Start Win7 system, VHD files can also be done

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 VHD files. Start Win7 system, interested friends can come together <.

Windows 7 bootloader also contains read and write drivers for VHD files, so the Windows 7 bootloader (Boot) On the Loader) computer, you can configure the BHDEdit to add the operating system on the VHD to the multi-system selection menu displayed at startup.

Let's take a look at the specific steps:

Note that we can't install the system to a VHD file on a physical computer via a CD. First we need a VHD file that has an operating system installed. This can be done in several ways:

1. Complete the installation in Virtual PC or Hyper-V, run sysprep, then shut down, this is The VHD file can be launched by the Windows 7 Boot Loader.

2. Use the ImageX tool to restore the previously backed up operating system image file (ImageX format) to the VHD.

Seeing this, you can't help but have some questions: Is the system after booting from VHD running on a virtual machine or running directly on physical hardware? What are the necessary prerequisites to boot from VHD? Conditions? Is there a performance loss? Let me answer these questions:

1. The Windows 7 bootloader and Windows 7 itself both contain read and write drivers for VHD files, so we can start While on the computer, 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 Virtual PC or Hyper-V. So Windows 7 does not need to install any virtualization software.

2. After booting from the VHD, the computer's operating system accesses the hardware directly, not in a virtualized manner.

3. The only difference here is that when reading and writing access to the file system, you need to go through an additional layer of VHD read and write driver parsing, there are some trace 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 VHD support is only included in Windows 7, we can't install any operating system on the VHD via CD after creating VHD in Windows 7.

Windows 7 has built-in support for VHD files. Since then, the status of VHD files has been improved. It can be managed and read and written by the operating system as a physical hard disk. 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 boot the operating system from VHD? The answer is yes. The specific steps are described in detail above. Of course, the above introduction is only It is a brief introduction and generalization of this function. I believe that everyone will have more experience and gains in future applications.