PageDefrag is a legacy freeware system utility developed by Mark Russinovich for Windows Sysinternals (now owned by Microsoft) that defragments critical Windows files that are normally locked while the operating system is running. Core Functionality
Standard disk defragmentation programs cannot touch files that are actively locked by the Windows kernel. PageDefrag solves this by scheduling an offline, boot-time defragmentation. It runs in a pre-boot environment—similar to how chkdsk works—right before the operating system completely loads and locks the files.
It specifically targets and handles the placement of these major system files: pagefile.sys: The main virtual memory paging file.
Registry Hives: Core database files containing system configuration data (e.g., SYSTEM, SOFTWARE).
Event Viewer Logs: System, application, and security log files (*.evt).
hiberfil.sys: The hibernation image file where system memory is dumped on laptops.
Note: PageDefrag only reorganizes how these files are physically positioned on your hard drive to make them contiguous. It does not clean, compress, or optimize the inner data structure of the registry itself. Current Status and Compatibility Defragment locked system files with PageDefrag – Rarst.net
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