ASUSTOR NAS Data Recovery
ASUSTOR Lockerstor and Drivestor NAS data recovery for ADM firmware crashes, Deadbolt ransomware, degraded RAID arrays, and failed storage pools. ASUSTOR uses Linux mdadm software RAID with Btrfs or EXT4 filesystems. We image every member through a write-blocker and reconstruct offline. Free evaluation. No data = no charge.
Updated March 2026
8 min read
Lockerstor and Drivestor Series
ASUSTOR organizes its NAS lineup into performance tiers. The Lockerstor line targets prosumers and small businesses with Intel processors and 2.5GbE or 10GbE networking. The Drivestor line targets home users and budget deployments with Realtek or Intel Celeron processors.Lockerstor Series
- Models: AS6604T (4-bay), AS6704T (4-bay Gen 2), AS5304T (4-bay).
- RAID: RAID 0, 1, 5, 6, 10, JBOD. Factory default varies by model.
- Filesystem: Btrfs or EXT4 (user-selected during volume creation on ADM 4.0+).
Drivestor Series
- Models: AS1104T (4-bay budget), AS3304T (4-bay mid-range).
- RAID: RAID 0, 1, 5, 6, 10, JBOD. Same mdadm layer as Lockerstor.
- Filesystem: EXT4 on AS11xx models. Btrfs available on AS33xx with ADM 4.0+.
Common ASUSTOR NAS Failure Modes
ASUSTOR NAS failures center around ADM firmware corruption, ransomware attacks, and standard RAID degradation from drive failures. The underlying mdadm + Btrfs/EXT4 architecture is recoverable in most scenarios if the drives have not been reinitialized.- ADM Firmware Crash: A failed ADM update can leave the NAS unable to boot or stuck in an initialization loop. ADM runs on the system partition, separate from data volumes. Your data is intact on the member drives.
- Deadbolt Ransomware (February 2022): Deadbolt targeted ASUSTOR NAS devices through known ADM vulnerabilities, encrypting user files with AES and demanding Bitcoin payment. Files receive a .deadbolt extension. Recovery depends on whether a decryption key was obtained or whether pre-attack snapshots exist on the Btrfs volume.
- Storage Pool Degraded: One or more member drives have dropped out. ADM will prompt you to rebuild. If remaining members have weak sectors, a rebuild can push them past failure. Power down instead of rebuilding.
- Volume Inaccessible After Power Loss: Sudden power loss during a write operation can leave the Btrfs or EXT4 journal in an inconsistent state. ADM may report the volume as inaccessible or suggest formatting. Do not format.
Do not reinitialize. ADM prompts to create a new storage pool or format drives will overwrite the RAID superblocks and filesystem metadata needed for recovery. Power down, label drives, and contact us.
How We Recover Data from an ASUSTOR NAS
ASUSTOR uses Linux mdadm for RAID management with the same superblock format found in Synology and QNAP devices. Recovery follows our standard image-first workflow.- Free evaluation: Document the ASUSTOR model, ADM version, RAID level, filesystem type, and failure symptoms. For Deadbolt cases, we assess encryption state and check for surviving snapshots.
- Write-blocked imaging: Each member drive is imaged through a hardware write-blocker using PC-3000 or DeepSpar. Mechanically failed drives receive head swaps in our clean bench before imaging.
- RAID reconstruction: mdadm superblocks from the member images provide stripe size, parity rotation, and member order. PC-3000 RAID Edition assembles the virtual array from clones.
- Filesystem extraction: Btrfs subvolumes and snapshots or EXT4 journal replay and inode reconstruction. Files are extracted, verified, and copied to target media.
- Delivery: Recovered data shipped on your target drive. Working copies purged on request.
ASUSTOR NAS Recovery Pricing
Two-tiered pricing: per-member imaging fee plus $400 to $800 array reconstruction. If we recover nothing, you owe $0.Member Imaging
Logical/firmware per drive
$250–$900
Array Reconstruction
mdadm + Btrfs/EXT4 extraction
$400–$800
Mechanical Member
Clean-bench head swap per drive
$1,200–$1,500
No Data = No Charge. If we cannot recover usable data from your ASUSTOR NAS, you owe nothing.
ASUSTOR NAS Recovery FAQ
Can you recover data after an ASUSTOR ADM firmware crash?
Yes. ADM (ASUSTOR Data Master) runs on the NAS's internal storage, separate from your data volumes. A firmware crash or failed update prevents the web interface from loading, but the data on your member drives remains intact. We remove the drives, image each one through a write-blocker, and reconstruct the mdadm array and Btrfs or EXT4 filesystem offline.
Can you recover data after Deadbolt ransomware on an ASUSTOR NAS?
It depends on the state of the files. Deadbolt (February 2022) targeted ASUSTOR NAS devices through vulnerabilities in ADM, encrypting files with AES and appending a .deadbolt extension. If you paid the ransom and received a valid decryption key, we can assist with decryption and data extraction. If no key exists and the files are fully encrypted, the data cannot be decrypted by anyone. In some cases, partially encrypted volumes or snapshots taken before the attack may contain recoverable data.
Does my ASUSTOR NAS use Btrfs or EXT4?
ASUSTOR added Btrfs support in ADM 4.0. If you created your storage volume on ADM 4.0 or later and selected Btrfs during setup, your volume uses Btrfs. Volumes created on ADM 3.x or earlier, or volumes where EXT4 was selected during ADM 4.0 setup, use EXT4. The Lockerstor (AS66xx, AS67xx) and newer Drivestor (AS33xx) models support both. Older Drivestor (AS11xx) models may be limited to EXT4.
Can I move ASUSTOR drives to another NAS after a failure?
Moving drives to another ASUSTOR unit running the same ADM version can sometimes work, but it carries risk. ADM may prompt to reinitialize the drives if it does not recognize the volume configuration, and accepting that prompt destroys the existing RAID metadata. Moving drives to a non-ASUSTOR NAS will not work because ADM-specific partition layouts differ from other vendors. The safest approach is to send the drives for professional offline reconstruction.
ASUSTOR NAS down? Start a free evaluation.
Ship your drives or walk in at our Austin lab. No data = no charge.