How to recover data from QNAP TVS-871T 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-871T

QNAP TVS-871T 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-871T.

How to recover data from NAS QNAP TVS-871T

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.

Can a failed RAID rebuild process lead to data loss on NAS QNAP TVS-871T devices?

Yes, a failed RAID rebuild process can potentially lead to data loss on NAS QNAP TVS-871T devices. During a RAID rebuild, the system is reconstructing the data on the failed or replaced disk by using parity information from the remaining disks in the array. If there are any issues or errors during this process, such as multiple disk failures, incorrect configuration, or hardware problems, it can result in data loss or corruption. It is crucial to ensure proper backup procedures and seek professional assistance if encountering any difficulties during a RAID rebuild process.

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

Although NAS TVS-871T 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-871T. 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-871T 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-871T 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-871T, feel free to leave a comment!
  • Cody Stanton
    Cody Stanton 17.09.2023 05:51 #
    Can data recovery from a NAS QNAP TVS-871T device be done if the device is experiencing intermittent connectivity issues?
    • Hetman Software
      Hetman Software 17.09.2023 05:59 #

      Yes, data recovery from a NAS QNAP TVS-871T device can be done even if the device is experiencing intermittent connectivity issues. However, the process might be more complex and time-consuming compared to recovering data from a fully functional device.

      Here are a few steps you can take to recover data from a NAS device with intermittent connectivity issues:

      1. Troubleshoot the connectivity issues: Try to diagnose and fix the intermittent connectivity problems. Ensure that the network cables, switches, and routers are functioning properly. Restart the NAS device and check for any firmware updates or known issues that might be causing the problem.
      2. Use alternative connectivity methods: If the NAS device supports multiple connectivity options (e.g., Ethernet, Wi-Fi, USB), try using a different connection method to access the device. For example, if you are experiencing issues with Ethernet connectivity, try connecting via Wi-Fi or USB.
      3. Use data recovery software: If you can establish a stable connection to the NAS device, use data recovery software specifically designed for NAS devices to recover your files. QNAP provides its own data recovery software called "Qnap Data Recovery" that can be used to recover data from QNAP NAS devices.
      4. Seek professional help: If you are unable to establish a stable connection or recover the data using software, it is recommended to seek professional help from a data recovery service provider. They have specialized tools and expertise to recover data from faulty NAS devices.

      Remember to avoid further modifying or writing data to the NAS device until the data recovery process is complete, as it may overwrite or damage the existing data.

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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 do I configure the network settings on the QNAP TVS-871T NAS device?

    To configure the network settings on the QNAP TVS-871T NAS device, follow these steps:

    1. Connect your NAS device to your network using an Ethernet cable. Ensure that the cable is securely plugged into both the NAS device and your router or switch.
    2. Power on the NAS device and wait for it to fully boot up.
    3. Access the QNAP NAS web interface by opening a web browser on a computer connected to the same network as the NAS device.
    4. In the address bar of the web browser, enter the IP address of the NAS device. The default IP address of the QNAP NAS is often "" or "http://NAS-IP-Address" (replace "NAS-IP-Address" with the actual IP address of your NAS).
    5. Enter your NAS device's username and password when prompted. The default username is "admin," and the default password is "admin" as well. If you have changed the login credentials, use the updated username and password.
    6. Once logged in, navigate to the "Control Panel" section of the web interface.
    7. In the Control Panel, locate and click on the "Network & Virtual Switch" option.
    8. In the Network & Virtual Switch settings, you can configure various network-related settings, such as IP addresses, DHCP, VLAN, and more.
    9. Click on the "Interfaces" tab to configure the network interface settings. Here, you can set the IP address, subnet mask, default gateway, DNS servers, and other network-related parameters.
    10. If you want to use DHCP to automatically assign an IP address to the NAS device, select the "Obtain IP address settings automatically via DHCP" option.
    11. If you want to manually assign an IP address to the NAS device, select the "Static IP" option and enter the desired IP address, subnet mask, default gateway, and DNS server addresses.
    12. Click "Apply" or "Save" to save the changes.

    After configuring the network settings, the QNAP TVS-871T NAS device should be connected to your network with the specified network settings.

  • What are the recommended settings for optimizing performance on the QNAP TVS-871T NAS?

    To optimize performance on the QNAP TVS-871T NAS, you can follow these recommended settings:

    1. RAID Configuration: Use RAID 5 or RAID 6 for optimal performance and data protection.
    2. SSD Caching: Enable SSD caching to accelerate data access. Use high-quality SSDs for caching.
    3. Network Configuration: Connect the NAS to your network using a high-speed Ethernet connection (at least 1 Gbps). Use Link Aggregation (802.3ad) to combine multiple network interfaces for increased bandwidth.
    4. File System: Format the NAS drives with the recommended file system. For most use cases, the recommended file system is EXT4.
    5. Memory Upgrade: If your NAS is running out of memory during heavy usage, consider upgrading the RAM to improve performance.
    6. Firmware Updates: Keep the NAS firmware up to date to benefit from bug fixes, stability improvements, and performance enhancements.
    7. Power Management: Adjust the power management settings to balance performance and energy consumption. You can configure the NAS to enter sleep mode during periods of inactivity.
    8. Application Optimization: Disable unnecessary services and applications that you don't use to free up system resources and improve performance.
    9. Enable SSD TRIM: If you have SSDs installed in your NAS, enable the TRIM feature to maintain the long-term performance of the SSDs.
    10. Backup and Maintenance: Regularly backup your data and perform routine maintenance tasks like disk checks and defragmentation to ensure optimal performance.

    Remember to consult the QNAP TVS-871T user manual or contact QNAP support for detailed instructions on configuring these settings.

  • How can I set up user access control and permissions on the QNAP TVS-871T NAS?

    To set up user access control and permissions on the QNAP TVS-871T NAS, follow these steps:

    1. Log in to the QNAP NAS web interface using your admin credentials.
    2. Go to "Control Panel" and click on "Privilege Settings."
    3. In the "Users" tab, click on "Create" to add a new user. Fill in the required details such as username, password, and group membership.
    4. To create a new user group, go to the "User Groups" tab and click on "Create." Assign a name to the group and specify the desired group permissions.
    5. Once the user and user group are created, you can assign permissions to them. Go to the "Shared Folders" tab and select the folder you want to set permissions for.
    6. Click on "Permissions" and choose the user or user group you want to set permissions for. You can then assign read, write, or deny permissions as needed.
    7. Additionally, you can set advanced permissions by clicking on the "Advanced Permissions" button. This allows you to set more granular access control, including subfolder permissions and special permissions.
    8. Repeat the process for other shared folders or users as required.
    9. To further enhance security, you can enable features like IP blocking, account lockout, and password policies in the "Account" tab of the "Privilege Settings" section.
    10. Once all the permissions are set, click on "Apply" to save the changes.

    By following these steps, you can effectively manage user access control and permissions on your QNAP TVS-871T NAS.

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