How to recover data from QNAP SS-439 Pro NAS

Is your network drive gone, and you are wondering what to do? Has a RAID system crashed, and your files are no longer accessible? Does your device display an error while booting? Have you accidentally rebuilt your RAID system? Are several hard disks out of order?

How to recover data from NAS QNAP SS-439 Pro

QNAP SS-439 Pro NAS Data Recovery in 2024

In this step-by-step tutorial, we’ll show you how to rebuild your RAID and recover data from SS-439 Pro.

How to recover data from NAS QNAP SS-439 Pro

Recover data from damaged RAID arrays inaccessible from a computer.

Why can’t ordinary software tools restore files from RAID?

Conventional hard disks keep user’s data by writing it to their surface in a consecutive way, and this is how an entire file is stored on a single hard disk. However, when data is written to a RAID system, a file is divided into several parts. Then these parts are written consecutively to all hard disks within such array. The size of such parts may range from 2 KB to 2 MB, so each file is stored on several hard disks at the same time.

Such approach helps to speed up read and write operations, and it is evident that saving two parts of a file having the size of 1 GB to two hard disks simultaneously is much faster than saving the same 1 GB of data to one hard disk. However, this peculiarity makes file recovery more complicated.

Various RAID levels store information in different ways. Additionally, manufacturers like QNAP also introduce some modifications to this process, and that is why data can be written to hard disk in a wide variety of ways.

How can continuous data protection mechanisms help in minimizing potential data loss on NAS QNAP SS-439 Pro devices?

Continuous data protection (CDP) mechanisms can help minimize potential data loss on NAS QNAP SS-439 Pro devices in the following ways:

  1. Real-time data replication: CDP mechanisms continuously replicate data in real-time to a secondary storage device or location. This ensures that any changes made to the data are immediately replicated, reducing the risk of data loss in case of hardware failures or disasters.
  2. Point-in-time recovery: CDP allows for point-in-time recovery, meaning you can restore data to a specific point in time. This is useful in scenarios where data becomes corrupted or accidentally deleted. Instead of relying on traditional backups, CDP allows you to restore the data as it existed at the desired point in time, minimizing data loss.
  3. Automatic backup and versioning: CDP mechanisms automatically create backups of data at regular intervals or whenever changes are made. These backups are typically stored separately from the primary storage, reducing the risk of data loss due to hardware failures or malware attacks. Additionally, CDP often supports versioning, allowing you to restore previous versions of files or folders.
  4. Continuous monitoring and alerts: CDP solutions continuously monitor the NAS device for any potential issues or anomalies. If any problems are detected, such as disk failures or network connectivity issues, alerts are triggered, allowing administrators to take immediate action to prevent data loss.
  5. Rapid recovery: In the event of a data loss incident, CDP mechanisms enable rapid recovery. Since the data is continuously replicated, the recovery process can be initiated quickly, minimizing downtime and reducing the impact on business operations.

Overall, CDP mechanisms provide a proactive approach to data protection, ensuring that data is continuously backed up and readily available for recovery. By minimizing the time between data changes and its replication, CDP helps to minimize potential data loss on NAS QNAP SS-439 Pro devices.

How to take hard disks out of the NAS and connect them to a PC?

Although NAS SS-439 Pro can be accessed over the network, you still need to take the hard disks out of the storage device and connect them to a Windows computer. Only in this case will the software be able to scan them properly. Here is what you should do:

  1. Turn off the storage and disconnect it from the power supply.

    WARNING! Before you start taking hard disks out of your NAS device, read the manual carefully. Incorrect actions may damage your network-attached storage and/or the hard disks within the RAID system.

  2. Take the hard disks out of the NAS one by one, carefully removing them from their slots. Remember that the disks are extremely vulnerable: hitting or dropping them may result in serious physical damage.

  3. Make sure to mark each hard disk in accordance with how they were installed inside the NAS.

  4. Remove the hard disks and connect them to the computer. In this video, we have explored what ports are used to connect hard disks, and what to do if there are not enough ports or connectors.

    Go to view
    How to Order Remote Data Recovery

    How to Order Remote Data Recovery

Restoring data with Hetman RAID Recovery

Hetman Raid Recovery

This program recovers data from damaged RAID arrays and is fully compatible with QNAP SS-439 Pro. The hard disks that make up the RAID contain technical information about the algorithm used to save files. When launched, Hetman RAID Recovery reads this information and puts the damaged array together. Then you can open the disk and save your files. Also, you can recover the files accidentally deleted from the network drive.

