NAS Digiever DS-4125-RM Data Recovery: How to Handle RAID Array Challenges

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS Digiever DS-4125-RM
• 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 a NAS Digiever DS-4125-RM device's cache settings impact data loss risks?

The cache settings on a Digiever DS-4125-RM NAS device can impact data loss risks in the following ways:

1. Write Cache: The device's write cache is used to temporarily store data before it is written to the hard drives. If the write cache is enabled and data is only stored in the cache without being written to the hard drives, there is a risk of data loss in case of power failure or system crash. It is important to ensure that the write cache is properly flushed and data is safely written to the hard drives to minimize the risk of data loss.
2. Read Cache: The read cache stores frequently accessed data in memory for faster access. While the read cache can improve performance, it can also increase the risk of data loss if the cached data becomes corrupted or outdated. It is essential to regularly check and validate the integrity of the cached data to minimize the risk of data loss.
3. Cache Size: The size of the cache can impact data loss risks. If the cache size is too small, it may lead to frequent cache evictions, resulting in slower performance and increased disk I/O, which can increase the risk of data loss due to delays in writing or reading data. On the other hand, if the cache size is too large, it may increase the risk of data loss in case of power failure or system crash, as a larger amount of data needs to be written from the cache to the hard drives.
4. Cache Backup: Some NAS devices offer the option to back up the cache to a separate storage device or RAID array. This can provide an additional layer of protection against data loss in case of cache failure or corruption. Enabling cache backup can help minimize the risk of data loss by ensuring that the cached data is stored in a redundant and secure location.

Overall, it is important to carefully configure and monitor the cache settings on a Digiever DS-4125-RM NAS device to minimize the risk of data loss. Regular backups, proper cache flushing, and validation of cached data integrity are crucial steps to ensure data safety.

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

Although the NAS DS-4125-RM 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 DS-4125-RM. 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

DS-4125-RM 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 DS-4125-RM 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