HRESULT 0x80042418 (VDS_E_NOT_AN_UNALLOCATED

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Description:

The selected disk is not fully unallocated, so a blank-disk operation cannot continue.

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VSS_E_FSS_TIMEOUT	VDS_E_UNRECOVERABLE_ERROR

VDS_E_NOT_AN_UNALLOCATED_DISK

VDS_E_NOT_AN_UNALLOCATED_DISK means that the operation requires a fully unallocated disk, but VDS detected existing partitions, volumes, or allocation metadata. This differs from merely having some free space: the whole disk must meet the blank-disk precondition.

What to check

Inspect all partitions and volumes on the selected disk, including hidden or provider-managed entries.
Confirm that the workflow really requires a blank disk rather than an available unallocated extent on an existing disk.
Do not remove existing structures until the disk identity, data ownership, backup, and recovery consequences are explicitly confirmed.

Microsoft: VDS common return codes

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