NAS Data Recovery for Synology and QNAP Systems

What Is NAS Data Recovery and When Is It Needed?

NAS data recovery is the process of extracting files from a failed or degraded network-attached storage device by imaging each member drive independently and reconstructing the RAID array, filesystem metadata, and shared folder structures offline, without writing to the original drives.

• NAS devices from Synology, QNAP, Buffalo, and other vendors use Linux-based RAID implementations (mdadm, Btrfs RAID, ZFS) combined with proprietary management layers. When the storage pool degrades or the volume crashes, the vendor's web interface often offers only destructive options: reinitialize, recreate, or force-repair.
• Common triggers include a second member drive failing during a rebuild, firmware updates that corrupt RAID metadata, accidental LUN or volume deletion, and power surges that damage multiple members simultaneously.
• Recovery requires write-blocked imaging of each member through PC-3000 or DeepSpar hardware, RAID parameter detection (stripe size, parity rotation, member order), and virtual reassembly from cloned images.

TSI P-Trak 8525 monitoring localized ISO 14644-1 Class 4 equivalent conditions during NAS member drive imaging.

What Symptoms Indicate a NAS Needs Professional Recovery?

NAS failure symptoms range from "Volume Crashed" and "Storage Pool Degraded" warnings to inaccessible shared folders and stuck rebuilds. The correct response to every symptom is the same: stop all write activity, power down the NAS, and avoid forced rebuilds or reinitialization.

• Volume crashed / Storage pool degraded: Do not force a rebuild on failing members; this destroys parity and metadata. Power down and stop writes.
• Cannot access shared folders: Do not accept prompts to repair or recreate. Initialization overwrites critical RAID metadata.
• Multiple disk errors in logs: Avoid swapping drive order or hot-plugging repeatedly. Label drives and preserve original slot assignments.
• Drives showing as offline: Do not keep power-cycling; weak heads risk surface damage with each spin-up.
• RAID rebuilding stuck: Power down immediately to limit write-back. We can often salvage data from remaining members.
• Encrypted volumes inaccessible: Have encryption keys and passwords available. We keep data offline and under chain-of-custody.

If your NAS uses ZFS and zpool import is failing with I/O errors, see our ZFS pool import I/O error recovery guide. For Synology-specific "Volume Crashed" diagnostics, see the Synology volume crash recovery guide.

If a rebuild was already attempted on weakening members, read about how forced NAS RAID rebuilds cause permanent data loss. For NAS units reporting a degraded storage pool, we image each member through write-blocked hardware before any reconstruction.

SSH-Based Recovery Software and Degraded NAS Drives

Consumer recovery software marketed for NAS devices often instructs users to enable SSH on the NAS control panel and run scan utilities over the network. This approach works for simple file deletions on a healthy array where every member reads without errors.

On a NAS with degraded heads, firmware faults, or accumulating bad sectors, the outcome is different: the software issues intensive sequential reads across every sector of every member drive with no ability to control read timing, retry thresholds, or head positioning.

Hardware imaging tools like PC-3000 and DeepSpar manage read attempts at the command level. They skip unstable zones, build head stability maps, and limit retries to prevent head crashes on weak surfaces. SSH-based software has none of these controls.

A physically degraded drive subjected to hours of aggressive reads over the network will often progress from a recoverable partial failure to a complete head crash with platter scoring.

If your NAS has mechanical symptoms (clicking, intermittent disconnects, slow access on specific shares), power it down. Do not enable SSH recovery utilities. The drives need to be removed, connected through write-blocked imaging hardware, and cloned sector-by-sector before any reconstruction begins.

RAID Expansion Failures and NVMe SSD Cache Crashes

Two of the most destructive NAS failure scenarios involve interrupted storage operations rather than simple drive death.

RAID expansion failures (mdadm reshape): Adding a new drive to a RAID 5 or converting RAID 5 to RAID 6 initiates a reshape operation. The NAS reads, recalculates parity, and writes data across all members simultaneously. If a drive fails or the NAS loses power mid-reshape, the array is left with a fractured stripe size and split parity mapping. We recover this by determining the reshape progress offset in PC-3000 RAID Edition and building a custom virtual configuration that maps pre-reshape geometry to post-reshape geometry across the cloned images. For interrupted NAS migrations and expansion failures, imaging all members before any repair attempt is critical.

