How to recover data from Thecus N8900PRO 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 Thecus N8900PRO

Thecus N8900PRO NAS Data Recovery in 2024

In this step-by-step tutorial, we’ll show you how to rebuild your RAID and recover data from N8900PRO.

How to recover data from NAS Thecus N8900PRO

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 Thecus 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 regular performance monitoring and optimization help in preventing data loss on NAS Thecus N8900PRO devices?

Regular performance monitoring and optimization can help in preventing data loss on NAS Thecus N8900PRO devices in the following ways:

  1. Early detection of issues: By regularly monitoring the performance of the NAS device, you can identify any potential issues or bottlenecks that could lead to data loss. This allows you to take proactive measures to address the problem before it escalates.
  2. Identifying resource utilization: Performance monitoring helps you understand how resources such as CPU, memory, and storage are being utilized. By analyzing these metrics, you can identify any resource constraints that could impact the availability and integrity of your data.
  3. Capacity planning: Monitoring the storage capacity of the NAS device helps you plan for future growth and prevent data loss due to insufficient storage space. By identifying trends and patterns in data usage, you can proactively allocate additional storage or optimize existing storage to avoid data loss.
  4. RAID health monitoring: Thecus N8900PRO devices support RAID configurations for data redundancy and protection. Regular performance monitoring allows you to check the health and status of the RAID arrays, ensuring that they are functioning properly and protecting your data against drive failures.
  5. Network monitoring: Monitoring the network connectivity and performance of the NAS device helps you identify any issues that could lead to data loss, such as network congestion or connectivity failures. By detecting and resolving these issues promptly, you can ensure uninterrupted access to your data.
  6. Backup monitoring: Regularly monitoring the backup processes and schedules on the NAS device helps you verify the integrity and completeness of your data backups. This ensures that you have a reliable backup in case of data loss events.
  7. Firmware and software updates: Performance monitoring can help you identify any compatibility issues or bugs in the NAS device's firmware or software. By keeping the device up to date with the latest updates and patches, you can prevent potential vulnerabilities that could lead to data loss.

Overall, regular performance monitoring and optimization of NAS Thecus N8900PRO devices can help you proactively identify and address any issues that could potentially lead to data loss, ensuring the availability and integrity of your data.

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

Although NAS N8900PRO 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 Thecus N8900PRO. 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 Thecus

How to recover data from a Thecus

N8900PRO has 8 HDD slots, and it supports the following array types:

  • RAID 0;
  • RAID 1;
  • RAID 5;
  • RAID 6;
  • RAID 50;
  • RAID 60;
  • RAID 10;
  • JBOD;

NAS supports:

  • EXT3;
  • EXT4;
  • XFS;

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 Thecus N8900PRO 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 N8900PRO, feel free to leave a comment!
  • Amadeus Hood
    Amadeus Hood 13.09.2023 11:42 #
    Are there any recommended data recovery service providers for NAS Thecus N8900PRO devices?
    • Hetman Software
      Hetman Software 13.09.2023 11:59 #

      There are several recommended data recovery service providers for NAS Thecus N8900PRO devices. Some of the top providers include:

      1. DriveSavers Data Recovery: DriveSavers is a well-known data recovery company that offers services for a wide range of devices, including NAS devices like Thecus N8900PRO. They have a high success rate and provide professional and secure data recovery services.
      2. Kroll Ontrack: Kroll Ontrack is another reputable data recovery service provider that offers services for NAS devices. They have a team of experts with extensive experience in recovering data from various storage devices, including Thecus N8900PRO.
      3. Gillware Data Recovery: Gillware Data Recovery is a trusted provider that specializes in NAS data recovery. They have advanced tools and techniques to recover data from failed NAS devices, including Thecus N8900PRO.
      4. Secure Data Recovery Services: Secure Data Recovery Services is a well-established company that offers data recovery services for various devices, including NAS devices. They have a team of certified engineers who can handle complex data recovery scenarios.

      It's recommended to contact these providers directly to discuss your specific data recovery needs and get a quote for their services.

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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 is iSCSI and how does it work?

    iSCSI (Internet Small Computer System Interface) is a storage networking protocol that allows the transmission of SCSI (Small Computer System Interface) commands over IP networks. It enables the use of IP networks, such as Ethernet, to connect storage devices and servers, providing a flexible and cost-effective alternative to traditional Fibre Channel (FC) storage area networks (SANs).

    iSCSI works by encapsulating SCSI commands and data into IP packets, which can then be sent over an IP network. It utilizes the TCP/IP protocol suite for reliable and secure data transmission. The iSCSI protocol operates at the application layer of the TCP/IP stack.

