Overview of Configure Boot-Time Defragmentation window
Certain versions of Windows (Windows 2000 and later) contain system files that cannot be accessed when Windows is loaded. Because these system files are used constantly and are dynamically growing and shrinking in size every day, they can become highly fragmented over time.
Once Windows has started, it locks these files, so the defragmentation of these files has to run at boot-time. The System File tab allows you to set up boot-time defragmentation for the system files you specify.
Select the one or more types of system files that you want to be defragmented:
Defragment the Registry Hives. Registry Hives are the Windows main storage area for all system configuration data. Windows constantly accesses and modifies these files, and they can become highly fragmented over time.
Defragment the System Page File. The system page file is a large file where Windows store its virtual memory data. Because this file grows as you use your PC, it can become quickly become fragmented.
Defragment the MFT. The MFT (master file table) is a large database that stores information about all the files on your system. It is used very frequently by Windows and can become highly fragmented.
Set the frequency of the defragmentation by selecting one of these two options:
Next restart only. The selected file or files will be defragmented the next time your start or restart your computer. This sets up the boot-time defragmentation for one use.
Each restart. The selected file or files will be defragmented every time you start or restart your computer.