NVMe SSD cache failures: Synology and QNAP units support M.2 NVMe SSDs as read/write cache. In write-cache mode, incoming data hits the SSDs first (dirty cache) before flushing to the mechanical storage pool. If the NVMe cache volume crashes or the SSD degrades before flushing completes, the HDD pool holds an incomplete filesystem. Recovery requires imaging the failed NVMe cache drives separately, reconstructing the flash translation layer, and merging the unflushed cache data back into the HDD storage pool offline. This is a multi-layer reconstruction: enterprise Synology models with NVMe cache pools are the most common source of this failure pattern.

The NVMe cache partition contains "dirty" blocks: data written to the SSD but not yet flushed to the mechanical HDD pool. Standard array reconstruction from the HDD members alone produces a volume with missing or corrupted recent files.

We image both the NVMe cache drives and all HDD members, reconstruct the base RAID array from the HDD clones, then use UFS Explorer Professional to detect the SSD cache partition and overlay it as a delta on top of the reconstructed LVM structure. This merges the orphaned NVMe blocks back into the filesystem, recovering recently modified databases, virtual machines, and documents that existed only in the unflushed write cache. Running fsck or allowing the NAS to "repair" the volume would permanently discard these cache-only blocks.

Enterprise Business-Continuity NAS Recovery: RTO, RPO, and Snapshot Targeting

Business-continuity planners need three numbers from a NAS recovery engagement: how long until data is back (RTO), how much recent data is lost against the last consistent state (RPO), and whether the underlying filesystem preserves enough history to roll back a ransomware event without paying the attacker. Those numbers shift by NAS class, RAID failure mode, and filesystem.

Recovery Time Objectives by NAS Class

Logical and firmware work on healthy members clears in days. Mechanical work on helium-sealed enterprise drives runs weeks because donor head packs must match the exact platter count, motor class, and firmware revision of the original. The table below shows the working range we quote at intake for each NAS class; the clock starts when every member has arrived at the lab.

RTO expands past these ranges when SAS parity is interleaved with custom stripe widths (Dell PERC H740P non-standard geometries), when donor drives must be sourced from secondary markets (discontinued helium SKUs), or when the array has hardware-level encryption tied to the controller boot ROM and the ROM has been wiped. A $100 rush fee moves your engagement ahead of the standard intake queue and compresses imaging from days to 24-48 hours on healthy members; rush fee to move to the front of the queue. Mechanical work and donor sourcing still run in parallel on their own clocks regardless of rush status.

Recovery Point Objectives: Degraded Array vs. Two-Drive-Fail

RPO on a NAS is determined by how much parity survived the failure event. A single failed member is recoverable to the second of failure because every write through the incident was still striped across surviving members.

A second failure before rebuild completes destroys parity; RPO collapses back to the last consistent on-disk state, which means the last successful snapshot, scrub, or filesystem flush.

Degraded single-member failure (RPO = zero to seconds)

One drive drops, the array runs in degraded mode, every write continues to stripe across surviving members and parity is computed against the degraded state. Once we image the surviving members and the failed member is recovered through clone imaging or donor swap, virtual RAID 5 parity reconstruction against the clone set yields data up to the moment the first member dropped. User data loss is zero.

Two-drive-fail on RAID 5 or SHR-1 (RPO = hours to days)

Parity is destroyed. The best recoverable state is whichever on-disk consistency point survived the second failure: the most recent Btrfs or ZFS snapshot boundary, the last successful scrub, or the last full filesystem flush. Any write-cache-inflight data (dirty NVMe cache blocks from an SSD cache pool, unflushed LVM blocks on QTS) is at risk and may only partially reassemble from the cache SSD clones.

