When your computer writes information onto your hard drive, it does not always write information in the same location on the actual hardware. A section of a file can be written near the beginning of the disc, whereas the rest of that file could be written near the end. This causes programs to run slowly, as the computer spends time in retrieving these file clusters from all over the disc. Defragmenting your computer sorts all of your files [as well as free space] in an orderly manner, in effort to reduce loading time. Here is how to do it.
Start Windows in Safe Mode. This is not mandatory, but it helps to avoid complications from other programs that are running in the background. This also speeds up and streamlines the process.
Uninstall any programs you do not use or need. It is best to uninstall programs prior to a defragmentation, as the newly-acquired free space will generally be located all over the hard drive, thereby giving rise to fragmentation.
Make sure that all unnecessary programs are closed. If you have already started in Safe Mode, then this has already been done.
Cancel any programs that are scheduled to run. If you have not manually scheduled any programs to run, then skip this step.
Delete any temporary files. This is done by running Disk Cleanup. To run the program, go to: START -> Run, and enter cleanmgr in the window.
Disk Defragmenter with two hard drives. Run the Disk Defragmenter Program. Go to START -> Run, and enter dfrg.msc in the window. Alternatively, launch it by going to Start -> Programs (or All Programs) -> Accessories -> System Tools -> "Disk Defragmenter". A window should appear. Select the hard drive in question and click "Analyze" so you can see what the damage is, and then look at the report. If you want to continue: Make sure that your desired drive is selected [C: being the default drive], and click on the Defragment button.
Wait until the process is complete. This can take some time, even hours to complete. Sit back and relax as your computer organizes your fragmented files.
Defragment your computer overnight. If you have never defragmented your computer before, and you have a large hard drive, the process can take several hours.
The more often that you run the defragmenter, the quicker the process will be. Generally, once per month is good.
Remember that defragmenting takes the saved portions of all of your files and organizes them to help your computer run more efficiently. Keep in mind that some files (such as critical system files and boot procedure files) cannot be moved.
If the Defragmenter keeps restarting, and you have not already run your computer in Safe Mode, do so.
The free Defragmenter provided with the Operating System does a reasonable job as far as it goes, however it cannot defragment system files such as MFT or prioritise file placement according to usage. Commercial Defragmenters (such as Diskeeper, Perfect Disk and O&O)do a better job with these more difficult tasks.
Defragmentation is not needed on most Linux operating systems because the file system is designed to keep fragmentation at minimal.
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