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PE小常识:启动需耗费多少内存

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　　很多用户都对PE启动盘充满了好奇，究竟这个启动盘启动一次需要耗费我们多少的内存呢?也便是PE启动的占用多少内存的问题。我们该如何准确地知道这个数据呢?计算方法马上分享给大家。

　　什么是PE启动?

　　PE启动盘，其实就是一种紧急系统。可以通过设置BIOS的启动先后顺序使PE在电脑刚启动时优先引导启动，是使用工具在Windows界面下制作的一个简易的、临时的、应急用系统。

　　当本来的电脑系统出现问题时，如进入不了系统。但是电脑中又有重要资料未备份时，就可以使用PE系统进入电脑。对硬盘中需要备份的文件进行复制或剪切保存工作，其界面和Windows2000类似。 简单的讲，PE就等于是可视化，操作更简便的DOS。

　　PE启动时会占用多少内存的计算方法：

　　PE的启动内存和核心有关，大概为下面这个公式(只是大概)

　　1、用CAB压缩过的核心

　　X*2+16(单位MB)(X为未压缩时的核心大小)

　　2、不用CAB压缩的核心

　　X+32(单位MB)(X为未压缩时的核心大小)

　　这里就可以解释为什么NTFS IMG的核心一般不用CAB压缩，因为NTFSIMG格式的核心用CAB压缩效果很差，压缩率低，例如：50M的NTFS IMG用CAB压缩后才35M，而70M(里面有60M的文件)的FATIMG用CAB压缩后，体积变成了26-29M左右。所以NTFS IMG不用CAB压缩，体积减小不多，而启动内存要加倍，因小失大

　　关于安装配置文件txtsetup.sif的简单说明

　　相信玩过精简版系统的朋友都知道这个文件的用途，同样PE里也有这个文件，废话不多说，我就简单讲讲这个文件。

　　[WinntDirectories]

　　这个字段是用代码表示文件拷贝的目标文件夹，其根目录为%WinDir%即安装指定的Windows文件夹。

　　[SourceDiskFiles]

　　根据u盘启动前面设定的代码表示文件拷贝的具体细节。

　　下面三段为集成SATA SCSI等驱动时所用

　　[HardwareIdsDatebase]—硬件标识

　　[SCSI.load]——SCSI驱动加载

　　[SCSI]——SCSI设备说明

　　通过这篇文章的讲解，你明白了什么是PE启动，也明白了此启动究竟会占据我们多少内存了吧，精打细算的用户们，欢迎一起交流来计算下大家的PE启动究竟需要多少内存!

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