Preventing Data Loss on NAS Thecus N8810U and Recovering Deleted Files: Ultimate Strategy

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS Thecus N8810U
• 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 Thecus 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.

How can the use of specific file-sharing protocols impact data loss risks on NAS Thecus N8810U devices?

The use of specific file-sharing protocols can impact data loss risks on NAS Thecus N8810U devices in the following ways:

1. Encryption: Some file-sharing protocols, such as Secure File Transfer Protocol (SFTP) or Secure Shell (SSH), provide encryption capabilities to protect data during transit. This reduces the risk of data interception and unauthorized access, thereby minimizing data loss risks.
2. Access Control: Certain file-sharing protocols, like Network File System (NFS) or Server Message Block (SMB), offer access control mechanisms. By properly configuring access permissions and user authentication, the risk of unauthorized users accessing or modifying data on the NAS device is reduced, minimizing the potential for data loss.
3. Data Integrity: Protocols like File Transfer Protocol (FTP) lack built-in mechanisms to ensure data integrity during transfer. This can lead to corrupted or incomplete files, increasing the risk of data loss. Using protocols with built-in integrity checks, such as BitTorrent Sync or Resilio Sync, can mitigate this risk by verifying data integrity.
4. Vulnerabilities: Different file-sharing protocols may have varying levels of vulnerability to security threats. Some protocols may have well-known vulnerabilities that can be exploited by attackers to gain unauthorized access or cause data loss. Choosing protocols with strong security measures and staying up to date with protocol-specific security patches can help minimize these risks.
5. Backup and Recovery: Certain file-sharing protocols may offer features for automated backup and recovery, such as versioning or snapshot capabilities. These features can enhance data protection by allowing users to easily restore previous versions of files or recover from data loss incidents.

It is important to carefully evaluate the specific file-sharing protocols used on Thecus N8810U devices and consider their impact on data loss risks. Implementing a combination of secure protocols, access controls, data integrity measures, and regular backups can significantly reduce the likelihood of data loss on NAS devices.

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

Although the NAS N8810U 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 Thecus N8810U. 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 Thecus

N8810U has 8 HDD slots, and it supports the following array types:

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

NAS supports:

• EXT3;
• EXT4;
• XFS;

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 Thecus N8810U 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