What are the different file access levels available on the QNAP SS-839 Pro NAS (Network Attached Storage) device?

The QNAP SS-839 Pro NAS device offers several file access levels, including:Administrator: This is the highest level of access, allowing full control over all features and settings of the NAS device.User: Users can be created with specific access rights to folders and files on the NAS. This level of access allows users to manage their own files and folders, but not modify system settings.Guest: This is a limited access level that allows users to access specific folders and files on the NAS without requiring a username or password.Public: This level of access allows anyone on the network to access specific folders and files on the NAS without requiring a username or password.Group: Users can be assigned to specific groups with predefined access rights to folders and files on the NAS. This level of access allows for easy management of multiple users with similar access requirements.Shared folder access: Specific access rights can be set for individual shared folders on the NAS, allowing fine-grained control over who can read, write, or modify files within those folders.These access levels can be configured through the QNAP NAS management interface, providing flexibility and security for different users and use cases.

How can one configure and manage file access levels on the QNAP SS-839 Pro NAS?

To configure and manage file access levels on the QNAP SS-839 Pro NAS, follow these steps:Log in to the QTS (QNAP Turbo NAS System) web interface by entering the NAS IP address in a web browser.Enter your login credentials to access the QTS web interface.Once logged in, click on 'Control Panel' in the main menu.In the Control Panel, click on 'Privilege Settings' or 'Shared Folders' (depending on the QTS version).In the Privilege Settings or Shared Folders section, you can create new shared folders or manage existing ones.To create a new shared folder, click on 'Create' or 'Add' (depending on the QTS version).Provide a name for the shared folder and select the desired access rights for different user groups or individual users.You can set read-only access, read/write access, or deny access for each user or group.If needed, you can also set advanced settings like quota limits, enabling or disabling file compression, and enabling or disabling encryption for the shared folder.After configuring the access levels, click on 'Apply' or 'OK' to save the changes.If you want to manage existing shared folders, click on the folder name or select it and click on 'Edit' or 'Settings' (depending on the QTS version).In the folder settings, you can modify the access rights and advanced settings for the selected shared folder.To remove a shared folder, select it and click on 'Remove' or 'Delete' (depending on the QTS version).Confirm the deletion when prompted.By following these steps, you can configure and manage file access levels on the QNAP SS-839 Pro NAS according to your requirements.

What are the security implications and considerations when setting file access levels on the QNAP SS-839 Pro NAS?

When setting file access levels on the QNAP SS-839 Pro NAS, there are several security implications and considerations to keep in mind:User Authentication: Ensure that strong and unique passwords are set for all user accounts accessing the NAS. Use a combination of uppercase and lowercase letters, numbers, and special characters. Regularly review and update user accounts to remove any unnecessary or unused accounts.Role-Based Access Control (RBAC): Implement RBAC to assign different levels of access to different user roles. This ensures that users only have access to the files and folders necessary for their job responsibilities. Restrict administrative access to a limited number of trusted individuals.File-Level Permissions: Set appropriate file-level permissions for each user or user group. Use the principle of least privilege, granting only the necessary permissions to perform required tasks. Regularly review and update these permissions to ensure they align with the changing needs of the organization.Encryption: Enable encryption for data stored on the NAS to protect it from unauthorized access in case of physical theft or unauthorized access to the device. QNAP NAS supports various encryption options, such as AES-256, to secure data at rest.Network Security: Ensure the NAS is connected to a secure network, protected by firewalls, intrusion detection systems, and regular security updates. Implement secure protocols like SSL/TLS for remote access to the NAS, and disable insecure protocols like FTP.Regular Firmware Updates: Keep the NAS firmware up to date to patch any security vulnerabilities. Enable automatic updates or regularly check for new firmware versions on the QNAP website.Backup and Disaster Recovery: Implement a robust backup strategy to ensure data availability and protection against data loss or ransomware attacks. Regularly backup data to an offsite location or cloud storage, and test the restore process periodically.Physical Security: Protect the physical access to the NAS device by placing it in a secure location, such as a locked server room or cabinet. Restrict access to authorized personnel only.Audit Logs and Monitoring: Enable and review audit logs to detect any suspicious activities or unauthorized access attempts. Implement monitoring tools to alert administrators of any unusual or potentially malicious activities.User Education: Educate users about best practices for data security, such as avoiding sharing login credentials, being cautious of phishing attempts, and regularly updating passwords.By considering these security implications and implementing appropriate measures, the file access levels on the QNAP SS-839 Pro NAS can be set in a way that ensures data confidentiality, integrity, and availability.

