How to Recover Data from Synology Hybrid RAID

Yvette Bonnet updated Jul 09, 26

5 min(s)

TL;DR:

To successfully recover data from a Synology Hybrid RAID (SHR), immediately power down the NAS to halt all write activities, label drives by their exact bay order, and reconstruct the storage layout using sector-level clones of the member disks.
    ● Because SHR supports mixed drive sizes, total storage capacity alone cannot determine the correct layout structure, meaning recovery strictly depends on preserving the original disk sequence and storage pool metadata.
    ● Drives exhibiting physical damage, repetitive dropouts, or severe SMART warnings require immediate sector-level cloning or professional diagnosis, as attempting a degraded volume rebuild on unstable hardware will overwrite metadata and reduce recovery options.
    ● When scanning the reconstructed volume with software like Recoverit Data Recovery, you must save all extracted files to a completely separate storage device to prevent irreversibly overwriting the original SHR disks.

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Data may be recoverable from Synology Hybrid RAID when enough member disks are readable and the original storage layout has not been heavily overwritten or rebuilt incorrectly. SHR recovery should start by stopping write activity, preserving disk order, checking drive health, and working from cloned copies or a verified reconstructed volume whenever possible.

Step 1
Power down the NAS if rebuilds, sync jobs, repair actions, or file writes are still running. Continued activity can overwrite metadata and reduce recovery options.
Step 2
Remove the drives carefully and label each disk by slot order. Synology Hybrid RAID can involve RAID and volume layers, so the original disk sequence and member status matter during reconstruction.
Step 3
Check drive health with read-only methods where possible. If a drive shows serious SMART warnings, unusual noise, repeated disconnects, or slow reads, create a sector-level clone before further recovery work.
Step 4
Reconstruct the storage layout from detected metadata or known settings. Confirm disk order, RAID level, parity layout, volume structure, and file system details before scanning files.
Step 5
Scan the reconstructed volume or disk images, preview recoverable files if possible, and save recovered data to a different storage device. Do not restore files back to the same SHR disks during recovery.

Common Issues and Fixes

NAS volume does not mount: likely cause is metadata corruption, file system damage, or an incomplete rebuild; fix by stopping repair attempts and scanning cloned member disks or a reconstructed copy.
One SHR drive is missing: likely cause is disk failure, a loose connection, or a bad bay; fix by checking detection carefully and cloning the unstable disk first if it is still readable.
Recovered files have wrong names or folders: likely cause is file system damage; fix by using a deeper scan and sorting results by file type, date, or signature if the folder tree cannot be rebuilt.
Array is detected with the wrong capacity: likely cause is incorrect disk order, missing members, or wrong layout detection; fix by rechecking slot sequence and detected RAID metadata.
Recovery scan is very slow: likely cause is weak sectors, failing hardware, or a USB adapter bottleneck; fix by using stable direct connections and imaging weak drives before repeated scans.

Quick Tips

Keep these points in mind before attempting Synology Hybrid RAID recovery:

SHR can use mixed drive sizes, so total capacity alone is not enough to reconstruct the original layout correctly.
A degraded SHR volume may still contain readable data, but rebuilding on questionable disks can make recovery harder.
Encrypted shared folders or volumes may remain unreadable without the correct key, password, or recovery information.
Physical damage, liquid exposure, clicking sounds, or repeated dropouts usually require professional diagnosis before software recovery attempts.

💡Protip:

Before removing Synology drives, record the NAS model, drive bay order, pool status, volume type, and any recent rebuild or expansion history. SHR recovery often depends on the original disk sequence and storage pool metadata, not just the files visible in the NAS interface.