What You See What You Get

Diskeeper 2009 Pro Premier provides unparalleled peak performance for workstations with high performance demands. Pro Premier now takes on rapidly increasing hard drive capacity and volume sizes effortlessly with a powerful defrag engine designed specifically for big defrag jobs.
Diskeeper is the only defragmenter that allows to defragment your system as fragmentation occurs, even during heavy traffic times – without using active system resources.

Requirements :
The disk space requirements for Diskeeper depend on several factors. On Windows Vista, XP and Windows 2000 systems, Diskeeper will need about 11 MB. Allow about 10 MB of extra free space for temporary files during the installation.