Ransomware Snapshot Recovery on Btrfs and ZFS

Yes, we roll back pre-infection snapshots on Btrfs volumes (Synology Hyper Backup snapshots, QNAP Snapshot Vault) and on ZFS pools (TrueNAS zvol snapshots) without paying threat actors. Both filesystems use Copy-on-Write: the original unencrypted data blocks remain on the platters after ransomware writes its encrypted replacement, and stay recoverable until garbage collection or a scrub overwrites them. For a general overview of our approach to ransomware recovery, see that page; the NAS-specific procedure is below.

1. Write-block every member at intake. No writes to the infected NAS. Dirty shadow-copy blocks stay recoverable only until overwrite; any post-infection boot attempt or filesystem repair accelerates block loss.
2. Image each member offline through PC-3000 or DeepSpar with conservative retry settings so weak reads do not escalate head wear on marginal members.
3. Assemble the ZFS pool or Btrfs volume read-only from the clones in the lab. Enumerate the full snapshot chain. Match snapshot UUIDs and transaction-group IDs against the timestamp of the first encrypted file header observed on the array to isolate the newest pre-infection generation.
4. Roll back the filesystem to that snapshot on the clone set. Extract user data from the rolled-back tree. The original infected members are never mounted and are never modified; we return clones or fresh destination media.

Recent Deadbolt and QLocker variants scrub the Btrfs snapshot store as a post-encryption step, destroying the snapshot tree itself. When the snapshot chain is gone, the fallback is B-tree forensic reconstruction of extent-tree nodes from the raw cloned images. That path has a lower success rate than snapshot rollback and depends on how much block-level overwrite the ransomware completed before it was stopped.

fsck and btrfs check --repair: Why We Do Not Run Them

We do not run btrfs check --repair or fsck -y on a damaged NAS member. The Btrfs manual states the repair flag can fatally damage a volume on a corrupted chunk tree, and ext4 e2fsck orphan-inode processing truncates files whose inode tables were journaled but whose data extents were flushed to disk before the crash. Both tools write to the only remaining copy of the damaged metadata.

btrfs check --repair risk

Rebuilds the extent tree and recalculates block checksums in place. If the chunk tree that maps logical addresses to physical offsets is already damaged, the repair walks into corrupted nodes, orphans subvolumes from the root tree, and destroys the filesystem structure past the point where offline reconstruction can recover it. Running this command is the single most common reason a recoverable Btrfs NAS arrives unrecoverable.

e2fsck -y risk on ext4

Auto-answers yes to every prompt. On a partially replayed JBD2 journal where the journal still references inode-table updates for data extents that already reached the platters, the orphan-inode pass truncates those files to zero length. The journal reports consistent state; the user data is gone.

Our counter-procedure: parse B-tree node headers directly on the clones with hex tooling, walk the extent tree offline, and extract files by traversing valid leaf nodes manually. This is slower than an in-place repair but does not write back to the damaged metadata. NAS volumes hosting database workloads are the highest-value targets for this workflow because MSSQL .mdf files, PostgreSQL data directories, and MySQL InnoDB tablespaces store pointers inside their own internal structures that also need careful handling at the application layer; see SQL Server and enterprise database extraction for the application-side procedure that runs after filesystem-level recovery. Recovery for NAS arrays operates under our no-fix-no-fee guarantee regardless of which filesystem path the engagement takes.

Phison E18 NVMe Cache Firmware Degradation

Enterprise NAS units running an M.2 NVMe SSD cache (Kingston KC3000, Corsair MP600 Pro, and several generic NAS-branded cache sticks) use the Phison E18 controller. Early firmware revisions on this controller family exhibit random-read performance degradation under sustained IO, where the controller enters a throttled state that returns correct data at a fraction of expected throughput. To DSM or QuTS hero, this looks identical to a dying mechanical member: timeouts, dropped commands, cache pool ejection. Any dirty blocks that had not yet been flushed from the cache to the HDD pool are stranded.

The recovery path uses PC-3000 Portable III to stabilize the Phison E18 controller state through the service-area command set, extract the dirty cache blocks from the NVMe translation layer directly rather than over the NVMe admin interface, and merge them back into the reconstructed HDD pool using UFS Explorer Professional's cache-delta overlay. This is the same framework described above for other cache failures but is specific to the E18 firmware signature. See our NVMe SSD data recovery page for the controller-level details that apply when the cache drive itself is the submitted device.

