How to recover data from Asustor LOCKERSTOR 4RS 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 Asustor LOCKERSTOR 4RS

Asustor LOCKERSTOR 4RS NAS Data Recovery in 2024

In this step-by-step tutorial, we’ll show you how to rebuild your RAID and recover data from LOCKERSTOR 4RS.

How to recover data from NAS Asustor LOCKERSTOR 4RS

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 Asustor also introduce some modifications to this process, and that is why data can be written to hard disk in a wide variety of ways.

Are there any specific precautions to take while migrating data between NAS Asustor LOCKERSTOR 4RS devices?

Yes, there are some precautions to take while migrating data between NAS Asustor LOCKERSTOR 4RS devices. Here are a few important ones:

  1. Backup Data: Before starting the migration process, it is highly recommended to create a backup of all the important data on the source NAS device. This will ensure that you have a copy of the data in case anything goes wrong during the migration.
  2. Check Compatibility: Ensure that the destination NAS device (LOCKERSTOR 4RS) is compatible with the source NAS device in terms of firmware version, hardware specifications, and supported features. Refer to the manufacturer's documentation or contact their support team for compatibility details.
  3. Network Connectivity: Make sure that both the source and destination NAS devices are connected to the same network and have proper network connectivity. This will ensure smooth data transfer during the migration process.
  4. Synchronize Data: Use the synchronization feature provided by Asustor to ensure that all the data on the source NAS device is up to date and synchronized with the destination NAS device. This will help in avoiding any data loss or inconsistencies during the migration.
  5. Plan Downtime: Depending on the amount of data being migrated, the migration process may take some time. Plan for a maintenance window or downtime during which the migration can be performed without affecting the normal operation of the NAS devices.
  6. Test the Migration: If possible, perform a test migration with a small amount of data to ensure that the process works as expected and there are no issues. This will help in identifying any potential problems before migrating the entire dataset.
  7. Seek Professional Assistance: If you are not familiar with the migration process or if you have any doubts, it is recommended to seek assistance from a professional or contact the Asustor support team for guidance. They can provide specific instructions and help troubleshoot any issues that may arise during the migration.

Remember, data migration is a critical process, and taking necessary precautions will help ensure a smooth and successful migration without any data loss or disruptions.

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

Although NAS LOCKERSTOR 4RS 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 Asustor LOCKERSTOR 4RS. 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 Asustor

How to recover data from a Asustor

LOCKERSTOR 4RS has 4 HDD slots, and it supports the following array types:

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

NAS supports:

  • Ext2;
  • Ext3;
  • Ext4;

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 Asustor LOCKERSTOR 4RS 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.

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 LOCKERSTOR 4RS, feel free to leave a comment!
  • Bubby Haig
    Bubby Haig 11.09.2023 23:46 #
    Can data recovery from a NAS Asustor LOCKERSTOR 4RS device be done if the device is not accessible or not recognized by the network?
    • Hetman Software
      Hetman Software 12.09.2023 00:00 #

      If the NAS Asustor LOCKERSTOR 4RS device is not accessible or not recognized by the network, data recovery may still be possible, but it can be more challenging. Here are a few steps you can try to recover data from the device:

      1. Power cycle the device: Turn off the NAS and unplug it from the power source. Wait for a few minutes and then plug it back in and power it on. Sometimes, a simple restart can resolve connectivity issues.
      2. Check network connections: Ensure that the NAS device is properly connected to the network. Verify the Ethernet cables, network switch, or router connections. You can also try connecting the device directly to a computer to see if it is recognized.
      3. Use a different network port or cable: If you suspect a faulty network port or cable, try using a different one to connect the NAS device to the network.
      4. Check network settings: Access the router or network settings to ensure that the NAS device is assigned a valid IP address and is not blocked by any firewall or security settings.
      5. Reset network settings: If you have access to the NAS device's administration interface, you can try resetting the network settings to default. This will revert the network configuration to factory settings, and you may be able to access it again.
      6. Seek professional help: If none of the above steps work, it is recommended to contact professional data recovery services. They have specialized tools and expertise to recover data from inaccessible or unrecognized NAS devices. However, note that professional data recovery can be costly.

      Remember, it's always important to have regular backups of your data to avoid data loss situations.

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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

  • How does the NAS Asustor LOCKERSTOR 4RS function as an email server, and what are its key features and capabilities in this regard?

    The NAS Asustor LOCKERSTOR 4RS can function as an email server through its built-in Mail Server application. This application allows users to create and manage their own email accounts and domains directly on the NAS.

