How to recover data from Lenovo ThinkSystem SR645 Rack Server 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?

Tips for Recovering Deleted Files from NAS Lenovo ThinkSystem SR645 Rack Server

Lenovo ThinkSystem SR645 Rack Server NAS Data Recovery in 2024

In this step-by-step tutorial, we’ll show you how to rebuild your RAID and recover data from ThinkSystem SR645 Rack Server.

Tips for Recovering Deleted Files from NAS Lenovo ThinkSystem SR645 Rack Server

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

Can remote access to NAS Lenovo ThinkSystem SR645 Rack Server devices pose additional data loss risks?

Remote access to NAS Lenovo ThinkSystem SR645 Rack Server devices can pose additional data loss risks if proper security measures are not in place. Here are some potential risks:

  1. Unauthorized access: If remote access is not properly secured with strong passwords, multi-factor authentication, and encryption, there is a risk of unauthorized individuals gaining access to the NAS device. This can lead to data loss or theft.
  2. Malware and hacking: Remote access can provide an entry point for malware or hacking attempts. Attackers can exploit vulnerabilities in the remote access software or use brute force attacks to gain control of the NAS device. Once compromised, data can be deleted, encrypted, or stolen.
  3. Human error: Remote access increases the chances of human error, such as accidental deletion or misconfiguration of settings. If data is not properly backed up or protected, these errors can lead to permanent data loss.
  4. Network vulnerabilities: Remote access relies on network connections, which can introduce vulnerabilities. If the network is not properly secured, attackers can intercept or manipulate data during transmission, leading to data loss or corruption.

To mitigate these risks, it is important to implement strong security practices:

  1. Use strong passwords and enable multi-factor authentication for remote access.
  2. Keep the NAS device and remote access software up to date with the latest security patches.
  3. Implement encryption for remote access connections to protect data in transit.
  4. Restrict remote access to trusted IP addresses or use VPNs to create secure connections.
  5. Regularly back up data to an off-site location to minimize the impact of data loss.
  6. Train employees on best practices for remote access and data security to minimize human errors.

By implementing these security measures, the risks associated with remote access to NAS Lenovo ThinkSystem SR645 Rack Server devices can be significantly reduced.

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

Although NAS ThinkSystem SR645 Rack Server 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 Lenovo ThinkSystem SR645 Rack Server. 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 Lenovo

How to recover data from a Lenovo

ThinkSystem SR645 Rack Server has 12 HDD slots, and it supports the following array types:

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

NAS supports:

  • exFAT, VFAT, FAT 12 / 16 / 32;
  • NTFS / ReFS;
  • APFS / HFS+;
  • Ext2 / 3 / 4 / ReiserFS / XFS / UFS / ZFS / Btrfs;
  • VMFS / HikvisionFS;

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 Lenovo ThinkSystem SR645 Rack Server network-attached storage keeps LifeLine 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 ThinkSystem SR645 Rack Server, feel free to leave a comment!
  • Merle Cleese
    Merle Cleese 22.08.2023 08:46 #
    Can data recovery from a NAS Lenovo ThinkSystem SR645 Rack Server device be done if the disks have been reformatted?
    • Hetman Software
      Hetman Software 22.08.2023 10:00 #

      Data recovery from a NAS Lenovo ThinkSystem SR645 Rack Server device can be challenging if the disks have been reformatted. Reformatting erases the file system and directory structure, making it difficult to recover data using conventional methods. However, it may still be possible to recover the data using specialized data recovery software or by seeking professional data recovery services.

      The success of data recovery depends on various factors such as the extent of the reformatting, the type of file system used, and the actions taken after reformatting. If the disks have been completely overwritten with new data, the chances of recovering the original data become significantly lower.

      It is recommended to immediately stop using the NAS device and seek professional assistance from a data recovery specialist who has experience in dealing with NAS systems. They can assess the situation, determine the feasibility of data recovery, and provide appropriate solutions.

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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 technologies that the Lenovo ThinkSystem SR645 Rack Server offers to ensure file access security?

    The Lenovo ThinkSystem SR645 Rack Server offers several key features and technologies to ensure file access security. These include:

    1. Trusted Platform Module (TPM): The server comes with an integrated TPM, which provides hardware-based cryptographic functions to secure sensitive data and ensure the integrity of the system.
    2. Secure Boot: The server supports Secure Boot, which ensures that only authorized and digitally signed firmware and operating system software can be executed during the boot process, protecting against unauthorized modifications.
    3. RAID Support: The server supports various RAID configurations, including hardware RAID controllers, which provide data redundancy and protection against disk failures.
    4. User Access Control: The server offers user access control mechanisms, allowing administrators to define user roles and permissions, ensuring that only authorized users have access to specific files and resources.
    5. Data Encryption: The server supports data encryption technologies such as self-encrypting drives (SEDs) and software-based encryption, which can be used to encrypt data at rest and during transmission, providing an additional layer of security.
    6. Network Security: The server includes features like firewall protection, intrusion detection and prevention systems, and virtual private network (VPN) support, which help secure network connections and prevent unauthorized access.
    7. Secure Remote Management: The server supports secure remote management protocols like IPMI (Intelligent Platform Management Interface) over HTTPS, ensuring secure remote access for server administration and monitoring.
    8. Firmware and Software Updates: Lenovo regularly releases firmware and software updates for the ThinkSystem SR645 Rack Server, which include security patches and bug fixes to address any vulnerabilities or weaknesses.

