RAID Controller Failure on NAS Synology DiskStation DS3615xs: Recovery Techniques and Data Recovery

Has your NAS Synology DiskStation DS3615xs 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?

RAID Controller Failure on NAS Synology DiskStation DS3615xs: Recovery Techniques and Data Recovery
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Synology DiskStation DS3615xs 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 DiskStation DS3615xs. We’ll walk through the most common causes of failure and demonstrate proven methods to restore files from a lost or degraded RAID array.

RAID Controller Failure on NAS Synology DiskStation DS3615xs: Recovery Techniques and Data Recovery

RAID Recovery™ 2.8
Recover data from damaged RAID arrays inaccessible from a computer.
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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 Synology 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.

Can data be lost during the process of upgrading or updating the NAS Synology DiskStation DS3615xs device's firmware?

Yes, there is a possibility of data loss during the process of upgrading or updating the firmware of a NAS Synology DiskStation DS3615xs device. Although rare, there can be unforeseen issues such as power interruptions, hardware failures, or software glitches that may cause data loss. It is always recommended to have a backup of important data before performing any firmware updates or upgrades to ensure the safety of your data.

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

Although the NAS DiskStation DS3615xs 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:

  1. 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.

  2. 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.

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

  4. 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.

    Go to view
    How to Order Remote Data Recovery

    How to Order Remote Data Recovery

Step-by-Step Data Recovery with Hetman RAID Recovery

Hetman Raid Recovery

This program restores data from damaged RAID arrays and is fully compatible with Synology DiskStation DS3615xs. 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.

Go to view
How to recover data from a Synology

How to recover data from a Synology

DiskStation DS3615xs has 12 HDD slots, and it supports the following array types:

  • Synology Hybrid RAID (SHR);
  • RAID 6;
  • RAID 5;
  • RAID 10;
  • RAID 1;
  • RAID 0;
  • Basic;
  • JBOD;

NAS supports:

  • Btrfs;
  • EXT4;
  • EXT3 (External Disk Only);
  • FAT32 (External Disk Only);
  • exFAT (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:

  1. Ensure you have enough free space to store the image. Its size will typically match the size of the original disk.

  2. In the main window, select the target disk and choose Tools - Save Disk. You can also select multiple disks if needed.

  3. 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.

    Hetman RAID Recovery: Image Creation Wizard

  4. 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.

    Hetman RAID Recovery: Choose a disk or save the image via FTP

Where Are the User’s Files Actually Stored?

The Synology DiskStation DS3615xs network-attached storage keeps DSM (DiskStation Manager) 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

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Comments (1)

  • 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 DiskStation DS3615xs, feel free to leave a comment!
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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 is DLNA and how does it work in the context of media streaming and sharing?

    DLNA, which stands for Digital Living Network Alliance, is a standard protocol that enables devices to share and stream media content over a local network. It allows different devices, such as smartphones, tablets, computers, smart TVs, and game consoles, to communicate and share media files seamlessly.

    DLNA works by establishing a network connection between devices using the same local network. The devices must be DLNA-certified, meaning they meet the interoperability guidelines set by the DLNA organization.

    To stream and share media content, the DLNA-enabled device acts as a server, while the receiving device acts as a client. The server device makes its media files, such as photos, videos, and music, available on the network. The client device can then discover and access these media files for streaming or playback.

    DLNA uses Universal Plug and Play (UPnP) technology to automatically detect and connect devices on the network. Once connected, the client device can browse the available media files on the server device and initiate streaming or transfer requests. DLNA supports various media formats and codecs, ensuring compatibility between different devices.

    Furthermore, DLNA allows for additional functionalities like remote control and media playback control. For example, a DLNA-enabled smartphone can act as a remote control to browse and play media files on a smart TV or speakers.

    Overall, DLNA simplifies the process of sharing and streaming media content across different devices on a local network, providing a convenient and seamless multimedia experience.

  • How does a NAS Synology DiskStation DS3615xs utilize the DLNA protocol to facilitate media management and streaming?

    The Synology DiskStation DS3615xs is a Network Attached Storage (NAS) device that utilizes the DLNA (Digital Living Network Alliance) protocol to facilitate media management and streaming. Here's how it works:

    1. Media Server: The DS3615xs acts as a media server, which means it stores and organizes media files such as photos, videos, and music. It supports various file formats and can handle large libraries of media content.
    2. DLNA Certification: The DS3615xs is DLNA-certified, which ensures compatibility with other DLNA-certified devices like smart TVs, media players, game consoles, and mobile devices. This certification guarantees seamless communication and streaming between devices.
    3. Media Indexing: The DS3615xs automatically indexes the media files stored on its hard drives. It creates a media library that includes metadata such as titles, genres, album covers, and more. This indexing process helps in categorizing and organizing the media content for easy access.
    4. Media Streaming: Once the media files are indexed, DLNA-compatible devices connected to the same network can discover and access the DS3615xs as a media source. Users can browse the media library and stream content directly to their devices without needing to transfer or copy files locally.
    5. Transcoding: The DS3615xs supports on-the-fly transcoding, which means it can convert media files into different formats and resolutions to ensure compatibility with the target device. For example, if a video file is in a format not supported by the device, the DS3615xs can transcode it into a compatible format in real-time.
    6. Remote Access: DLNA also allows remote access to media content. Users can access their DS3615xs media library from outside their home network by setting up port forwarding or using Synology's QuickConnect service. This enables streaming media on the go, even when not connected to the local network.

    Overall, the DS3615xs leverages the DLNA protocol to provide a seamless media management and streaming experience. It acts as a central media server, allowing users to access and stream their media content on various DLNA-certified devices within their home network or remotely.

  • What are the key features and benefits of using DLNA with a Synology DiskStation DS3615xs, and how does it enhance the overall media experience?

    The key features and benefits of using DLNA with a Synology DiskStation DS3615xs are as follows:

    1. Media Streaming: DLNA allows you to stream media content such as videos, photos, and music from your DiskStation to DLNA-enabled devices like smart TVs, gaming consoles, and media players. It provides a seamless and convenient way to access your media files on different devices within your home network.
    2. Easy Setup: The DiskStation DS3615xs has built-in DLNA server functionality, which means you don't need to install any additional software or configure complex settings. It is ready to use out of the box, making the setup process quick and hassle-free.
    3. Multi-room Streaming: DLNA enables multi-room streaming, allowing you to play media simultaneously on multiple DLNA-certified devices. You can enjoy the same movie or music in different rooms, creating a synchronized entertainment experience throughout your home.
    4. Cross-platform Compatibility: DLNA is a widely supported standard, ensuring compatibility with various devices and operating systems. Whether you have a Windows PC, Mac, Android smartphone, or iOS device, you can easily access and stream media from your DiskStation using DLNA.
    5. Remote Access: With DLNA and the Synology DiskStation, you can access your media files remotely over the internet. This means you can stream your favorite movies or music from your DiskStation to your DLNA-enabled device even when you are away from home. It enhances the flexibility and convenience of accessing your media library from anywhere.

    Overall, using DLNA with a Synology DiskStation DS3615xs enhances the media experience by providing a centralized and efficient way to manage, stream, and access your media files. It simplifies the process of sharing and enjoying your multimedia content across multiple devices, making it easier to enjoy your favorite movies, music, and photos throughout your home network.
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