Defragmenting the hard drives of your computer is important especially for users who install lots of programs or perform lots of read and write operations on their hard drives (p2p users for instance). In a perfect world files would be written contiguously on the hard drive – in the world of windows they are not. Read operations waste more time because all the bits that make the file are not in one place but scattered around the complete hard drive. Defragmenting the drive moves them closer to each other to speed up loading times.

