What is a Defrag?
Imagine your hard disk is a book, when your computer writes some more information (saves a file for example) it writes on the next free page in that book. When you delete a file it erases the text rather than ripping out the page so that it can be written on again. Then when the computer writes something new or wants to make a file bigger it finds the first empty piece of paper such as the part that you just erased and starts writing there. If there is not enough room it fills what space it has and flicks through the book to find the next empty piece of paper.
As you can imagine, after a while when the computer wants to write a few pages of information it will end up putting some on one page another paragraph on a later page and then the rest somewhere in the middle of the book. This means that when the computer comes to read the file it has to keep flicking forward and backwards through the book to read the whole file.
When you defrag the hard disk it re orders the information so that a whole file can be read in a single chapter without having to skip pages to find the next part.
Windows Defrag is a useful tool but it doesn’t give much information on what it is doing and it always seems to take a long time.
Defrag with Defraggler
Defraggler from Piriform can be downloaded for free and lets you watch the blocks of data be moved about into order. It is quick and has a nice report to give you a warm fuzzy feeling that it has done its job well.
I also feel the system runs that little bit quicker afterwards too.