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ERROR_VOLUME_NOT_CLUSTER_ALIGNED
The volume layout is not cluster aligned
ERROR_VOLUME_NOT_CLUSTER_ALIGNED reports that a storage operation requires alignment that the current volume layout does not satisfy. It is commonly relevant to low-level provisioning, virtualization, direct I/O, or storage-management code rather than ordinary file access.
Possible causes
- The partition or volume begins at an offset incompatible with the underlying device geometry.
- A virtual disk or copied image preserves an older alignment scheme.
- The requested operation requires physical-sector or allocation-unit alignment.
- Storage topology changed after cloning, tiering, or migration.
Diagnosis
Collect the partition starting offset, logical and physical sector sizes, allocation-unit size, and storage-stack topology. Compare the failing volume with a newly created volume on the same device. Do not infer alignment only from the visible filesystem cluster size.
Corrective action
Use supported storage-management tools to recreate or migrate the volume with the required alignment. In-place offset changes are risky and often unsupported. Back up data before repartitioning or converting storage layouts.
Developer note
Validate alignment constraints before issuing destructive provisioning operations and report the required boundary in diagnostics.
References
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