How Do We Recover Data from a Failed NAS?

We recover NAS arrays using a six-step image-first workflow: document the configuration, clone each member through write-blocked channels with PC-3000 and DeepSpar imaging hardware, capture RAID metadata, reconstruct the array offline from images, extract files, and deliver verified data.

1. Free evaluation and diagnostic: Document NAS model, RAID level (SHR, RAID 5, RAID 6, etc.), member count, encryption status, and any prior rebuild or repair attempts. No experiments run on original drives.
2. Write-blocked forensic imaging: Clone each member drive using PC-3000 and DeepSpar hardware with head-maps and conservative retry settings. Donor part transplants are performed for members with mechanical failures before imaging begins.
3. Metadata capture: Copy RAID headers and superblocks. Record stripe sizes, parity rotation, member offsets, and filesystem type (Btrfs, EXT4, XFS, ZFS).
4. Offline array reconstruction: Assemble the virtual array from cloned images only. Validate parity consistency and filesystem integrity across the reconstructed volume. No data is written to original drives at any point.
5. Filesystem extraction and recovery: Rebuild or correct the filesystem on the clone, carve fragmented files where needed, and verify priority data such as shared folders, virtual machines, and databases.
6. Delivery and purge: Copy recovered data to your target media, verify file integrity with you, and securely purge all working copies on request.

Which NAS Filesystems and RAID Modes Do We Support?

We recover data from Btrfs, EXT4, XFS, and ZFS filesystems across Synology SHR/SHR-2, standard RAID 0/1/5/6/10, and QNAP QuTS hero ZFS pools. Each filesystem requires different metadata parsing and reconstruction techniques.

Synology SHR / SHR-2

Synology Hybrid RAID uses mdadm with variable-size partitions to mix drive capacities. SHR-2 adds dual parity equivalent to RAID 6. We parse the custom partition layout and mdadm superblocks from each member image.

Btrfs on NAS

Synology DSM 7+ defaults to Btrfs for data integrity features (checksums, snapshots). Btrfs stores metadata in a tree structure across members. We reconstruct the chunk tree and device tree from imaged copies to locate and extract files.

ZFS (QNAP QuTS hero)

QNAP's QuTS hero uses ZFS with 128-bit checksums and copy-on-write. ZFS pool metadata is distributed across all vdevs. We clone the members and attempt a read-only pool import. If the internal metadata tree is severely damaged, engineers manually parse the array's Uberblocks and roll back Transaction Groups (TXGs) using specialized forensic software to restore pool access. See our ZFS pool recovery guide.

EXT4

The default filesystem on older Synology DSM and many Buffalo/Netgear NAS devices. EXT4 journal recovery and inode reconstruction from degraded arrays is a standard part of our workflow.

XFS

Used on some NAS configurations for large-file workloads (video editing, surveillance). XFS allocation group headers and B+ tree metadata are reconstructed from member images during recovery.

Encrypted Volumes

Synology and QNAP both offer volume-level encryption. Recovery of encrypted volumes requires the original encryption key or passphrase. Without it, the data cannot be decrypted regardless of array condition.

Advanced Offline Reconstruction Mechanics

Once each member is imaged and the RAID layer is virtually reassembled from clones, the filesystem-level damage determines the reconstruction approach. Each filesystem stores metadata differently, and the wrong repair command on the wrong filesystem type will overwrite the structures needed for recovery.

• EXT4 journal replay: When an EXT4-based NAS (common on older Synology DSM and WD My Cloud devices) crashes mid-write, the JBD2 journal contains uncommitted transactions. We parse the journal structures from the cloned array image, replay committed transactions to restore inode consistency, and reconstruct orphaned directory entries without running destructive fsck commands that would discard unlinked files.
• Btrfs chunk tree and subvolume reconstruction: Synology Btrfs stores a chunk tree that maps logical addresses to physical disk offsets across all members. In a degraded or crashed state, the ROOT_TREE may reference missing devices or corrupted B-tree nodes. We scan the raw hex of cloned member images for B-tree node headers, rebuild the chunk mapping manually, and relink orphaned subvolumes (including snapshots) back to the root namespace. This process recovers shared folders even when DSM reports the volume as unrecoverable.
• ZFS Uberblock rollback: On QNAP QuTS hero devices, ZFS maintains a ring buffer of Uberblocks, each pointing to a different Transaction Group (TXG). When the active Uberblock references a damaged TXG (causing pool import I/O errors), we extract the metadata from cloned images, locate older intact Uberblocks in the ring, and force a read-only pool import targeting the last clean TXG. This rolls the filesystem state back to before the corruption event.

