安装完Windows XP SP2和一系列补丁后，你会发现系统分区少了几百兆空间。经检查发现，在C:\Windows目录下有着不少以$NtUninstal开头的文件，有的可能还有$NtServicePackUninstall$和ServicePackFiles文件夹。下面介绍一下这些文件夹的来源。

       1.$NtServicePackUninstall$文件夹

          它是当卸载SP2时所需要的文件夹，当其被删除后就不能通过控制面板来删除SP2了。其实目前大多数系统安装盘都集成了Windows XP SP2，当系统安装完成后就不存在$NtServicePackUninstall$文件夹了。只有在SP1的情况下安装SP2升级包才会出现这个文件夹。如果不打算卸载SP2的话，这个文件夹完全可以删除。

       2.ServicePackFiles文件夹
     
          此文件夹中存在的是SP2安装文件，如果删除了，当添加新功能时可能要插入SP2的安装光盘。如果你的系统安装盘已经集成了SP2，那么也可以删除此文件夹。

       3.以$NtUninstal开头的文件夹

          安装补丁文件后产生的文件，用来卸载补丁文件。一般补丁安装了是不会卸载的，因此可以删除以释放空间

下图是笔者电脑中存在的可删除的补丁备份文件

它们的目录名如下：

$MSI31Uninstall_KB893803v2$,$NtUninstallKB873339$,$NtUninstallKB885250$,$NtUninstallKB885835$,$NtUninstallKB885836$,

$NtUninstallKB885884$,$NtUninstallKB886185$,$NtUninstallKB886677$,$NtUninstallKB887742$,$NtUninstallKB888113$,

$NtUninstallKB888302$,$NtUninstallKB890046$,$NtUninstallKB890859$,$NtUninstallKB891781$,$NtUninstallKB893066$,

$NtUninstallKB893086$,$NtUninstallKB893756$,$NtUninstallKB896358$,$NtUninstallKB896422$,$NtUninstallKB896423$,

$NtUninstallKB896424$,$NtUninstallKB896428$,$NtUninstallKB898461$,$NtUninstallKB899587$,$NtUninstallKB899588$,

$NtUninstallKB899589$,$NtUninstallKB899591$,$NtUninstallKB900485$,$NtUninstallKB900725$,$NtUninstallKB901017$,

$NtUninstallKB901190$,$NtUninstallKB901214$,$NtUninstallKB902400$,$NtUninstallKB904706$,$NtUninstallKB905414$,

$NtUninstallKB905749$,$NtUninstallKB908519$,$NtUninstallKB908531$,$NtUninstallKB910437$,$NtUninstallKB911280$,

$NtUninstallKB911562$,$NtUninstallKB911564$,$NtUninstallKB911565$,$NtUninstallKB911567$,$NtUninstallKB911927$,

$NtUninstallKB912812$,$NtUninstallKB912919$,$NtUninstallKB913446$,$NtUninstallKB913580$,$NtUninstallKB914388$,

$NtUninstallKB914389$,$NtUninstallKB916595$,$NtUninstallKB917344$,$NtUninstallKB917422$,$NtUninstallKB917537$,

$NtUninstallKB917734_WMP10$,$NtUninstallKB917953$,$NtUninstallKB918118$,$NtUninstallKB918439$,$NtUninstallKB918899$,

$NtUninstallKB919007$,$NtUninstallKB920213$,$NtUninstallKB920214$,$NtUninstallKB920670$,$NtUninstallKB920683$,

$NtUninstallKB920685$,$NtUninstallKB920872$,$NtUninstallKB921398$,$NtUninstallKB921883$,$NtUninstallKB922582$,

$NtUninstallKB922616$,$NtUninstallKB922760$,$NtUninstallKB922819$,$NtUninstallKB923191$,$NtUninstallKB923414$,

$NtUninstallKB923689$,$NtUninstallKB923694$,$NtUninstallKB923980$,$NtUninstallKB924191$,$NtUninstallKB924270$,

$NtUninstallKB924496$,$NtUninstallKB924667$,$NtUninstallKB925398_WMP64$,$NtUninstallKB925454$,$NtUninstallKB925486$,

$NtUninstallKB926255$,$NtUninstallKB926436$,$NtUninstallKB927779$,$NtUninstallKB927802$,$NtUninstallKB928090$,

$NtUninstallKB928255$,$NtUninstallKB928843$,$NtUninstallKB929338$,$NtUninstallKB929969$,$NtUninstallKB931836$

上述目录名均是Windows XP安装补丁时生成的备份文件，如果不打算卸载补丁的话，上述目录都可以删除，以释放硬盘空间。

作者：魏洪源