How to recover data from Thecus N8810U NAS

Contents

• Why can’t ordinary software tools restore files from RAID?
• How to take hard disks out of the NAS and connect them to a PC?
  • Restoring data with Hetman RAID Recovery
  • Safe recovery from disk images
  • Where are user’s files stored?
  • Comparison of software for RAID recovery

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

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

Although NAS N8810U 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.

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   How to Order Remote Data Recovery

Restoring data with Hetman RAID Recovery

This program recovers data from damaged RAID arrays and is fully compatible with Thecus N8810U. 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.

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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;

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 Tools – Save 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.

   

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.

   

Where are user’s files 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.

Comparison of software for RAID recovery