iSCSI LUN and Virtual Machine Recovery on NAS Storage

Enterprise Synology and QNAP deployments frequently host iSCSI targets for VMware ESXi, Proxmox, and Hyper-V hypervisors. When the NAS fails, iSCSI LUNs are not visible as standard shared folders. They exist as raw block devices stored as sparse files within the @iSCSI directory on QNAP or managed through Synology's LUN layer. Recovery requires a two-stage logical extraction.

First, we reconstruct the underlying NAS filesystem (Btrfs, EXT4, or ZFS) from cloned member images to locate the sparse files representing each LUN. Second, we mount those raw LUN images using UFS Explorer Professional or R-Studio to parse the internal virtual filesystem: VMFS for ESXi, NTFS or ReFS for Hyper-V, or raw disk images for Proxmox QEMU.

We extract .vmdk, .vhdx, and flat image files directly from the reconstructed block layer without relying on the NAS operating system to mount damaged LUNs.

For NAS arrays where an iSCSI LUN was accidentally deleted, we scan unallocated space on the member images for orphaned file headers. For virtual machine recovery from server environments, the same LUN extraction workflow applies whether the host was a dedicated server or a NAS acting as a SAN target.

How We Handle Hardware and Software Encrypted NAS Arrays

Synology DSM uses ecryptfs or LUKS-based encryption managed through its Key Manager. QNAP QTS/QuTS hero uses AES-256 volume-level encryption with a password or key file.

In both cases, the encryption layer sits above the filesystem and below the shared folder structure. The encrypted data is stored on-disk; the NAS hardware does not contain a dedicated encryption chip that locks sectors at the drive level.

Our recovery process for encrypted NAS volumes follows the same imaging-first workflow. We clone every member drive through write-blocked hardware, reconstruct the RAID and LVM layers offline, and assemble the encrypted volume from images.

Decryption happens after reconstruction using the client-provided encryption key, passphrase, or exported .key file. If the key is lost, the data remains AES-256 encrypted and cannot be recovered by any lab, including ours.

Some NAS devices (particularly enterprise QNAP models) support hardware self-encrypting drives (SEDs) with OPAL 2.0. These drives lock at the controller level and require the NAS chassis or its stored authentication key to unlock. If you have an SED-based NAS, ship the chassis along with the drives so we can attempt authentication before imaging.

Consumer NAS vs. Enterprise NAS: How Drive Architecture Affects Recovery

Recovery complexity depends on the hard drive architecture inside the NAS chassis. Consumer-grade NAS arrays populated with SMR drives and enterprise arrays using helium-sealed drives present different mechanical and firmware challenges during imaging.

Consumer NAS Arrays and SMR Drive Complications

Budget NAS devices (2-bay and 4-bay desktop units from Synology, QNAP, and WD My Cloud) are frequently populated with consumer drives that use Shingled Magnetic Recording (SMR). SMR overlaps data tracks to increase capacity, which requires a complex internal translator layer to manage writes. When an SMR drive fails during a RAID rebuild, the translator often corrupts before the platters do, producing IDNF (ID Not Found) errors or a capacity that reports as 0 bytes.

Standard imaging alone cannot read through a corrupted SMR translator. We use PC-3000 terminal commands to reconstruct the translator module, restoring the mapping between shingled zones and their physical locations on the platters before write-blocked sector imaging can begin. This adds a firmware repair step to every affected member in the array.

