How to Avoid Data Loss on NAS Thecus N7710 and Retrieve Deleted Data

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.

Are there any specific precautions to take while migrating data between NAS Thecus N7710 devices?

Yes, there are a few precautions to take while migrating data between NAS Thecus N7710 devices:

1. Backup your data: Before starting the migration process, it is important to back up all your data from the source NAS device. This ensures that even if something goes wrong during the migration, your data remains safe.
2. Check firmware compatibility: Ensure that both the source and destination NAS devices are running the same or compatible firmware versions. This ensures a smooth migration process and avoids any potential compatibility issues.
3. Verify network connectivity: Make sure that both NAS devices are connected to the network and can communicate with each other. This can be done by pinging the IP addresses of both devices or accessing their web interfaces.
4. Plan the migration process: Create a plan or checklist outlining the steps you need to follow during the migration process. This can include tasks such as creating shared folders, configuring user permissions, and transferring data.
5. Test the migration process: Before migrating all your data, it is recommended to perform a test migration with a small amount of data. This helps identify any potential issues or errors that may arise during the actual migration.
6. Monitor the migration process: During the migration, keep an eye on the process to ensure that it is progressing smoothly. Monitor the transfer speed, check for any error messages, and verify that all data is being successfully migrated.
7. Verify data integrity: After the migration is complete, verify the integrity of the migrated data. This can be done by comparing file sizes, checksums, or performing test restores of critical files.

By following these precautions, you can minimize the risk of data loss or errors during the migration process between NAS Thecus N7710 devices.

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

Although NAS N7710 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 N7710. 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

N7710 has 7 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 N7710 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