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This article talks about why you should clone hard drive in Windows 7 and how can you clone a hard drive in Windows 7 by using free partition magic.
After a long-time running, your computer may generate lots of junk files, like caches and random access memory (RAM), which makes it harder for operating system to locate needed files. However, rebooting may clear all or a part of such files so as to speed up your computer.
If users store and delete data on hard disk frequently, fragments are easy to emerge. If the disk is with a lot of fragments, it will do much extra work to seek data, which definitely slows the speed of our computer.
In addition, rebooting makes it possible to detect Windows update or software update. With the latest version of system or program, our computer is always running smoothly.

How to Clone Hard Drive in Windows 7?