I don't really see an importance in defragmenting and feel that the Windows built in does a fine job.
Answer
Windows build-in defragmenter does not have the strength to keep up with
fragmentation. As fragmentation builds up, it becomes a much harder challenge to
handle. Fragmentation builds up rapidly and in a very random manner. Even with
light computer activity or minimal use, your computer becomes fragmented. This
will usually be sooner than later and will often result in a hit against your
system’s performance. Eventually, this will also diminish the reliability of the system. Even cleaning up temporary internet files does not solve the need to defragment daily. Other files on your system will eventually become fragmented regardless.
You can compare the concept of a car needing an oil change. Without this normal maintenance, you would damage your engine. Although the concept applies, it is actually more critical for computers. Fragmentation occurs at the hard drive level. As fragmentation accumulates, the hard drive becomes the bottleneck. Often, our hard drives spin at the same revolutions per minute (RPM- similar to a car's engine RPM) that our car’s engines do. Also consider that most of us are usually at our computers longer than we are in our cars.
This requires the need for daily defragmentation. A task that the built-in defragmenter can not stand up against. Diskeeper offers a complete easy-to-use interface and preset scheduling options which make it easier than ever to schedule defrag jobs. Diskeeper removes the need to ever have to remember to defragment your computer. This is because it runs using "Set It and Forget It" technology.
It is recommended that you purchase or try Diskeeper and set it up to run at least once per day. This ensures peak performance. Keeping in an effective schedule (that suits your life style and use of the computer); you can ensure a constant return of your investment, your computer.