NAS Digiever DA-4000E Data Recovery: Streamlined RAID Array Tips

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS Digiever DA-4000E
• 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 Digiever 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 RAID (Redundant Array of Independent Disks) configurations impact data loss in NAS Digiever DA-4000E devices?

RAID configurations can significantly impact data loss in NAS Digiever DA-4000E devices by providing data redundancy and improved data availability. Here are some ways RAID configurations can impact data loss:

1. Data Redundancy: RAID configurations, such as RAID 1 (mirroring) or RAID 5 (striping with parity), create duplicate copies of data across multiple disks. In the event of a disk failure, the redundant data ensures that the system can still access and retrieve the data from the remaining disks, minimizing the risk of data loss.
2. Fault Tolerance: RAID configurations offer fault tolerance by distributing data across multiple disks. If a disk fails, the system can continue to operate without interruption, as the data can be reconstructed from the remaining disks using parity information. This reduces the risk of data loss due to hardware failures.
3. Hot Spare: Some RAID configurations, like RAID 5 with a hot spare, allow for automatic disk replacement. When a disk fails, the hot spare is automatically activated and takes over the failed disk's role, ensuring that data is continuously available and reducing the time window for potential data loss.
4. Rebuild Capability: RAID configurations support disk rebuilding, which involves replacing a failed disk with a new one and reconstructing the data from the remaining disks. This process helps restore the redundancy and data integrity of the RAID array, minimizing the risk of data loss during disk replacement.
5. Data Protection: RAID configurations can provide protection against data loss caused by accidental deletion or file corruption. Some RAID levels, like RAID 1 or RAID 10, create exact copies of data on multiple disks, ensuring that if one copy is compromised, the other remains intact.

It's important to note that while RAID configurations can greatly reduce the risk of data loss, they are not foolproof. They primarily protect against hardware failures and certain types of data corruption, but they may not safeguard against other factors like natural disasters, human errors, or malware attacks. Therefore, it's still crucial to implement regular backups and other data protection measures in conjunction with RAID configurations to ensure comprehensive data loss prevention.

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

Although the NAS DA-4000E 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 Digiever DA-4000E. 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 Digiever

DA-4000E has 4 HDD slots, and it supports the following array types:

• RAID 0;
• RAID 1;
• RAID 5;
• RAID 6;
• 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 Digiever DA-4000E 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