Mastering NAS Digiever DS-645256-RM Pro+ Data Recovery: Essential RAID Array Tips

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS Digiever DS-645256-RM Pro+
• 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 quality of service (QoS) settings impact data transfer reliability on NAS Digiever DS-645256-RM Pro+ devices?

Quality of Service (QoS) settings can have a significant impact on data transfer reliability on NAS Digiever DS-645256-RM Pro+ devices. Here are a few ways QoS settings can affect data transfer reliability:

1. Bandwidth allocation: QoS settings allow you to allocate bandwidth to different applications or services based on their priority. By prioritizing data transfer protocols or applications, you can ensure that critical data transfers receive sufficient bandwidth, reducing the chances of congestion or packet loss.
2. Traffic shaping: QoS settings enable traffic shaping, which allows you to control and regulate the flow of data packets. By shaping the traffic, you can prevent network congestion and prioritize certain types of data transfers, ensuring reliable and consistent data transfer rates.
3. Latency management: QoS settings can help manage latency, which is the delay between sending and receiving data packets. By prioritizing real-time data transfers or reducing latency for critical applications, you can improve the reliability of time-sensitive data transfers.
4. Error handling: QoS settings can include error handling mechanisms that detect and recover from transmission errors. By implementing error detection and correction techniques, you can enhance the reliability of data transfers, minimizing the chances of data corruption or loss.
5. Traffic prioritization: QoS settings allow you to prioritize certain types of traffic over others. For example, you can prioritize data transfers related to critical business operations over non-essential traffic like file downloads or streaming. This ensures that important data transfers are given higher priority, improving their reliability.

By configuring QoS settings appropriately on NAS Digiever DS-645256-RM Pro+ devices, you can optimize data transfer reliability, reduce network congestion, and ensure that critical data transfers are prioritized and delivered efficiently.

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

Although the NAS DS-645256-RM Pro+ 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-645256-RM Pro+. 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-645256-RM Pro+ has 60 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 Digiever DS-645256-RM Pro+ 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