QNAP disk missing after update
A member is absent from the expected set after firmware and reboot, but the cause may be hardware detection, RAID assembly, or metadata.
QNAP guidance →NAS recovery
Recover data from QNAP, Synology, TrueNAS, and other multi-disk NAS systems.
NAS recovery requires more than healthy-disk status. ADR evaluates the member set, RAID, storage pool, volume, filesystem, snapshots, and shared-folder layer before changing the system.
Record the NAS model, firmware, bay order, disk serial numbers, storage-pool status, symptoms, and prior actions.
QNAP and SynologyRAID, pool, volume, and shares
TrueNAS and FreeNASPool and member evaluation
Member-level accessOutside the failed appliance when appropriate
Image-first escalationFor unstable members
Recognize the failure
A green disk status does not prove that the data path is healthy.
NAS appliances combine several storage layers behind one interface. The recovery path depends on the layer that stopped presenting the expected data.
Synology healthy but data missing
DSM reports normal hardware while the expected volume, files, or shared folders are absent.
Synology guidance →Shared folders are empty
The NAS may be presenting a different mount, damaged filesystem, changed share path, or incomplete storage pool.
Empty-share guidance →RAID group degraded
A member has left the active RAID set even though installed disks may still pass SMART checks.
Degraded-group guidance →TrueNAS pool will not mount
The drives are detected but the expected pool, datasets, or volumes are not available after replacement or reboot.
TrueNAS guidance →More than one member failed
The NAS storage exceeded normal fault tolerance or another member became unreadable during repair.
Multiple-member guidance →A controlled recovery path
Start with the members and work upward to the shares.
- 1
Identify the present state
Review hardware detection, member order, RAID assembly, pool, volume, filesystem, snapshots, and shares.
- 2
Protect unstable storage
Image members that cannot safely support repeated reads and keep destinations separate from every source.
- 3
Reconstruct the storage stack
Recover the RAID or pool before interpreting volume, filesystem, dataset, and shared-folder structures.
- 4
Verify priority data
Check the directories, application files, backups, databases, or virtual-machine data the client needs.
Choose the recovery location and scope
The appliance and data may be able to remain onsite.
In most cases, ADR can begin from independently connected members while the appliance remains out of the recovery path. ADR confirms member condition, access, destination capacity, and the approved recovery plan before reconstruction.
Follow the failure to the right service
Choose the path that matches the failed layer.
Storage failures often cross controller, RAID, filesystem, virtualization, and application boundaries. These services connect the next layer without asking the failed system to make another decision.
Array-level failureRAID recoveryFor degraded, offline, foreign, or incomplete member sets beneath the NAS interface.Review this recovery path →Customer-retained custodyRemote RAID recoveryFor NAS cases where custody, data volume, or downtime favors work at the client location.Review this recovery path →Workload dependencyVirtualization recoveryWhen the NAS holds VMware datastores, virtual disks, or business-critical VMs.Review this recovery path →
Before another repair attempt
Describe the appliance, disks, storage pool, and missing data.
ADR will determine which storage layer failed and whether the case is appropriate for remote work, protected imaging, logical reconstruction, or physical escalation.