HRESULT 0x800423F6 (VSS_E_BREAK_REVERT_ID

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The shadow copy set break operation failed because the disk/partition identities could not be reverted. The target identity already exists on the machine or cluster and must be masked before this operation can succeed.

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VSS_E_WRITERERROR_RECOVERY_FAILED	VSS_E_LEGACY_PROVIDER

VSS_E_BREAK_REVERT_ID_FAILED

VSS_E_BREAK_REVERT_ID_FAILED A shadow-copy set break operation could not revert disk or partition identities because the intended identity already exists on the machine or cluster. The collision must be resolved before the operation can safely continue.

What to check

Inventory disk signatures and GPT identifiers on the target and locate the conflicting identity.
Use a controlled restore or transport workflow that masks or removes conflicting target identities before retrying.
In a cluster, coordinate changes with cluster storage ownership; do not alter disk identifiers on an active production disk without a restore plan.

diskpart

list disk

Microsoft: VSS documentation portal

Microsoft: Failover clustering overview

Microsoft: VSS requesters

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