    The key components of an iSCSI setup include:

    1. Initiator: The client device or server that initiates the SCSI commands and requests data from the storage device.
    2. Target: The storage device or server that responds to the SCSI commands and provides access to the storage resources.
    3. Network: The IP network that connects the initiator and target devices, typically using Ethernet.

    When an iSCSI connection is established, the initiator sends SCSI commands to the target, such as read or write requests. The target processes these commands and performs the necessary operations on the storage resources, such as retrieving or storing data. The target then sends the response back to the initiator over the IP network.

    To ensure data integrity and reliability, iSCSI uses various techniques such as checksums, sequencing, and acknowledgments. It also supports features like authentication, encryption, and access control to enhance security.

    Overall, iSCSI provides a way to extend the benefits of SCSI storage over IP networks, enabling remote storage access, centralized storage management, and improved scalability and flexibility in storage infrastructure.

  • Can you explain the benefits of using iSCSI in a network storage environment?

    Certainly! iSCSI (Internet Small Computer System Interface) is a protocol used to transmit SCSI commands over IP networks, allowing for the creation of a storage area network (SAN) using existing Ethernet infrastructure. Here are some benefits of using iSCSI in a network storage environment:

    1. Cost-effective: iSCSI utilizes standard Ethernet infrastructure, eliminating the need for specialized Fibre Channel (FC) equipment. This makes it a more cost-effective solution for small to medium-sized businesses.
    2. Flexibility: iSCSI can be implemented over long distances, allowing for storage consolidation across multiple locations. It provides flexibility in terms of scalability, as storage capacity can be easily expanded without significant infrastructure changes.
    3. Compatibility: iSCSI is compatible with existing IP networks, making it easier to integrate with other network services and applications. It can run on various operating systems and can be accessed from different platforms, ensuring interoperability.
    4. Performance: iSCSI offers good performance for most applications, especially with the advancements in Ethernet technology. With the use of technologies like jumbo frames and network interface card (NIC) teaming, iSCSI performance can be further enhanced.
    5. Centralized management: iSCSI allows for centralized management of storage resources. Storage administrators can easily provision, allocate, and manage storage resources from a single interface, simplifying the management process.
    6. Data protection: iSCSI supports various data protection mechanisms like snapshots, replication, and encryption. These features ensure data integrity, availability, and security, protecting against data loss and unauthorized access.
    7. Backup and disaster recovery: iSCSI facilitates efficient backup and disaster recovery processes. It enables the use of disk-based backup solutions, simplifies backup administration, and allows for quick recovery in case of system failures or disasters.

    Overall, iSCSI provides a cost-effective, flexible, and scalable solution for network storage environments, enabling organizations to efficiently manage and utilize their storage resources.

  • Does the NAS Thecus N8900PRO support the iSCSI protocol, and if so, what are the specific features and capabilities it offers for iSCSI storage?

    Yes, the NAS Thecus N8900PRO does support the iSCSI protocol. It offers several features and capabilities for iSCSI storage, including:

    1. iSCSI Thin Provisioning: This feature allows you to allocate storage space on-demand, which helps optimize storage utilization and reduces wasted space.
    2. MPIO (Multipath Input/Output): The N8900PRO supports MPIO, which enables multiple paths between the NAS and the iSCSI initiators for enhanced performance and fault tolerance.
    3. LUN Masking and Mapping: You can control access to specific LUNs (Logical Unit Numbers) by masking them to selected initiators or mapping them to specific targets.
    4. CHAP Authentication: The NAS supports CHAP (Challenge-Handshake Authentication Protocol) authentication for secure access to iSCSI targets.
    5. Thin-Provisioned Cloning: This feature allows you to create clones of existing iSCSI LUNs without consuming additional physical storage space until data is actually written.
    6. Snapshot Support: The N8900PRO supports iSCSI snapshots, which provide point-in-time copies of LUNs, allowing for data protection and quick recovery.
    7. Performance Optimization: The NAS offers multiple optimization features, such as jumbo frame support, flow control, and MPIO, to enhance iSCSI performance and reduce latency.
    8. iSCSI Boot: The N8900PRO supports iSCSI boot, allowing you to boot your operating system directly from an iSCSI target, eliminating the need for local storage.

    These features and capabilities make the Thecus N8900PRO a reliable and versatile option for iSCSI storage solutions.

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