Features of NAS QNAP SS-839 Pro Data Recovery for Home Enthusiasts

Name: How to recover data from a QNAP
Uploaded: 2025-10-16T08:53:56+03:00
Description: How to recover data from a QNAP

Has your NAS QNAP SS-839 Pro suddenly lost its network drive and you’re unsure what to do next? Did the RAID array collapse, making your files inaccessible? Is the device throwing errors during startup? Perhaps you accidentally rebuilt the RAID array or several hard drives failed at the same time?

Features of NAS QNAP SS-839 Pro Data Recovery for Home Enthusiasts

Data Recovery Tool

QNAP SS-839 Pro NAS Data Recovery in 2025

In this step-by-step tutorial, we’ll show you how to rebuild your RAID and recover data from an SS-839 Pro. We’ll walk through the most common causes of failure and demonstrate proven methods to restore files from a lost or degraded RAID array.

Contents

Why Regular Data Recovery Tools Can’t Restore Files from RAID
Key Information About the NAS QNAP SS-839 Pro
How to Remove Hard Disks from Your NAS and Connect Them to a PC

RAID Recovery™ 2.8

Recover data from damaged RAID arrays inaccessible from a computer.

Download

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.

What data recovery services or software options are available for NAS QNAP SS-839 Pro devices?

There are several data recovery services and software options available for NAS QNAP SS-839 Pro devices. Some of the popular ones include:

QNAP Data Recovery Service: QNAP offers a professional data recovery service specifically designed for their NAS devices. They have a team of experts who can help recover data from failed or damaged QNAP NAS systems.
Stellar Data Recovery: Stellar is a well-known data recovery software company that offers a range of solutions for NAS devices, including QNAP. Their software can help recover data from various file systems and storage devices, including QNAP NAS.
EaseUS Data Recovery Wizard: EaseUS provides a data recovery software that supports QNAP NAS devices. It can recover deleted, formatted, or lost files from the NAS system.
R-Studio: R-Studio is a comprehensive data recovery software that supports QNAP NAS devices. It can recover data from various file systems and can handle complex data loss scenarios.
Ontrack Data Recovery: Ontrack is a professional data recovery service provider that offers services for QNAP NAS devices. They have a team of experts who can recover data from failed or damaged NAS systems.

It's important to note that data recovery success depends on various factors, such as the severity of the data loss, the condition of the NAS device, and the actions taken after data loss. It is recommended to consult with professionals or use reliable software to ensure the best possible chance of successful data recovery.

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

Although the NAS SS-839 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:

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.
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.
Label each hard disk according to its position inside the NAS. The order of the drives is crucial for correct RAID reconstruction.
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 SS-839 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 QNAP

SS-839 Pro has 8 HDD slots, and it supports the following array types:

RAID 50;
RAID 60;
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);

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:

Ensure you have enough free space to store the image. Its size will typically match the size of the original disk.
In the main window, select the target disk and choose Tools - Save Disk. You can also select multiple disks if needed.
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.
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 SS-839 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.

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

Feedback

We will be happy to answer your questions!

Comments (3)

Hetman Software: Data Recovery 9.08.2022 12:31 #

If you want to ask a question about data recovery, from NAS SS-839 Pro, feel free to leave a comment!

Reply
Elias Brown 17.09.2023 02:39 #

Can data recovery from a NAS QNAP SS-839 Pro device be done if the device is showing signs of disk or storage media errors?

Reply
- Hetman Software 17.09.2023 02:59 #
  
  Yes, data recovery from a NAS QNAP SS-839 Pro device can be done even if the device is showing signs of disk or storage media errors. However, it is important to note that the success of data recovery depends on the severity and nature of the errors.
  If the device is still accessible and only a few files or folders are affected, you may be able to recover the data by using built-in recovery tools provided by QNAP or by connecting the drives to a computer and using data recovery software.
  However, if the device is completely inaccessible or if the errors are more severe, it is recommended to seek professional data recovery services. These experts have specialized tools and techniques to recover data from faulty NAS devices and can handle complex situations such as disk failures, RAID array issues, or firmware corruption.
  It is important to act quickly and avoid any further attempts to fix the issue yourself, as improper actions can potentially worsen the situation and make data recovery more difficult or even impossible.
  
  Reply

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Updated:
16.10.2025 8:53

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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.

