How to recover data from Promise Pegasus2 M4 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 Promise Pegasus2 M4

Promise Pegasus2 M4 NAS Data Recovery in 2024

In this step-by-step tutorial, we’ll show you how to rebuild your RAID and recover data from Pegasus2 M4.

How to recover data from NAS Promise Pegasus2 M4

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 Promise 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 storage tiering or caching strategies impact data availability and potential loss on NAS Promise Pegasus2 M4 devices?

Storage tiering and caching strategies can have a significant impact on data availability and potential loss on NAS Promise Pegasus2 M4 devices. Here are a few ways in which these strategies can affect data availability and potential loss:

  1. Improved Performance: By implementing storage tiering and caching strategies, you can improve the overall performance of your NAS device. Caching allows frequently accessed data to be stored in faster storage media, such as solid-state drives (SSDs), resulting in faster read and write speeds. This improves data availability by reducing latency and ensuring quick access to frequently accessed data.
  2. Data Redundancy: Storage tiering can also help in ensuring data redundancy. By using a combination of different storage media, such as SSDs and hard disk drives (HDDs), you can create redundant copies of critical data. In the event of a drive failure, the redundant copy can be used to maintain data availability and prevent potential loss.
  3. Data Protection: Caching strategies, such as write-back caching or write-through caching, can impact data protection. Write-back caching temporarily stores write operations in cache before writing them to the permanent storage. While this improves performance, there is a risk of potential data loss if a power outage or system failure occurs before the data is written to the permanent storage. On the other hand, write-through caching immediately writes data to the permanent storage, ensuring data durability but potentially affecting performance.
  4. Capacity Optimization: Storage tiering helps optimize storage capacity by automatically moving less frequently accessed data to slower storage tiers. This frees up space on faster storage media for frequently accessed data, improving performance. However, there is a risk of potential data loss if the tiering algorithm is not properly configured or if there is a failure in the tiering process.
  5. Backup and Recovery: Storage tiering and caching strategies should be considered in the context of backup and recovery. While these strategies can improve performance and data availability, they should not be considered a substitute for regular backups. It is essential to have a robust backup strategy in place to protect against potential data loss caused by hardware failures, software errors, or other unforeseen events.

In summary, storage tiering and caching strategies can have a positive impact on data availability and performance on NAS Promise Pegasus2 M4 devices. However, careful planning, configuration, and monitoring are necessary to mitigate the potential risks of data loss and ensure the overall reliability and resilience of the storage system.

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

Although NAS Pegasus2 M4 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 Promise Pegasus2 M4. 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 Promise

How to recover data from a Promise

Pegasus2 M4 has 4 HDD slots, and it supports the following array types:

  • RAID 0;
  • RAID 1;
  • RAID 1E;
  • RAID 3;
  • RAID 5;
  • RAID 6;
  • RAID 30;
  • 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 Promise Pegasus2 M4 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

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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 Pegasus2 M4, feel free to leave a comment!
  • Jimmy Stevenson
    Jimmy Stevenson 7.09.2023 06:43 #
    Is it possible to recover data from a NAS Promise Pegasus2 M4 device that has suffered a power loss or sudden shutdown?
    • Hetman Software
      Hetman Software 7.09.2023 06:59 #

      Yes, it is possible to recover data from a NAS (Network Attached Storage) device, such as the Promise Pegasus2 M4, that has suffered a power loss or sudden shutdown. However, the success of data recovery depends on various factors, including the extent of the damage to the device and the condition of the hard drives.

      Here are a few steps you can take to attempt data recovery:

      1. Power off the NAS device: If the device has suffered a sudden shutdown or power loss, it is important to turn it off immediately to prevent further damage.
      2. Assess the physical condition: Check if there are any visible signs of physical damage to the device or hard drives. If you notice any physical damage, it is recommended to seek professional assistance from a data recovery service.
      3. Check the power supply and cables: Ensure that the power supply and cables are properly connected and functioning. Sometimes, power loss can be due to loose connections.
      4. Power on the device: After ensuring the power supply and cables are intact, power on the NAS device and observe its behavior. If it fails to boot or shows any error messages, it might indicate a more serious issue.
      5. Seek professional help: If the NAS device fails to function properly or if you are unable to access your data, it is advisable to contact a professional data recovery service. They have specialized tools and expertise to recover data from damaged NAS devices.

      Remember, it is crucial to avoid any further attempts at DIY data recovery if you are not experienced in handling such situations, as it may lead to permanent 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 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.

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Questions and answers

  • What are the key factors to consider when selecting an additional hard drive for the NAS Promise Pegasus2 M4?

    When selecting an additional hard drive for the NAS Promise Pegasus2 M4, there are several key factors to consider:

    1. Compatibility: Ensure that the hard drive you choose is compatible with the NAS enclosure. Check the specifications and compatibility list provided by the manufacturer to ensure it will work seamlessly with the Pegasus2 M4.
    2. Capacity: Determine the capacity you require based on your storage needs. Consider the amount of data you currently have and how much additional space you may need in the future. The Pegasus2 M4 supports 3.5" SATA hard drives, so choose a capacity that suits your requirements.
    3. Speed and Performance: Consider the speed and performance of the hard drive. Look for a drive with a high RPM (Revolutions Per Minute) for faster data transfer rates. Additionally, if you require faster performance, consider selecting a solid-state drive (SSD) instead of a traditional hard disk drive (HDD).
    4. RAID Configuration: Decide on the RAID configuration you want to use with the Pegasus2 M4. The NAS enclosure supports various RAID levels, such as RAID 0, RAID 1, RAID 5, RAID 6, and RAID 10. Depending on your data protection and performance needs, choose the appropriate hard drive(s) to support the desired RAID configuration.
    5. Reliability and Durability: Look for hard drives that are known for their reliability and durability. Consider brands with a good track record for producing high-quality drives that are less prone to failure. This is crucial for ensuring the safety of your data.
    6. Power Consumption: Take into account the power consumption of the hard drive. Lower power consumption can lead to reduced energy costs and better overall efficiency of the NAS system.
    7. Price: Consider your budget when selecting an additional hard drive. Compare prices from different manufacturers and retailers to find the best balance between cost and performance.

    By considering these key factors, you can select a compatible and suitable hard drive for your NAS Promise Pegasus2 M4 that meets your storage needs and performance requirements.

  • What is the maximum storage capacity supported by the Promise Pegasus2 M4, and how does it affect the choice of an additional hard drive?

    The Promise Pegasus2 M4 is a Thunderbolt 2 storage solution. It supports a maximum storage capacity of 16TB.

    When choosing an additional hard drive, it is important to consider the maximum storage capacity supported by the Pegasus2 M4. If you exceed the maximum capacity, the additional hard drive may not be recognized or utilized fully by the system. Therefore, it is essential to ensure that the capacity of the additional hard drive does not exceed the maximum supported capacity of 16TB.

  • Are there any specific compatibility requirements or recommended hard drive models for expanding the storage capacity of the Promise Pegasus2 M4 NAS?

    The Promise Pegasus2 M4 NAS is designed to work with any standard 3.5-inch SATA hard drives. It supports both HDD (Hard Disk Drive) and SSD (Solid State Drive) models. However, there are no specific compatibility requirements or recommended hard drive models mentioned by Promise Technology for expanding the storage capacity of the Pegasus2 M4 NAS.

    As long as the hard drive is a standard 3.5-inch SATA drive, it should be compatible with the Pegasus2 M4 NAS. It is always a good practice to choose reliable and reputable hard drive brands for optimal performance and reliability.

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