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 Copyright © 1998-1999 Mark Russinovich

 Last Updated January 14, 1999 v1.02
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     Introduction One of the limitations of the Windows NT
                  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.

                  PageDefrag works on Windows NT 4.0.

     Installation When you run PageDefrag (pagedfrg.exe) you will be
          and Use presented a listbox that tells you how many clusters
                  make up your paging files and Registry hives (SAM,
                  SYSTEM, SECURITY, SOFTWARE, .DEFAULT), as well as how
                  many fragments those files are in. If you feel that
                  these files are fragmented enough to warrant a shot at
                  defragmenting them, or if you want to defragment them
                  at every boot, select the appropriate radio button
                  choice and click OK.

                  When you direct PageDefrag to defragment, the next time
                  the system boots it will attempt to do so. Immediately
                  after CHKDSK examines your hard drives PageDefrag uses
                  the standard file defragmentation APIs (see my Inside
                  Windows NT Disk Defragmenting page for documentation of
                  these APIs) to defragment the files. As it processes
                  each file PageDefrag will print on the boot-time Blue
                  Screen the file name and its success at defragmenting
                  it. If it is successful at reducing the fragmentation
                  it will tell you the number of clusters the file
                  started with and the number it consists of after the
                  defragmentation.

                  In some cases PageDefrag may be unable to reduce
                  fragmentation on one or more of the files, and it will
                  indicate so on the boot-time Blue Screen. This can
                  happen either because there is not enough space on the
                  drive for defragmentation, or the free space itself is
                  highly fragmented. For the best results you should use
                  PageDefrag in conjunction with a commercial
                  defragmentation utility or my free Contig defragmenter.

           Sample This is a screenshot of PageDefrag showing paging and
       Screenshot Registry file fragmentation.

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