PageDefrag 可以用來重整一些系統檔案，包括分頁檔。因為這些系統檔案一開機就會被鎖定，所以一般的磁碟重整程式並無法重整這些檔案，而 PageDefrag 可以設定在下次或每次開機時重整系統檔案。另外 PageDefrag 也會顯示系統檔案在磁碟上的分散情況，如果碎片不是很嚴重的話就可以不用重整。

One of the limitations of the Windows NT/2000 defragmentation interface is that it is not possible to defragment files that are open for exclusive access. Thus, standard defragmentation programs can neither show you how fragmented your paging files or Registry hives are, nor defragment them. Paging and Registry file fragmentation can be one of the leading causes of performance degradation related to file fragmentation in a system.

PageDefrag uses advanced techniques to provide you what commercial defragmenters cannot: the ability for you to see how fragmented your paging files and Registry hives are, and to defragment them. In addition, it defragments event log files and Windows 2000/XP hibernation files (where system memory is saved when you hibernate a laptop).

PageDefrag works on Windows NT 4.0, Windows 2000, Windows XP, and Server 2003.

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