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 xaker.ru, 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 different file access levels available on the QNAP SS-839 Pro NAS (Network Attached Storage) device?
The QNAP SS-839 Pro NAS device offers several file access levels, including:
1. Administrator: This is the highest level of access, allowing full control over all features and settings of the NAS device.
2. User: Users can be created with specific access rights to folders and files on the NAS. This level of access allows users to manage their own files and folders, but not modify system settings.
3. Guest: This is a limited access level that allows users to access specific folders and files on the NAS without requiring a username or password.
4. Public: This level of access allows anyone on the network to access specific folders and files on the NAS without requiring a username or password.
5. Group: Users can be assigned to specific groups with predefined access rights to folders and files on the NAS. This level of access allows for easy management of multiple users with similar access requirements.
6. Shared folder access: Specific access rights can be set for individual shared folders on the NAS, allowing fine-grained control over who can read, write, or modify files within those folders.
These access levels can be configured through the QNAP NAS management interface, providing flexibility and security for different users and use cases.
How can one configure and manage file access levels on the QNAP SS-839 Pro NAS?
To configure and manage file access levels on the QNAP SS-839 Pro NAS, follow these steps:
1. Log in to the QTS (QNAP Turbo NAS System) web interface by entering the NAS IP address in a web browser.
2. Enter your login credentials to access the QTS web interface.
3. Once logged in, click on "Control Panel" in the main menu.
4. In the Control Panel, click on "Privilege Settings" or "Shared Folders" (depending on the QTS version).
5. In the Privilege Settings or Shared Folders section, you can create new shared folders or manage existing ones.
6. To create a new shared folder, click on "Create" or "Add" (depending on the QTS version).
7. Provide a name for the shared folder and select the desired access rights for different user groups or individual users.
8. You can set read-only access, read/write access, or deny access for each user or group.
9. If needed, you can also set advanced settings like quota limits, enabling or disabling file compression, and enabling or disabling encryption for the shared folder.
10. After configuring the access levels, click on "Apply" or "OK" to save the changes.
11. If you want to manage existing shared folders, click on the folder name or select it and click on "Edit" or "Settings" (depending on the QTS version).
12. In the folder settings, you can modify the access rights and advanced settings for the selected shared folder.
13. To remove a shared folder, select it and click on "Remove" or "Delete" (depending on the QTS version).
14. Confirm the deletion when prompted.
By following these steps, you can configure and manage file access levels on the QNAP SS-839 Pro NAS according to your requirements.
What are the security implications and considerations when setting file access levels on the QNAP SS-839 Pro NAS?
When setting file access levels on the QNAP SS-839 Pro NAS, there are several security implications and considerations to keep in mind:
1. User Authentication: Ensure that strong and unique passwords are set for all user accounts accessing the NAS. Use a combination of uppercase and lowercase letters, numbers, and special characters. Regularly review and update user accounts to remove any unnecessary or unused accounts.
2. Role-Based Access Control (RBAC): Implement RBAC to assign different levels of access to different user roles. This ensures that users only have access to the files and folders necessary for their job responsibilities. Restrict administrative access to a limited number of trusted individuals.
3. File-Level Permissions: Set appropriate file-level permissions for each user or user group. Use the principle of least privilege, granting only the necessary permissions to perform required tasks. Regularly review and update these permissions to ensure they align with the changing needs of the organization.
4. Encryption: Enable encryption for data stored on the NAS to protect it from unauthorized access in case of physical theft or unauthorized access to the device. QNAP NAS supports various encryption options, such as AES-256, to secure data at rest.
5. Network Security: Ensure the NAS is connected to a secure network, protected by firewalls, intrusion detection systems, and regular security updates. Implement secure protocols like SSL/TLS for remote access to the NAS, and disable insecure protocols like FTP.
6. Regular Firmware Updates: Keep the NAS firmware up to date to patch any security vulnerabilities. Enable automatic updates or regularly check for new firmware versions on the QNAP website.
7. Backup and Disaster Recovery: Implement a robust backup strategy to ensure data availability and protection against data loss or ransomware attacks. Regularly backup data to an offsite location or cloud storage, and test the restore process periodically.
8. Physical Security: Protect the physical access to the NAS device by placing it in a secure location, such as a locked server room or cabinet. Restrict access to authorized personnel only.
9. Audit Logs and Monitoring: Enable and review audit logs to detect any suspicious activities or unauthorized access attempts. Implement monitoring tools to alert administrators of any unusual or potentially malicious activities.
10. User Education: Educate users about best practices for data security, such as avoiding sharing login credentials, being cautious of phishing attempts, and regularly updating passwords.
By considering these security implications and implementing appropriate measures, the file access levels on the QNAP SS-839 Pro NAS can be set in a way that ensures data confidentiality, integrity, and availability.