How to Access Files on a RAID Disk When NAS Uniview DE1848-V2 is Not Functioning: Comprehensive Guide

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS Uniview DE1848-V2
• 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 Uniview 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.

Can remote access to NAS Uniview DE1848-V2 devices pose additional data loss risks?

Remote access to NAS Uniview DE1848-V2 devices can potentially pose additional data loss risks if proper security measures are not in place. Here are a few potential risks:

1. Unauthorized access: If remote access is not properly secured with strong authentication and encryption, it can be vulnerable to unauthorized access. Hackers or malicious actors can exploit these vulnerabilities to gain access to the NAS device and potentially steal or delete data.
2. Weak passwords: If weak passwords are used for remote access, it becomes easier for attackers to guess or crack them, granting them unauthorized access to the device and its data.
3. Network vulnerabilities: If the network used for remote access is not properly secured, it can expose the NAS device to various network-based attacks, such as man-in-the-middle attacks or packet sniffing. These attacks can intercept and manipulate data, leading to potential data loss.
4. Malware and ransomware: Remote access can provide an entry point for malware or ransomware attacks. If a remote user's device is infected, it can spread malware to the NAS device, potentially leading to data loss or encryption of data for ransom.

To mitigate these risks, it is important to follow best practices for securing remote access to NAS devices:

• Use strong, unique passwords for remote access accounts.
• Enable two-factor authentication for an extra layer of security.
• Ensure that remote access protocols, such as SSH or VPN, are properly configured and encrypted.
• Regularly update the NAS device's firmware and software to patch any security vulnerabilities.
• Implement network security measures, such as firewalls and intrusion detection systems, to protect against network-based attacks.
• Use antivirus and anti-malware software to detect and prevent malware infections.
• Regularly back up the data stored on the NAS device to an off-site location to mitigate the impact of data loss.

By following these security practices, the risks associated with remote access to NAS Uniview DE1848-V2 devices can be significantly reduced.

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

Although the NAS DE1848-V2 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 Uniview DE1848-V2. 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 Uniview

DE1848-V2 has 48 HDD slots, and it supports the following array types:

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

NAS supports:

• exFAT, VFAT, FAT 12 / 16 / 32;
• NTFS / ReFS;
• APFS / HFS+;
• Ext2 / 3 / 4 / ReiserFS / XFS / UFS / ZFS / Btrfs;
• VMFS / HikvisionFS;

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 Uniview DE1848-V2 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