVS-873 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 QNAP TVS-873. 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 QNAP

How to recover data from a QNAP

TVS-873 has 8 HDD slots, and it supports the following array types:

  • RAID 50;
  • RAID 60;
  • RAID 6;
  • RAID 5;
  • RAID 10;
  • RAID 0;
  • RAID 1;
  • JBOD;

NAS supports:

  • ZFS;
  • EXT4;
  • EXT3;
  • exFAT;
  • FAT32 (External Disk Only);
  • NTFS (External Disk Only);
  • HFS+ (External Disk Read Only);

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 QNAP TVS-873 network-attached storage keeps QTS (QuTS hero) 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 TVS-873, feel free to leave a comment!
  • Sean Horler
    Sean Horler 17.09.2023 00:42 #
    Can data recovery from a NAS QNAP TVS-873 device be done if the storage disks have bad sectors?
    • Hetman Software
      Hetman Software 17.09.2023 02:00 #

      Yes, data recovery from a QNAP TVS-873 device can be attempted even if the storage disks have bad sectors. However, the success of the recovery process will depend on the severity of the bad sectors and the condition of the disks.

      If the bad sectors are isolated and only a few, there are higher chances of successful data recovery. In such cases, data recovery software or specialized tools can be used to bypass the bad sectors and retrieve the data from the remaining good sectors.

      However, if the disks have a large number of bad sectors or if they are physically damaged, the recovery process becomes more challenging. In such cases, it is recommended to seek professional data recovery services from specialized companies who have the expertise and equipment to recover data from damaged disks.

      It is important to note that attempting data recovery on your own, especially if the disks are physically damaged, can further worsen the situation and potentially result in permanent data loss. Therefore, it is advisable to consult with experts in data recovery to maximize the chances of successful 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

  • What are the benefits of regularly updating the software on a QNAP TVS-873 NAS?

    Regularly updating the software on a QNAP TVS-873 NAS (Network Attached Storage) offers several benefits:

    1. Security: Software updates often include security patches and fixes that address vulnerabilities and potential exploits. By keeping your NAS software up to date, you ensure that your data and network are protected against emerging threats.
    2. Stability: Updates often include bug fixes and performance improvements, enhancing the stability and reliability of your NAS. This helps prevent crashes, errors, and other issues that may impact the functionality of your device.
    3. Compatibility: As technology evolves, software updates often introduce compatibility improvements with new hardware, operating systems, and applications. Keeping your NAS up to date ensures that it can seamlessly integrate with the latest devices and software, allowing for a smoother user experience.
    4. New Features: Software updates may introduce new features and functionalities that enhance the capabilities of your NAS. These updates can expand the range of applications, services, and options available to you, enabling you to optimize your NAS for your specific needs.
    5. Performance Optimization: Updates may include performance optimizations that improve the speed, responsiveness, and overall performance of your NAS. These improvements can enhance data transfer speeds, reduce latency, and optimize resource utilization, resulting in a more efficient NAS system.
    6. Support and Warranty: Regularly updating your QNAP NAS software ensures that you remain eligible for technical support and warranty coverage. Manufacturers often require users to be on the latest software version before providing assistance, so staying up to date ensures you can access necessary support when needed.

    In summary, regularly updating the software on your QNAP TVS-873 NAS enhances security, stability, compatibility, and performance, while also providing access to new features and maintaining eligibility for support and warranty coverage.

  • How can I check for and install software updates on my QNAP TVS-873 NAS?

    To check for and install software updates on your QNAP TVS-873 NAS, follow these steps:

    1. Log in to your QNAP NAS web interface by entering the IP address of the NAS into your web browser.
    2. Enter your username and password to log in.
    3. Once logged in, click on "Control Panel" in the upper-right corner of the web interface.
    4. In the Control Panel, click on "System Settings" and then "Firmware Update."
    5. On the Firmware Update page, click on the "Check for Update" button to check for the latest firmware version available for your NAS.
    6. If a new firmware version is available, click on the "Update Now" button to start the update process. Make sure to read and follow any on-screen instructions or prompts during the update process.
    7. The NAS will start downloading and installing the firmware update. Do not turn off or restart the NAS during the update process.
    8. After the update is complete, the NAS will automatically reboot, and you will be able to log back in to the web interface.

    Note: It is recommended to backup your data before performing a firmware update to avoid any potential data loss.

  • Are there any precautions or best practices to follow when performing a software update on a QNAP TVS-873 NAS?

    Yes, there are several precautions and best practices to follow when performing a software update on a QNAP TVS-873 NAS:

    1. Backup your data: Before performing any software update, it is crucial to back up all important data stored on the NAS. This ensures that in case of any issues during the update process, you can restore your data without any loss.
    2. Check compatibility: Ensure that the software update you are planning to install is compatible with your QNAP TVS-873 NAS model. Check the QNAP website or support forum for compatibility information.
    3. Read release notes: Always read the release notes or changelog for the software update. It provides valuable information about new features, bug fixes, and known issues. Understanding the changes in the update can help you prepare and troubleshoot if necessary.
    4. Check system requirements: Verify that your QNAP TVS-873 NAS meets the system requirements for the software update. This includes checking the available storage space, required RAM, and any other hardware or software prerequisites.
    5. Stable network connection: Ensure that your NAS has a stable network connection during the update process. A network interruption or failure can cause the update to fail or corrupt the system.
    6. Update firmware first: If there are any firmware updates available for your QNAP TVS-873 NAS, it is recommended to update the firmware before updating the software. Firmware updates often provide essential system improvements and stability fixes.
    7. Disable services: Before initiating the software update, consider disabling any non-essential services running on the NAS. This can help prevent conflicts or issues during the update process.
    8. Avoid power interruptions: It is crucial to avoid any power interruptions during the software update. Sudden power loss can corrupt the system and lead to data loss or system instability. Ensure that your NAS is connected to a reliable power source and consider using a UPS (Uninterruptible Power Supply) for additional protection.
    9. Monitor the update process: Keep an eye on the update process and monitor any progress indicators or messages provided by the NAS. If any errors or issues occur, take note of them for troubleshooting purposes.
    10. Post-update verification: After the update is complete, verify that all services, applications, and data are functioning as expected. Test critical functionality and access your data to ensure everything is working correctly.

    By following these precautions and best practices, you can minimize the risk of data loss or system instability during a software update on your QNAP TVS-873 NAS.

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