by 
The Curious Bag
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<h4 class="dechead">On One Hand: Schedule it weekly or monthly
Set up a schedule to have your computer automatically defragment your hard drive once a week or once a month, depending on how hard you use your computer. The more often you use your computer, the more often you should defrag it to maintain the optimum speed for your machine.
On the Other: Whenever it's needed
Defragmenting your hard drive increases the speed of your computer by helping it run more efficiently. It's not necessary until you begin to notice a change in the overall speed and effectiveness of your computer. Running the defragmenting program regularly costs you time with little payback.
Bottom Line
Defragmenting your hard drive needs to be done to make sure your computer runs effectively, but there is little benefit to running the program on a regular basis. However, if you are not likely to remember to perform the task, setting up an automatic schedule will increase the effectiveness of your computer in the long run.
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