
- Why Regular Data Recovery Tools Can’t Restore Files from RAID
- Key Information About the NAS Netgear ReadyNAS RN3138
- How to Remove Hard Disks from Your NAS and Connect Them to a PC
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 Netgear 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.
What are the risks of data loss due to firmware or software malfunctions in NAS Netgear ReadyNAS RN3138 devices?
There are several risks of data loss due to firmware or software malfunctions in NAS Netgear ReadyNAS RN3138 devices. Some of the key risks include:
- Corrupted or inaccessible data: Firmware or software malfunctions can lead to data corruption or make the data inaccessible. This can result in the loss of important files, documents, or other critical data stored on the NAS device.
- System instability: Malfunctions in the firmware or software can cause system instability, leading to frequent crashes or freezes. This can disrupt the normal functioning of the NAS device and potentially result in data loss.
- Failed backups: NAS devices are often used for data backup purposes. If the firmware or software malfunctions, it can affect the backup process, leading to failed or incomplete backups. This can be particularly problematic if the primary data source becomes corrupted or lost.
- Data integrity issues: Firmware or software malfunctions can compromise the integrity of the stored data. This means that the data may become altered, modified, or even deleted unintentionally. Such issues can lead to data loss or inaccurate information.
- Limited recovery options: In case of firmware or software malfunctions, the recovery options may be limited or difficult to execute. This can make it challenging to restore the data or recover from the malfunction, potentially resulting in permanent data loss.
- Vulnerabilities to cyber threats: Malfunctions in firmware or software can create vulnerabilities that can be exploited by cybercriminals. This can lead to unauthorized access, data breaches, or even ransomware attacks, resulting in data loss or theft.
To mitigate these risks, it is important to regularly update the firmware and software of the NAS device, maintain proper backups, implement security measures like firewalls and strong passwords, and monitor the device for any signs of malfunction.
How to Remove Hard Disks from Your NAS and Connect Them to a PC
Although the NAS ReadyNAS RN3138 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:
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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.
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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.
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Label each hard disk according to its position inside the NAS. The order of the drives is crucial for correct RAID reconstruction.
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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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Step-by-Step Data Recovery with Hetman RAID Recovery

This program restores data from damaged RAID arrays and is fully compatible with Netgear ReadyNAS RN3138. 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.
How to recover data from a Netgear
ReadyNAS RN3138 has 4 HDD slots, and it supports the following array types:
- RAID 0;
- X-RAID;
- RAID 1;
- RAID 5;
- RAID 6;
- JBOD;
NAS supports:
- Ext2;
- Ext3;
- Ext4;
- Btrfs;
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:
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Ensure you have enough free space to store the image. Its size will typically match the size of the original disk.
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In the main window, select the target disk and choose Tools - Save Disk. You can also select multiple disks if needed.
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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.

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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 Netgear ReadyNAS RN3138 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
| Product | Operating system | RAID controller support | Supported file systems | Virtual RAID controller support | Data recovery from damaged RAID | File preview |
|---|---|---|---|---|---|---|
| Hetman RAID Recovery | Windows, Linux, MacOS | Yes, over 100 controllers | FAT, exFAT, NTFS, ReFS, APFS, HFS+, Ext4, Ext3, Ext2, ReiserFS, Btrfs, VMFS, Hikvision, XFS, UFS, ZFS | Yes | Yes | Yes |
| DiskInternals RAID Recovery | Windows | Yes, over 10 controllers | FAT, NTFS, Ext2/3/4, HFS+ | No | Yes | Yes |
| R-Studio | Windows, Mac, Linux | Yes, over 20 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |
| UFS Explorer RAID Recovery | Windows, Mac, Linux | Yes, over 100 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |
| EaseUS Data Recovery | Windows | Yes, over 20 controllers | FAT, NTFS, Ext2/3/4, HFS+ | No | Yes | Yes |
| ReclaiMe Free RAID Recovery | Windows | Yes, over 100 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |


Yes, data recovery from a NAS Netgear ReadyNAS RN3138 device can still be possible even if the device is not responding or freezing frequently. However, it may require specialized data recovery services or software tools.
Here are a few steps you can try to recover data from a non-responsive or freezing NAS device:
Remember to always have regular backups of your important data to avoid data loss situations.