RAID Array Recovery on NAS Thecus N4100PRO: Steps to Recover Your Data When It Breaks

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS Thecus N4100PRO
• 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.

Are there any specific network security measures to implement for safeguarding NAS Thecus N4100PRO devices against data loss?

Yes, there are several network security measures that can be implemented to safeguard NAS Thecus N4100PRO devices against data loss. Here are some important ones:

1. Secure Passwords: Ensure that strong and unique passwords are used for all user accounts, including the administrator account. Avoid using default or easily guessable passwords.
2. Firmware Updates: Regularly update the firmware of the NAS device to ensure that it has the latest security patches and bug fixes. Check the manufacturer's website for updates.
3. Firewall Configuration: Enable and configure a firewall on the NAS device to restrict unauthorized access to the network. Only allow necessary services and ports to be accessible from the internet.
4. User Access Control: Implement proper user access control by assigning appropriate permissions and access levels to different users. Restrict access to sensitive data and folders.
5. Network Segmentation: Segment your network and place the NAS device in a separate network segment, isolated from other sensitive systems. This helps to minimize the impact of a potential breach.
6. Encryption: Enable data encryption on the NAS device to protect the data stored on it. This ensures that even if the device is stolen or compromised, the data remains unreadable.
7. Backup and Disaster Recovery: Regularly backup the data stored on the NAS device to an off-site location or another NAS device. Implement a proper disaster recovery plan to ensure data can be restored in case of data loss or device failure.
8. Antivirus and Malware Protection: Install and regularly update antivirus and anti-malware software on the NAS device to detect and prevent any malicious software or files from infecting the device.
9. Disable Unused Services: Disable any unnecessary services or protocols on the NAS device to minimize potential attack vectors. Only enable the services that are required for your specific use case.
10. Regular Monitoring and Auditing: Monitor the NAS device for any suspicious activity or unauthorized access attempts. Enable logging and regularly review the logs for any security incidents.

It is important to note that these measures should be implemented in conjunction with other network security best practices to ensure comprehensive protection against data loss and unauthorized access.

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

Although the NAS N4100PRO 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 N4100PRO. 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

N4100PRO has 4 HDD slots, and it supports the following array types:

• RAID 0;
• RAID 1;
• RAID 5;
• RAID 6;
• 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 N4100PRO 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