What does HRESULT 0xC05CFF0A (ERROR_VHD_SHARED) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The requested operation cannot be performed on the virtual disk as it is currently used in shared mode.

Could be also:
Constant	Type	OS
STATUS_VHD_SHARED	NTSTATUS	Windows

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ERROR_SVHDX_VERSION_MISMATCH	ERROR_SVHDX_NO_INITIATOR

ERROR_VHD_SHARED

ERROR_VHD_SHARED means the operation cannot run because the virtual disk is currently used in shared mode. Shared virtual disks and VHD Sets are used by clustered guest workloads and have additional operation restrictions.

What to check

Identify every VM and cluster role that currently uses the shared disk before planning maintenance.
Schedule an approved cluster-aware maintenance window; do not detach, merge, or resize the disk while it is in active shared use.
Use the management path supported by the guest-cluster and Hyper-V configuration rather than treating the file as an ordinary standalone VHDX.

Microsoft: Create Hyper-V VHD Set files

Microsoft: Manage virtual hard disks

Microsoft: Get-VHD

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