Many users know that you can create a virtual system using VHD files in Windows 7, but you don't know that VHD files have a magical function. You can use the VHD file to start Win7 system. Interested friends can come together. Oh.
Windows7 boot program also includes a write driver of the VHD file, so the computer is equipped with Windows7 boot program (of bootLoader), and can be disposed of BCDEdit, the operation of the VHD The system is added to the multi-system selection menu displayed at startup.
Here we look at specific steps:
note that we can not CD to install the system to a VHD file on a physical computer. First, we need an operating system VHD files have been installed, and this can be done in several ways:
1. completed in VirtualPC or Hyper-V installed and running sysprep, and then shut down, this is the VHD files can be started by the Windows 7 BootLoader.
2. Use the ImageX tool, the operating system image file (ImageX format) before restoring a backup to a VHD.
see here, we can not help but have some problems: from the system after the VHD boot, in the end is running on a virtual machine or run directly on physical hardware boot from VHD, which also need essential?? ?? will there be a loss of performance conditions Let me answer these questions:
boot program 1.Windows7 and Windows7 itself contains a read-write drivers for VHD files, so we can start the computer At the time, access the VHD and boot from it; we can also create, load and unload VHD files directly in Windows 7. These are the credits of the VHD read-write driver and have no direct relationship with VirtualPC or Hyper-V. So Windows 7 does not need to install any virtualization software.
2., the computer operating system to access the hardware directly, not after running from VHD boot virtualized manner. There
3. The only difference is that read and write access to the file system when the need to go through an extra layer of VHD drive to read and write analytical, and there are some trace of I /O performance overhead, but Compared to the case of virtualization, performance is basically close to the real machine. I checked some test data, and there was a comparison between the direct read hard disk and the read and write VHD. The performance difference was negligible. 4.
because support for the VHD are included only in Windows7, so we can not create a VHD in Windows7 VHD to install any operating system on CD-ROM.
Windows7 built-in support for the VHD file, the VHD file status since then it has improved the operating system can be considered to be a physical hard disk management and to read and write. We know that there are many ways to start the system, which can be done from CD, hard disk, floppy disk, USB flash drive, network and so on. Since VHD can be considered as a separate physical hard disk by Windows 7, can we start the operating system from VHD? The answer is yes. The specific steps are described in detail above. Of course, the above introduction is only Some brief introductions and generalizations of this function, I believe that everyone will have more experience and gains in future applications.