系统是WIN7 64位旗舰版，昨天自动更新升级了SP1后发现C盘突然多了近10G。。。到文件夹下一看发现winsxs文件夹体积块10G了
以管理员身份运行CMD，输入
dism /online /cleanup-image /spsuperseded /hidesp（可以复制）
便可删除安装SP1期间系统的备份文件（近1G）
删除后的影响：无法卸载SP1
The command needs to be run from an elevated command prompt and you cannot uninstall the Service Pack after it completes
I then did the same on my desktop and recoverd an almost identical ammount.
Pre CleanUp
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