    Key features and capabilities of the NAS Asustor LOCKERSTOR 4RS as an email server include:

    1. Domain and Account Management: Users can create multiple email domains and accounts, allowing them to manage email services for different organizations or individuals.
    2. Webmail Interface: The NAS provides a web-based interface for users to access their emails from any device with an internet connection. This interface is user-friendly and supports features like email composition, folder management, and search.
    3. POP3/IMAP Support: The Mail Server application supports both POP3 and IMAP protocols, allowing users to access their emails through various email clients or mobile devices.
    4. SMTP Relay: The NAS can act as an SMTP relay server, enabling users to send outgoing emails through the NAS using their email clients.
    5. Spam Filter and Anti-Virus: The Mail Server application includes a built-in spam filter and anti-virus feature to protect against unwanted emails and potential threats.
    6. Backup and Restore: The NAS allows users to back up and restore their email data, ensuring the safety of important emails and attachments.
    7. Encryption and Security: The Mail Server application supports SSL/TLS encryption for secure email communication. It also provides features like IP access control and account authentication to enhance security.
    8. Email Group and Alias: Users can create email groups and aliases, making it easier to manage and distribute emails among multiple recipients.

    Overall, the NAS Asustor LOCKERSTOR 4RS offers a comprehensive email server solution with essential features and capabilities for managing personal or organizational email services.

  • What are the advantages of using the NAS Asustor LOCKERSTOR 4RS as an email server compared to traditional email hosting services?

    Using the NAS Asustor LOCKERSTOR 4RS as an email server offers several advantages over traditional email hosting services:

    1. Data control: With an Asustor LOCKERSTOR 4RS, you have complete control over your email data. Unlike traditional hosting services where your data is stored on third-party servers, using a NAS allows you to keep your data on-premises, ensuring full control and ownership.
    2. Enhanced security: By hosting your email server on a NAS, you can implement your own security measures to protect sensitive information. You can set up firewalls, encryption, and other security protocols tailored to your specific needs, providing a higher level of data protection.
    3. Cost-effective: Hosting your email server on a NAS eliminates the recurring costs associated with traditional email hosting services. Once you purchase the NAS, you have a one-time investment, and you can host multiple email accounts without incurring additional charges.
    4. Scalability: The Asustor LOCKERSTOR 4RS offers scalability, allowing you to expand your email server as your needs grow. You can easily add more storage capacity or upgrade hardware components to handle increased email traffic without relying on external service providers.
    5. Customization: With a NAS, you have the flexibility to customize your email server according to your requirements. You can install additional applications, integrate with other services, and configure settings to meet your specific needs, providing a personalized email experience.
    6. Offline access: In case of internet connectivity issues or downtime, having an on-premises email server ensures that you can still access and manage your emails. This can be crucial for businesses that heavily rely on email communication.
    7. Reduced reliance on third-party providers: By hosting your own email server, you minimize dependence on external service providers. This reduces the risk of service disruptions due to provider issues or changes in terms and conditions.
    8. Increased privacy: With a self-hosted email server, you have greater control over privacy. Your emails are not stored on external servers, reducing the exposure to potential data breaches or unauthorized access.

    Overall, using the NAS Asustor LOCKERSTOR 4RS as an email server provides more control, security, customization options, and cost savings compared to traditional email hosting services.

  • Can the NAS Asustor LOCKERSTOR 4RS handle a large number of email accounts and heavy email traffic, and what are the recommended specifications for optimal performance in an email server setup?

    The NAS Asustor LOCKERSTOR 4RS is a capable device that can handle a large number of email accounts and heavy email traffic. However, the optimal performance of an email server setup depends on various factors, including the number of concurrent users, the size of email attachments, and the specific email server software being used.

    To ensure optimal performance, here are some recommended specifications for an email server setup:

    1. Processor: A powerful multi-core processor, such as an Intel Xeon or AMD Ryzen, is recommended to handle the processing demands of email traffic.
    2. Memory (RAM): Sufficient RAM is crucial for handling multiple email accounts and concurrent connections. A minimum of 8GB RAM is recommended, but higher amounts (16GB or more) may be required for heavy usage.
    3. Storage: The LOCKERSTOR 4RS offers up to 64TB of storage capacity, which should be sufficient for storing email data. Consider using RAID configurations for data redundancy and improved performance.
    4. Network Connectivity: Gigabit Ethernet ports are essential for fast and reliable network connectivity. Consider using link aggregation (LACP) to combine multiple network interfaces for increased bandwidth and redundancy.
    5. Email Server Software: Choose a robust email server software that is known for its performance and scalability. Popular options include Microsoft Exchange Server, Zimbra, and Postfix.
    6. Backup and Disaster Recovery: Implement regular backups of email data to ensure data integrity and quick recovery in case of any hardware or software failures.

    It's important to note that the performance of an email server setup can also be influenced by other factors, such as the network infrastructure, the efficiency of the email client applications used, and the overall system load on the NAS.

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