ERROR_SVHDX_UNIT_ATTENTION_OPERATING_DEFINITION_CHANGED 0xC05CFF06

Hex 0xC05CFF06 · Decimal -1067647226 · Type NTSTATUS

WINDOWS

The data storage format of the device has changed, resulting in a Unit Attention condition.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_SVHDX_UNIT_ATTENTION_OPERATING_DEFINITION_CHANGED is a Windows error code (NTSTATUS 0xC05CFF06) reported by Windows. Its official message is: “The data storage format of the device has changed, resulting in a Unit Attention condition.”

How to fix ERROR_SVHDX_UNIT_ATTENTION_OPERATING_DEFINITION_CHANGED

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_SVHDX_UNIT_ATTENTION_REGISTRATIONS_PREEMPTEDERROR_SVHDX_UNIT_ATTENTION_RESERVATIONS_RELEASEDERROR_SVHDX_UNIT_ATTENTION_RESERVATIONS_PREEMPTEDERROR_SVHDX_UNIT_ATTENTION_CAPACITY_DATA_CHANGEDSTATUS_SVHDX_UNIT_ATTENTION_OPERATING_DEFINITION_CHANGEDSTATUS_SVHDX_UNIT_ATTENTION_REGISTRATIONS_PREEMPTEDERROR_SVHDX_RESERVATION_CONFLICT

Source: Microsoft WinError.h

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