Enterprise NAS and Helium-Sealed Drive Recovery

Enterprise NAS enclosures and rackmount storage (Synology RackStation RS series, FlashStation FS series, QNAP enterprise models) typically contain helium-sealed drives with higher platter counts. Helium reduces internal drag, allowing 8-10 platters per drive at 16TB-20TB+ capacities.

When a helium drive requires mechanical work (head swap or motor replacement), the sealed chamber cannot be opened on a standard laminar-flow clean bench. Introducing ambient air changes the internal aerodynamics and causes replacement heads to crash immediately. We perform helium drive mechanical recoveries in a controlled glovebox environment with atmospheric management, then image through DeepSpar or PC-3000 hardware. The helium refill and specialized containment add cost ($400-$800 helium surcharge per member) and time compared to standard air-bearing drives.

NAS-Specific Firmware Pathologies: WD Red, Seagate IronWolf, Toshiba N300

Drives marketed for NAS environments suffer from documented, model-specific firmware defects that cause them to drop out of otherwise healthy RAID arrays. The NAS management interface reports a drive failure, but the root cause is a firmware trap rather than mechanical death. These firmware-level failures require PC-3000 terminal access to resolve before imaging can proceed.

WD Red (SMR variants): Module 190 Translator Corruption

Smaller-capacity WD Red drives using SMR are prone to Module 190 translator failure during idle garbage collection. The translator maps logical blocks to physical shingled zones; when it corrupts, the drive spins normally but returns no user data. We clear the overfilled Module 32 relocation list using PC-3000 WD modules, patch Module 02 configuration, and repair the T2 translator in RAM or read the raw shingle bands via Physical Block Access (PBA). This is a firmware-only repair with no mechanical intervention required.

Seagate IronWolf: SC60 Sync Cache Timeout

The SC60 firmware revision contains a cache synchronization timeout bug. When the NAS controller issues a SCSI "synchronize cache" command, the drive firmware stalls beyond the controller's timeout threshold, causing TrueNAS, Synology DSM, or hardware RAID controllers to eject the drive as failed. The platters and heads are mechanically healthy. We connect through the drive's diagnostic serial port, disable the volatile cache via terminal to avoid the timeout, and clone the raw data through PC-3000 or DeepSpar imaging hardware before reconstructing the array offline.

Toshiba N300: Thermal Fly-Height Control Drift

Toshiba N300 drives in tightly packed NAS chassis are susceptible to thermal fly-height control (TFC) drift when operating temperatures exceed 55-60°C. Heat causes the head slider to expand, confusing the TFC logic and producing escalating Seek_Error_Rate SMART counts. The NAS marks the drive as failing and may eject it from the array. We use PC-3000 to reduce the TFC heater DAC values and read the drive with modified fly-height clearance settings that compensate for the thermal expansion, imaging the platters without risking a heat-induced head crash.

NAS Ransomware Recovery: Deadbolt, QLocker, and eCh0raix

NAS-specific ransomware (Deadbolt, QLocker, eCh0raix) targets Internet-exposed Synology, QNAP, and ASUSTOR devices by encrypting shared folders. The underlying RAID geometry usually remains intact; recovery focuses on filesystem-level forensic extraction from cloned member images rather than paying the ransom.

These ransomware variants exploit known CVEs in the NAS firmware's web management interface. Deadbolt encrypted files on ASUSTOR and QNAP devices by targeting individual files with AES encryption and replacing the login screen with a ransom demand. QLocker compressed files into password-protected 7z archives.

eCh0raix used OpenSSL-based encryption and targeted both Synology and QNAP devices.

Our recovery process starts with write-blocked imaging of every member drive to prevent further encryption. For NAS arrays running Btrfs or ZFS, Copy-on-Write semantics mean the original unencrypted data blocks often still exist on the platters, even after the filesystem index has been updated to point to the encrypted versions.

We forensically isolate pre-infection snapshots and roll back the filesystem tree to a Transaction Group or subvolume state from before the attack.

For EXT4-based NAS systems without snapshots, we carve unallocated space on the cloned images for deleted, unencrypted file headers before the ransomware could overwrite those blocks. Recovery success depends on how much write activity occurred after the encryption event. For broader ransomware recovery scenarios beyond NAS devices, see our ransomware data recovery service.

