启动Win7系统,VHD文件也可以做到

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  很多用户都知道可以在Windows 7中使用VHD文件创建一个虚拟系统,但是你不知道VHD文件还有一个神奇的功能,那就可以利用VHD文件启动Win7系统,有兴趣的朋友们都可以一起来瞧瞧哦.

  Windows 7的引导程序也同样包含了对VHD文件的读写驱动,因此在装有Windows 7引导程序(Boot Loader)的计算机上,可以通过配置BCDEdit的方式,把VHD上的操作系统加入到启动时显示的多系统选择菜单。

  下面我们来看一下具体的步骤:

  注意,我们不能在物理计算机上通过光盘把系统安装到VHD文件。首先我们需要一个已经安装了操作系统的VHD文件,这可以通过几种方式来完成:

  1. 在Virtual PC或者Hyper-V中完成安装,并且运行sysprep,然后关机,这是的VHD文件可以被Windows 7的Boot Loader启动。

  2. 使用ImageX工具,把之前备份的操作系统镜像文件(ImageX格式)恢复到VHD中。

  看到这里,大家不免有一些问题:从VHD启动之后的系统,到底是运行在虚拟机上?还是直接运行在物理硬件之上?从VHD启动,还需要哪些必备的条件?是否会有性能的损失?下面我来回答这些问题:

  1. Windows 7的引导程序和Windows 7本身都包含了对VHD文件的读写驱动程序,因此我们可以在启动计算机的时候,访问VHD并且从其上启动;我们也可以在Windows 7中直接创建、加载和卸载VHD文件。这些都是VHD读写驱动的功劳,跟Virtual PC或者Hyper-V没有直接的关系。因此Windows 7不需要安装任何虚拟化软件。

  2. 从VHD启动之后,计算机的操作系统直接访问硬件,不是以虚拟化的方式运行。

  3. 这里面唯一的区别,就是对文件系统读写访问的时候,需要经过额外的一层VHD读写驱动的解析,这里面有一些微量的I/O性能开销,但是跟虚拟化的情况相比,性能基本上接近了真机。我查了一些测试资料,有一组直接读取硬盘和读写VHD的比较,性能差别微乎其微。

  4. 因为对VHD的支持仅包含在Windows 7中,因此我们不能在Windows 7中创建VHD后通过光盘给VHD安装任何操作系统。

  Windows 7对VHD文件的内建支持,从此以后VHD文件的地位得到了提升它可以被操作系统认为是一块物理的硬盘进行管理和读写。我们知道,现在启动系统的方式多种多样,可以从光盘、硬盘、软盘、U盘、网络等等不同的渠道来完成。既然VHD可以被Windows 7认为是一块独立的物理硬盘,那么我们是否可以从VHD启动操作系统呢?答案是肯定的,具体操作步骤在上文有了详细的介绍,当然啦,上文的介绍仅仅是对这个功能的一些简单介绍和概括,相信大家在今后的应用中会有更多的体会和收获。

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