Here is it, publisher description abour Diskeeper 2008

Diskeeper 2008 introduces the most powerful defragmentation engines ever developed. Even on systems with as little as 1% free space available, Diskeeper restores performance and reliability. Diskeeper 2008 is completely transparent and runs in real time. It taps into unused idle resources with a breakthrough background processing technology called, InvisiTasking. This means no performance lapse is ever caused by fragmentation related build-up; giving the user maximum speed and reliability at all times. See for yourself. Version 2008 may include unspecified updates, enhancements, or bug fixes. Try it, because it's good.
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Boots Up your Computer Performance!