How Much Does NAS Data Recovery Cost?

NAS recovery uses a two-tiered pricing model: a per-member imaging fee for each individual drive in the array, plus a final array reconstruction fee of $400-$800. For example, a 4-bay NAS means four separate imaging fees plus the reconstruction fee. If we cannot recover your data, there is no charge.

Why Choose Rossmann Group for NAS Recovery?

Rossmann Group combines PC-3000, DeepSpar imaging hardware, and component-level board repair in a single Austin lab. You communicate directly with the engineer performing the recovery, not a sales team or call center script.

NAS Recovery for IT Administrators, MSPs, and In-House IT Teams

Business NAS arrays carry production databases, client deliverables, and operational records that cannot be reconstructed from other sources. The intake workflow for enterprise customers and managed service providers differs from consumer recovery in four specific ways: how confidentiality is handled, who you talk to, how chain of custody is documented, and how multi-array engagements are priced.

NDA Workflow and Confidentiality

We sign mutual NDAs at intake before drives are shipped. Send your standard NDA, or request ours; turnaround on review is typically same-day. We are not HIPAA certified and do not sign Business Associate Agreements; arrays containing protected health information should not be sent to us. We are not SOC 2, ISO 27001, FedRAMP, or FERPA certified either; the controls we do have are documented on our data security page. If your compliance requirements mandate any of those certifications, the honest answer is to use a lab that holds them.

Direct Engineer Escalation

There is no account manager layer between you and the engineer working on the array. The person who images the members, parses the LVM headers, and reconstructs the Btrfs chunk tree is the person who answers your technical questions. For multi-vendor environments where the NAS is one node in a larger stack (Veeam targets, ESXi datastores, Proxmox backup repositories), this matters; the engineer can speak directly to your storage architect about reshape geometry, ZFS Transaction Group state, or LUN mount semantics without translating through a sales tier.

Chain of Custody for Enterprise Arrays

Drives are inventoried at intake by serial number, slot position, SMART snapshot, and visible damage. Imaging happens on isolated, write-blocked benches; the original members are not powered after the first clone pass except for targeted firmware operations. All working copies live on lab storage and are accessible only to the assigned engineer.

After delivery and your acceptance test, working copies are securely purged on request, documented with a deletion confirmation. Original drives ship back via tracked shipping. The full timeline is illustrated in the chain of custody timeline below; enterprise engagements add the deletion confirmation and serial-number-keyed intake report on request.

MSP, Multi-Array, and Recurring Engagement Pricing

Per-array pricing follows the published per-member tiers and the $400-$800 array reconstruction fee documented in the pricing table above. There is no separate MSP rate card published; volume pricing is set per engagement based on array count, the mix of logical versus mechanical work expected, and whether you handle the client relationship and billing or want us to communicate directly with the end customer. The no data, no charge guarantee applies per array, not per engagement; if we recover nothing from an individual array in a multi-array shipment, that array is not billed regardless of the others.

For multi-site or recurring engagements (managed service providers handling NAS recoveries for downstream clients, IT consultancies with repeat hardware failure patterns, or organizations with multiple branch offices each running their own appliance), include the array list, RAID level mix, and approximate member count when you contact us. Bundle pricing is quoted in writing before any drives are shipped. For enterprise rackmount arrays specifically (Synology RackStation, QNAP enterprise series, and full server platforms), the per-member logical work is identical to consumer arrays, but helium-sealed mechanical work uses helium HDD pricing. Helium cost: $400-$800 additional for head swap and surface damage tiers. This covers the helium refill required after opening the sealed chamber.

Expedited Turnaround

We do not sign formal uptime SLAs because recovery duration depends on what we find when imaging starts. A $100 rush fee per array moves your work to the front of the intake queue.

On healthy arrays, rush imaging typically completes in 2-4 days; mechanical work and donor sourcing extend the timeline regardless of priority because head swaps and donor matching have physical lead times that priority cannot shorten. For business continuity needs, ask for staged delivery at intake; once the array is virtually assembled from clones, we can extract priority paths (live databases, VM images, financial system folders) ahead of the remaining shared folders.

