Optimize-VHD -Path "C:\VHDX\suspect.vhdx" -Mode Full If a differencing VHDX is corrupt and its parent is healthy:
$fixedVHD = Repair-VHD -Path "E:\Corrupt\data.vhdx" -Path "F:\Backups\data_clean.vhdx" -Passthru $fixedVHD | Format-List * repair vhdx powershell
# Get the volume letter (e.g., F:) chkdsk F: /f /r /x For non-structural corruption (e.g., block allocation issues): Optimize-VHD -Path "C:\VHDX\suspect
Repair-VHD -Path "C:\CorruptedVMs\server01.vhdx" -Path "D:\Backups\healthy_server01.vhdx" -Passthru mounts the VHDX read-only
# Recreate the differencing disk from healthy parent $parentPath = "D:\BaseImages\parent.vhdx" $newChildPath = "E:\VMs\newchild.vhdx" New-VHD -ParentPath $parentPath -Path $newChildPath -Differencing Advanced Script: Auto-Repair with Backup Fallback <# .SYNOPSIS Attempts to repair a VHDX file, falling back to a backup copy. .DESCRIPTION Uses Repair-VHD if possible. If that fails, mounts the VHDX read-only, runs chkdsk, and then replaces with a backup if corruption persists. #> param( [Parameter(Mandatory=$true)] [string]$VhdPath,