A script helps to compact vhd/vhdx.

CompactVHD.bat

@echo off

if [%1]==[] (
echo ========= 使用说明=========
echo 请将文件拖放到该批处理上。
echo 按任意键退出...
pause>nul
exit /B 1
) else (
del /q DiskPart_compact_temp >nul 2>nul
echo select vdisk file="%1">>DiskPart_compact_temp
echo detach vdisk>>DiskPart_compact_temp
echo attach vdisk readonly>>DiskPart_compact_temp
echo compact vdisk>>DiskPart_compact_temp
echo detach vdisk>>DiskPart_compact_temp
echo attach vdisk>>DiskPart_compact_temp
start /wait diskpart /s DiskPart_compact_temp
del DiskPart_compact_temp
echo 运行完成，按任意键退出。
pause>nul
)