Whenever you use your drive, files are stored in different locations, written to and from each partition and files become fragmented and stored on your drive in no particular order. This means that your computer takes longer to find and load the files you need, when you boot your computer and start applications. You'll soon find your system seems to be running even slower than before. One solution is to defragment your drive, which means that the files are stored in an ordered manner, meaning they are located more quickly.
O&O Defrag Pro 10.0.1634 is a commercial disk defragmentation tool that's been around for a while and recently updated to support Windows Vista. It will reside in the background, defragmenting your drive as you use your computer, but without affecting your work. Other rival products include Paragon Total Defrag 2007, which was recently updated.
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