Recovering Data from NAS Synology Diskstation DS115j RAID Arrays: Tips for Handling Component Wear

Contents

• Why Regular Data Recovery Tools Can’t Restore Files from RAID
• Key Information About the NAS Synology Diskstation DS115j
• How to Remove Hard Disks from Your NAS and Connect Them to a PC
  • Step-by-Step Data Recovery with Hetman RAID Recovery
  • How to Safely Recover Data from Disk Images
  • Where Are the User’s Files Actually Stored?
  • RAID Recovery Software: Detailed Comparison

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.

How can data be recovered from a NAS Synology Diskstation DS115j device after a malfunction or data loss event?

Recovering data from a malfunctioning or data loss event on a Synology DiskStation DS115j NAS device can be done through several methods:

1. Check hardware connections: Ensure that all cables and connections are properly connected and functioning. Sometimes, a loose connection can cause malfunctions or data loss.
2. Restart the device: Try restarting the NAS device to see if it resolves any temporary issues. This simple step can often fix minor glitches.
3. Use Synology Assistant: Synology Assistant is a software tool provided by Synology that helps in managing and troubleshooting NAS devices. Install the Synology Assistant on a computer connected to the same network as the DS115j, and it will detect and assist in diagnosing any issues with the device.
4. Check DiskStation Manager (DSM) interface: Access the DSM interface of the DS115j by entering its IP address in a web browser. Ensure that all settings and configurations are correct. Look for any error messages or warnings that might indicate the cause of the malfunction or data loss.
5. Contact Synology Support: If the above steps do not resolve the issue, it is recommended to contact Synology Support for assistance. They have specialized knowledge and tools to diagnose and troubleshoot NAS-related problems.
6. Data recovery services: In case of severe data loss, such as disk failure or corruption, professional data recovery services might be required. These services specialize in retrieving data from damaged storage devices. It is important to note that data recovery can be expensive and not always guaranteed.

Prevention is always better than recovery, so it is advisable to regularly back up data from the NAS device to an external storage device or cloud service to minimize the impact of any potential data loss events.

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

Although the NAS Diskstation DS115j 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.

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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 Synology Diskstation DS115j. 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 Synology

Diskstation DS115j has 1 HDD slots, and it supports the following array types:

• Nie wspiera;

NAS supports:

• EXT4;
• EXT3 (External Disk Only);
• FAT (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.

   

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.

   

Where Are the User’s Files Actually Stored?

The Synology Diskstation DS115j 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