How to Identify and Recover from Mechanical and Logical Failures in NAS QNAP NVR-104V RAID Arrays

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS QNAP NVR-104V
• 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 QNAP 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 the number of drives in a NAS QNAP NVR-104V device's RAID array impact data recovery and potential loss?

The number of drives in a NAS QNAP NVR-104V device's RAID array can impact data recovery and potential loss in the following ways:

1. Data redundancy: RAID arrays are designed to provide redundancy by distributing data across multiple drives. The more drives in the array, the higher the level of redundancy. With more drives, the RAID array can tolerate the failure of one or more drives without losing data. This improves data recovery chances as the failed drive(s) can be replaced, and the array can be rebuilt using the data from the remaining drives.
2. Fault tolerance: RAID arrays with more drives can provide higher fault tolerance. Different RAID levels offer different levels of fault tolerance, such as RAID 1, RAID 5, RAID 6, etc. With more drives in the array, you can choose a RAID level that offers better protection against drive failures. This reduces the risk of data loss and improves the chances of successful data recovery.
3. Rebuild time: When a drive fails in a RAID array, the array needs to be rebuilt using the data from the remaining drives. The time required for this rebuild process increases with the number of drives in the array. During this rebuild process, the array is vulnerable, and if another drive fails, it can lead to data loss. Therefore, larger RAID arrays may have a longer rebuild time, increasing the risk of potential data loss.
4. Backup strategy: The number of drives in a RAID array should not be solely relied upon as a backup strategy. RAID provides redundancy and fault tolerance, but it is not a substitute for regular backups. It is crucial to have a separate backup solution in place to protect against data loss due to various factors like hardware failure, accidental deletion, or malware.

In summary, having more drives in a NAS QNAP NVR-104V device's RAID array can improve data recovery chances and reduce the risk of data loss due to drive failures. However, it is essential to have a comprehensive backup strategy in place to ensure data protection.

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

Although the NAS NVR-104V 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 QNAP NVR-104V. 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 QNAP

NVR-104V has 1 HDD slots, and it supports the following array types:

• Q-RAID 1;

NAS supports:

• FAT32 (External Disk Only);
• NTFS (External Disk Only);
• HFS+ (External Disk Read Only);

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 QNAP NVR-104V network-attached storage keeps QTS (QuTS hero) 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