创建差分盘， 从VHD启动电脑

一、创建差分盘

    创建文件：workvhd.script:
        create vdisk file="D:\Hyper-V\Virtual Hard Disks\Windows 8.1 WorkVhd.vhdx"  parent="D:\Hyper-V\Virtual Hard Disks\Windows 8.1.vhdx"

    创建批处理：sonvhd.bat:      


        cd "D:\Hyper-V\Virtual Hard Disks"
        del /S /Q "D:\Hyper-V\Virtual Hard Disks\Windows 8.1 WorkVhd.vhdx"
        diskpart /s WorkVhd.script
        cmd

二、设置从vhd启动

以管理员身份运行cmd
C:\>bcdedit /copy {原启动项对应的guid} /d " VHD Description（标题）"

Note: This will Return the GUID of the Loader Object that you will use to replace below 
C:\>bcdedit /set device vhd=[driveletter:]\\ 
C:\>bcdedit /set osdevice vhd=[driverletter:]\\

Note: vhd=[driveletter:]\\ is the new syntax supported for BCDEdit.exe to locate VHD File and Bootmgr will locate the partition containing the VHD File to boot from.