Engagement Inquiry

Email help@rossmanngroup.com or call (512) 212-9111 with the array list, RAID level, member count, drive models if known, and any prior rebuild or repair attempts. We respond with an NDA, a written quote, and shipping instructions.

There is no diagnostic fee; the evaluation is free, and pricing is fixed before any work begins. For RAID-only engagements where the array is built directly on a server controller (not a NAS appliance), the same intake workflow applies.

Data Recovery in Our Austin Lab

This footage shows actual recovery work at our Austin lab, including the imaging hardware and clean bench we use for NAS member drives with mechanical failures.

NAS Recovery by Manufacturer

We recover data from Synology, QNAP, Buffalo, ASUSTOR, Unraid, TerraMaster, WD My Cloud, Netgear ReadyNAS, and Drobo devices. Each manufacturer uses a different storage stack, RAID implementation, and filesystem layer; the recovery workflow is tailored to the specific architecture of the failed device.

QNAP TS-Series and QuTS Storage Architecture

QNAP devices use a multi-layered storage stack that complicates recovery beyond standard RAID reconstruction. A typical QNAP TS-series NAS (TS-453D, TS-873A, TS-h886) layers the Linux md driver for basic RAID redundancy, then wraps the array in LVM (Logical Volume Manager) for volume management, and on QuTS hero models adds ZFS with 128-bit checksums on top. QNAP's Qtier auto-tiering further distributes hot and cold data across SSD and HDD members using proprietary cluster map metadata.

When a QNAP fails, native QTS/QuTS repair options (Storage & Snapshots > Manage > Recover) attempt in-place reconstruction that writes to already-degraded members. Our process starts by removing the drives and imaging each one through write-blocked PC-3000 hardware.

From the cloned images, we virtually reassemble the md-raid array, manually parse LVM physical volume headers and logical volume records, and reconstruct the cluster map metadata to locate the actual filesystem layer (EXT4 on QTS, ZFS on QuTS hero). Only after all metadata layers are verified do we extract files from the reconstructed volume.

Synology Hybrid RAID (SHR) and Btrfs Reconstruction

Synology DiskStation Manager (DSM) uses SHR (Synology Hybrid RAID) to allow mixed-capacity drives in a single storage pool. SHR works by partitioning each drive into multiple segments and creating separate mdadm arrays from matching-size partitions, then combining them under LVM. SHR-2 adds dual parity (functionally equivalent to RAID 6) for two-drive fault tolerance.

This multi-layer partitioning means a 4-bay Synology with mixed drives may contain 3-4 separate mdadm arrays stitched together, each with different member assignments.

DSM 7 and later default to Btrfs, which stores filesystem metadata in B-trees distributed across the underlying block devices. Recovering a Btrfs-on-SHR volume requires reconstructing each mdadm superblock from member images, reassembling the LVM layer, and then parsing the Btrfs chunk tree and device tree to map logical addresses to physical locations on the cloned images.

Older Synology units running EXT4 use journal-based recovery instead, where the EXT4 journal and inode tables are reconstructed from the assembled array image.

We never perform in-place SHR rebuilds on degraded pools. Forced rebuilds stress already-failing members by writing parity data across every stripe. If a second drive fails during rebuild, the array is lost. Imaging first, then reconstructing offline from clones, eliminates this risk.

Recovery by Symptom

Lab Location and Mail-In Service

All NAS recovery work is performed in-house at our lab: 2410 San Antonio Street, Austin, TX 78705. Walk-in evaluations are available Monday - Friday, 10 AM - 6 PM CT. For clients outside Austin, we accept mail-in shipments from all 50 states. Your drives stay in our lab under chain-of-custody from intake through delivery.

How We Handle Your Drives

Every drive is inventoried by serial number at intake, cloned through write-blocked hardware, and kept on isolated lab storage under chain-of-custody from intake through delivery. Working copies are securely purged on request after your data is confirmed.

NAS arrays contain business files, client deliverables, and records that cannot be re-created from other sources. Every drive that enters our lab follows the same custody protocol regardless of array size or data sensitivity.