Technical Recovery Process for Your Synology DiskStation

The “access denied” error and the fact that the drives are not recognised when connected directly to a computer are strong indicators of logical or software-based failure, often related to the Synology’s proprietary operating system (DSM), its file system, or the Synology Hybrid RAID (SHR) configuration. Our recovery process is meticulously designed to address these complexities without causing further damage to your data.

1. Stage 1: In-depth Evaluation & Secure Imaging

   • Diagnostic Analysis: Our engineers will first perform a thorough assessment of each hard drive from your DiskStation to determine their physical state. We use specialised hardware to check for electronic issues and ensure the drives are physically functional.

   • Secure Disk Imaging: Once the drives are stabilised, we create a complete, sector-by-sector image of each one. This process is read-only, meaning your original drives are not altered or written to in any way. All recovery work is performed on these image files, guaranteeing the safety of your original media .

2. Stage 2: Logical RAID Reconstruction & File System Analysis
   This is the most critical phase for Synology recoveries and is where our specialised expertise is essential.

   • Virtual RAID Reconstruction: We analyse the disk images to determine the precise parameters of your Synology’s storage volume. This involves reverse-engineering the RAID configuration, including the order of the drives, stripe size, and parity information, even for complex setups like Synology Hybrid RAID (SHR) .

   • Btrfs/EXT4 File System Repair: Synology systems typically use the Btrfs or ext4 file system. Corruption here is a common cause of “access denied” errors. Our engineers use professional tools to repair the file system’s metadata—the “table of contents” for your data—to make the volume logically accessible again .

   • Data Extraction: Once the virtual volume is successfully reconstructed, we can extract your files and folder structure from the image.

3. Stage 3: Data Verification & Return

   • We will provide you with a detailed list of all recovered data for your review.

   • After your confirmation, we return your recovered data onto a new storage device of your choice, such as a large-capacity external hard drive.

🖥️ Supported Systems & Scenarios

Our expertise extends to a comprehensive range of Synology-specific and general data loss scenarios:

• Synology Models: We have experience with the entire DiskStation series (e.g., DS220+, DS920+, DS1520+, DS1621+) and others .

• File Systems: Specialised recovery from Btrfs and ext4 file systems, which are standard in Synology devices .

• RAID Configurations: Full support for Synology Hybrid RAID (SHR), RAID 1, RAID 5, RAID 6, and other standard levels .

• Common Causes We Address: Drive failure in a multi-disk array, accidental deletion, file system corruption, failed firmware/DSM updates, and RAID volume crashes .

❌ What You Should Avoid Doing

To maximise the chances of a full recovery, we strongly advise against the following:

• Do not attempt to force the NAS to rebuild or repair itself through the Synology interface, as this can overwrite data.

• Do not run Check Disk (CHKDSK) or similar file system repair utilities on the drives, as they are not designed for Synology’s file systems and can cause irreversible damage .

• Avoid any further DIY troubleshooting with the drives, such as repeatedly powering the unit on and off.

• Do not initialise or format the drives if the Synology DSM suggests it.

💡 Why Choose Sheffield Data Recovery?

• 25 Years of UK-Based Expertise: Our long history is a testament to our proven technical expertise and our commitment to providing a trusted service to our clients.

• Specialist Synology Knowledge: We have deep, specific experience with the intricacies of Synology NAS devices, including SHR and the Btrfs file system, which generic computer repair shops lack .

• No Recovery, No Fee Policy: We provide a free evaluation and a fixed-price quote. You only pay if we are successful in recovering your data.

• Secure & Confidential Service: We understand the personal nature of your family’s data. Our entire process is designed to ensure complete privacy and security for your information.

We know how important this data is to you and your family. Please contact our technical team here in Sheffield for a confidential, free evaluation of your Synology DiskStation. We are ready to provide the expert assistance you need.