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STATUS_VOLMGR_EXTENT_NOT_IN_PUBLIC_REGION
STATUS_VOLMGR_EXTENT_NOT_IN_PUBLIC_REGION means that the requested extent is not in the allocatable public region of the dynamic disk. It is not safe to reinterpret this as ordinary unallocated space: the surrounding area may be a metadata, boot, partitioning, or otherwise non-volume region.
Windows VDS distinguishes a dynamic disk public region from other extent types. The correct response is to discover which region contains the proposed offset, not to move the extent boundary until the error disappears.
What to check
- Inspect the disk extent type and the exact offset/length proposed for the volume.
- Check whether a migration or restore tool used the whole-disk capacity instead of the dynamic disk's allocatable region.
- Keep reserved and metadata areas intact; writing a volume extent there can destroy the configuration needed to identify other volumes.
Microsoft: VDS disk extent types
Microsoft: Basic and Dynamic Disks
Microsoft: Volume Manager error codes
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