    Overall, these features and technologies help ensure file access security by providing encryption, user access control, secure boot, network security, and secure remote management capabilities.

  • How does the Lenovo ThinkSystem SR645 Rack Server implement authentication and authorization mechanisms to protect file access?

    The Lenovo ThinkSystem SR645 Rack Server implements authentication and authorization mechanisms through various features and technologies to protect file access. Some of these mechanisms include:

    1. User Authentication: The server supports user authentication through various methods such as local user accounts, Active Directory integration, LDAP, and RADIUS. These authentication mechanisms ensure that only authorized users can access the server and its files.
    2. Role-Based Access Control (RBAC): The server supports RBAC, which allows administrators to define roles and assign specific permissions to each role. This ensures that users can only access files and perform actions that are authorized for their assigned role.
    3. Access Control Lists (ACLs): ACLs are used to control file access at a granular level. Administrators can define specific permissions for individual users or groups, allowing or denying access to specific files or directories.
    4. Encryption: The server supports data encryption at rest and in transit. This ensures that files stored on the server's storage devices are protected from unauthorized access. Encryption protocols such as SSL/TLS can be used to secure data transmission over the network.
    5. Secure File Transfer Protocols: The server supports secure file transfer protocols such as SFTP (SSH File Transfer Protocol) and FTPS (FTP over SSL/TLS), which provide encrypted and authenticated file transfer capabilities.
    6. Audit Logging: The server can generate audit logs that record user access and file operations. These logs can be used for monitoring and investigating any unauthorized access attempts or suspicious activities.
    7. Firewall and Network Security: The server can be configured with firewalls and other network security measures to protect against unauthorized access from external sources.

    Overall, these authentication and authorization mechanisms implemented in the Lenovo ThinkSystem SR645 Rack Server help ensure that file access is protected and restricted to authorized users, reducing the risk of unauthorized data access or leakage.

  • Can you explain the role of encryption in the Lenovo ThinkSystem SR645 Rack Server's file access security and how it helps safeguard sensitive data?

    Encryption plays a crucial role in the file access security of the Lenovo ThinkSystem SR645 Rack Server by safeguarding sensitive data. The server utilizes encryption algorithms to convert the data into an unreadable format, known as ciphertext, which can only be decrypted with the appropriate encryption key.

    The ThinkSystem SR645 Rack Server offers various encryption capabilities that contribute to data protection. These include:

    1. Data-at-Rest Encryption: The server supports self-encrypting drives (SEDs) that encrypt data stored on the hard drives or solid-state drives (SSDs) within the server. SEDs automatically encrypt data as it is written to the drives and decrypt it when it is read, providing constant protection against unauthorized access to stored data.
    2. Data-in-Transit Encryption: The server supports secure network protocols, such as Secure Sockets Layer (SSL) and Transport Layer Security (TLS), to encrypt data as it travels over the network. This prevents potential eavesdropping or interception of data during transmission.
    3. Secure Remote Management: The server includes secure management interfaces, such as Integrated Management Module (IMM) or Baseboard Management Controller (BMC), which can be accessed remotely. These interfaces utilize encryption to ensure that sensitive management data, such as login credentials and configuration settings, are protected during remote access.

    By employing encryption, the ThinkSystem SR645 Rack Server helps safeguard sensitive data in multiple ways:

    1. Confidentiality: Encryption ensures that only authorized individuals with the encryption key can access and decipher the encrypted data. This protects against unauthorized access or data breaches, even if physical storage devices are stolen or compromised.
    2. Integrity: Encryption algorithms often include integrity checks, such as message authentication codes (MACs), to verify the integrity of the data. This ensures that the data remains unaltered during transit or storage, as any modifications to the encrypted data would result in an invalid decryption.
    3. Compliance: Encryption is often a requirement for compliance with various industry and government regulations, such as the General Data Protection Regulation (GDPR) or the Health Insurance Portability and Accountability Act (HIPAA). The server's encryption capabilities assist organizations in meeting these regulatory requirements by securing sensitive data.

    Overall, encryption in the Lenovo ThinkSystem SR645 Rack Server plays a vital role in protecting sensitive data by ensuring confidentiality, integrity, and compliance. It helps mitigate the risks associated with unauthorized access, data breaches, and tampering, thereby enhancing file access security.

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