Go to view
How to recover data from a QNAP

How to recover data from a QNAP

SS-439 Pro has 4 HDD slots, and it supports the following array types:

  • RAID 6;
  • RAID 5;
  • RAID 10;
  • RAID 0;
  • RAID 1;
  • JBOD;

NAS supports:

  • ZFS;
  • EXT4;
  • EXT3;
  • exFAT;
  • FAT32 (External Disk Only);
  • NTFS (External Disk Only);
  • HFS+ (External Disk Read Only);

Safe recovery from disk images

This utility lets you save an entire copy of the disk to file and then work with this image instead of the actual disk. Such feature helps to protect data on the disk from:

  • Overwriting during the recovery process;
  • Loss resulting from bad sectors;
  • User mistakes.

To create an image, do the following:

  1. Make sure that you have enough free space to save the image. The image file size usually equals the disk size.

  2. Select the disk in the main window, and choose from the menu ToolsSave Disk. You can select multiple disks to be saved.

  3. When the image creation wizard starts, you can choose to save the entire disk or select only a part of it. Specify the parameters and click Next.

    Hetman Raid Recovery: Image Creation Wizard
  4. At this stage, you need to choose a directory where to save the image. Choose any disk connected to this PC, or save the image by FTP.

    Hetman Raid Recovery: hoose any disk connected to this PC, or save the image by FTP

Where are user’s files stored?

The QNAP SS-439 Pro 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.

Comparison of software for RAID recovery

Product Operating system License type RAID controller support Supported file systems Virtual RAID controller support Data recovery from damaged RAID File preview
Hetman RAID Recovery Windows Paid Yes, over 100 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes
DiskInternals RAID Recovery Windows Paid Yes, over 100 controllers FAT, NTFS, Ext2/3/4, HFS+ No Yes Yes
R-Studio Windows, Mac, Linux Paid Yes, over 200 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes
UFS Explorer RAID Recovery Windows, Mac, Linux Paid Yes, over 1,000 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes
EaseUS Data Recovery Windows Paid Yes, over 20 controllers FAT, NTFS, Ext2/3/4, HFS+ No Yes Yes
ReclaiMe Free RAID Recovery Windows Free Yes, over 100 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes


We will be happy to answer your questions!

Comments (3)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 9.08.2022 12:31 #
    If you want to ask a question about data recovery, from NAS SS-439 Pro, feel free to leave a comment!
  • Cameron Dawson
    Cameron Dawson 18.09.2023 05:52 #
    Are there any specific RAID configurations or levels used in NAS QNAP SS-439 Pro devices that may affect data recovery?
    • Hetman Software
      Hetman Software 18.09.2023 06:00 #

      Yes, the QNAP SS-439 Pro supports various RAID configurations and levels that can impact data recovery. The specific configurations available may depend on the firmware version and model of the NAS device. Some of the commonly supported RAID levels include:

      1. RAID 0: This configuration offers maximum storage capacity and performance by striping data across multiple drives. However, it does not provide data redundancy, so if one drive fails, all data is lost.
      2. RAID 1: Also known as disk mirroring, RAID 1 duplicates data across two drives, providing redundancy. If one drive fails, the other drive contains an exact copy of the data, ensuring data availability. Data recovery is relatively straightforward in this configuration.
      3. RAID 5: RAID 5 stripes data across multiple drives and also includes parity information for fault tolerance. If a single drive fails, data can be reconstructed using the parity information. However, if multiple drives fail, data recovery becomes more complex.
      4. RAID 6: Similar to RAID 5, RAID 6 provides striping and double parity for enhanced fault tolerance. It can withstand the failure of two drives simultaneously, making data recovery possible even in such scenarios.
      5. RAID 10: RAID 10 combines mirroring and striping by creating a mirrored set of striped drives. It offers both redundancy and performance benefits. If one drive fails, its mirrored counterpart can be used for data recovery.

      The specific RAID configuration chosen during NAS setup will impact data recovery in case of drive failures. It is recommended to regularly backup data to an external location to ensure data availability and minimize the risk of data loss.

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Vladimir Artiukh

Author: Vladimir Artiukh, Technical Writer

Vladimir Artiukh is a technical writer for Hetman Software, as well as the voice and face of their English-speaking YouTube channel, Hetman Software: Data Recovery for Windows. He handles tutorials, how-tos, and detailed reviews on how the company’s tools work with all kinds of data storage devices.

Oleg Afonin

Editor: Oleg Afonin, Technical Writer

Oleg Afonin is an expert in mobile forensics, data recovery and computer systems. He often attends large data security conferences, and writes several blogs for such resources as, Elcomsoft and Habr. In addition to his online activities, Oleg’s articles are also published in professional magazines. Also, Oleg Afonin is the co-author of a well-known book, Mobile Forensics - Advanced Investigative Strategies.


Questions and answers

  • What are the key features and capabilities of the NAS QNAP SS-439 Pro that make it suitable for use in a surveillance system?

