Key Features of NAS QNAP TVS-872XU Data Recovery for Home Users

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS QNAP TVS-872XU
• How to Remove Hard Disks from Your NAS and Connect Them to a PC
  • Step-by-Step Data Recovery with Hetman RAID Recovery
  • How to Safely Recover Data from Disk Images
  • Where Are the User’s Files Actually Stored?
  • RAID Recovery Software: Detailed Comparison

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 QNAP 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.

Are there any recommended steps to take after detecting or suspecting data loss on a NAS QNAP TVS-872XU device?

If you suspect or detect data loss on a QNAP TVS-872XU NAS device, here are some recommended steps to take:

1. Stop using the NAS: As soon as you suspect data loss, stop all operations on the NAS device to prevent any further damage or overwriting of data.
2. Verify the data loss: Check if the data is actually lost or inaccessible. Ensure that the issue is not due to a network problem, misconfiguration, or user error.
3. Contact QNAP support: Reach out to QNAP support for assistance. Provide them with detailed information about the problem, any error messages received, and the steps you have taken so far.
4. Perform basic troubleshooting: QNAP support might guide you through basic troubleshooting steps to determine the cause of data loss and potential solutions.
5. Check hardware and connections: Verify that all hardware components, cables, and connections are properly connected and working. A faulty connection or hardware issue could cause data loss or inaccessibility.
6. Check storage pool and volume status: Use the QNAP management interface to check the status of your storage pool and volumes. Ensure that they are healthy and not in a degraded state.
7. Run data recovery tools: If the data loss is confirmed, QNAP support might recommend using their data recovery tools or suggest third-party data recovery software to attempt recovering the lost data. Follow their instructions carefully.
8. Restore from backup: If you have a recent backup of your data, restore it to the NAS device. This will help you recover your lost data quickly and efficiently.
9. Learn from the incident: Analyze the cause of the data loss incident and take steps to prevent it from happening again in the future. This may include implementing backup strategies, redundant storage configurations, or better data management practices.

Remember, it is crucial to seek guidance from QNAP support as they are experts in dealing with their specific devices and can provide tailored assistance based on your situation.

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

Although the NAS TVS-872XU 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.

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   How to Order Remote Data Recovery

Step-by-Step Data Recovery with Hetman RAID Recovery

This program restores data from damaged RAID arrays and is fully compatible with QNAP TVS-872XU. 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.

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How to recover data from a QNAP

TVS-872XU 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);

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.

   

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.

   

Where Are the User’s Files Actually Stored?

The QNAP TVS-872XU 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.

RAID Recovery Software: Detailed Comparison