why should i defragment my hard drive using windows 7

if you are using windows 7 beta, then you are lucky.

如何安装windows7windows7带磁盘的windows7系统的安装说明

windows 7 x64 archives - windows 64

how to defragment hard disks in windows 8

[22:58:01 inf] loaded 5 extensions[22:58:02 inf] using msbuild

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