    The NAS QNAP SS-439 Pro has several key features and capabilities that make it suitable for use in a surveillance system:

    1. High-performance hardware: The NAS is equipped with a powerful Intel Atom processor and up to 4GB of RAM, allowing for efficient processing and handling of surveillance data.
    2. Multiple storage options: The NAS supports up to four hard drives, providing ample storage capacity for storing surveillance footage. It also supports various RAID configurations for data redundancy and protection.
    3. Surveillance Station: QNAP's Surveillance Station software is included, offering a comprehensive management and monitoring solution for IP cameras. It supports a wide range of camera models and allows for real-time monitoring, recording, and playback of surveillance footage.
    4. Remote access and monitoring: The NAS supports remote access, allowing users to monitor their surveillance system from anywhere using a web browser or mobile app. This is particularly useful for users who need to keep an eye on their premises while away.
    5. Intelligent video analytics: The Surveillance Station software includes intelligent video analytics features such as motion detection, object recognition, and event notifications. These capabilities enhance the overall surveillance system's effectiveness and efficiency.
    6. Expandability and scalability: The NAS supports additional expansion units, allowing for easy scalability as the surveillance system grows. This ensures that the NAS can accommodate an increasing number of cameras and storage requirements.
    7. High-speed connectivity: The NAS supports Gigabit Ethernet and USB 3.0 ports, facilitating fast data transfer between the NAS and connected devices. This is crucial for real-time monitoring and recording of high-resolution surveillance footage.

    Overall, the NAS QNAP SS-439 Pro offers a robust and feature-rich solution for surveillance systems, providing reliable storage, efficient processing, and comprehensive management capabilities.

  • How does the NAS QNAP SS-439 Pro ensure the security and reliability of the surveillance footage stored on the system?

    The NAS QNAP SS-439 Pro ensures the security and reliability of the surveillance footage stored on the system through various mechanisms:

    1. RAID Configuration: The SS-439 Pro supports RAID configurations (e.g., RAID 1, 5, 6) that provide data redundancy. This means that even if one or more hard drives fail, the system can still operate without losing the stored footage.
    2. Snapshot Protection: The NAS supports snapshot technology, which allows users to create point-in-time copies of data. This feature ensures that even if the original footage is accidentally modified or deleted, a previous version can be restored.
    3. Data Encryption: The SS-439 Pro supports AES 256-bit encryption, which can be applied to the stored surveillance footage. This ensures that even if the physical drives are stolen or accessed by unauthorized individuals, the data remains encrypted and inaccessible.
    4. Access Control: The NAS provides robust access control mechanisms, allowing administrators to define user permissions and access rights. This ensures that only authorized individuals can view, modify, or delete the surveillance footage.
    5. Network Security: The SS-439 Pro supports various network security protocols, such as SSL/TLS encryption, IP blocking, and firewall settings. These measures protect the system from unauthorized access and ensure secure communication between the NAS and connected devices.
    6. Surveillance Station App: QNAP's Surveillance Station app provides advanced surveillance features, including motion detection, event management, and camera access control. It allows users to monitor and manage the surveillance footage with ease, enhancing the overall security and reliability of the system.

    By combining these security and reliability features, the NAS QNAP SS-439 Pro ensures the integrity and availability of the surveillance footage stored on the system.

  • Can the NAS QNAP SS-439 Pro support multiple IP cameras simultaneously, and what are the recommended specifications for the cameras to ensure optimal performance?

    Yes, the QNAP SS-439 Pro NAS can support multiple IP cameras simultaneously. The number of cameras it can support will depend on the specific model and the available resources.

    To ensure optimal performance, it is recommended to consider the following specifications for the IP cameras:

    1. Resolution: Higher resolution cameras will require more processing power and bandwidth. It is advisable to choose cameras with a resolution that matches your requirements while considering the NAS capabilities.
    2. Compression: Cameras that support efficient video compression formats like H.264 or H.265 will help reduce the bandwidth and storage requirements.
    3. Frame rate: The frame rate determines the smoothness of the video. Lower frame rates may result in choppy videos, while higher frame rates will require more resources. It is recommended to choose cameras with a frame rate that suits your monitoring needs.
    4. Bitrate: The bitrate determines the amount of data required to transmit the video stream. Higher bitrates will require more bandwidth and storage space. It is advisable to choose cameras with adjustable bitrate settings to optimize performance.
    5. Network bandwidth: Ensure that your network infrastructure can handle the combined bandwidth of all the cameras. Gigabit Ethernet or higher is recommended for optimal performance.
    6. NAS specifications: Consider the processing power, memory, and storage capacity of the NAS. Higher-end NAS models with faster CPUs, more memory, and larger storage capacities will be able to handle more cameras and provide better performance.

    It is always recommended to consult the QNAP website or contact their support team for specific recommendations based on your requirements and the capabilities of your NAS model.

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