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Perform defragmentation of your hard drive to free up space.
Defrag the memory of your computer.
Defragment your drive while you work.
Defragment your hard drive now or by schedule.
Defrag your system registry for faster performance.
Defragment and optimize your hard drive.
Keep your registry as compact as possible and improve your computer performance.
Defragment your hard disk to accelerate PC performance.
Defrag and optimize hard disk to enhance disk durability and maximize PC performance.
Select and defrag files on your hard disk.
iDefrag is a small utility with the single purpose of running drive defragmentation and optimization. It does this job quite well, and has become a reputable and complete option for people wanting to defragment and optimize their hard drives.
Improve the performance of XP and Vista--at least a little bit--by running its built-in disk defragmenter with your choice of command switches.
Does Mac OS X need a disk defragmenter/optimizer?
Odds and Ends: Defragmentation? New HP 24xx drivers
Executive Software announced that Microsoft has agreed to include a manual version of Executive Diskeeper defragmenter in the Microsoft Windows NT 5.0 operating system. Periodic defragmentation of disks in certain circumstances maximize system performance, according to the company. Suggested retail prices are $75 for Diskeeper for Windows NT Workstation and $399 for Diskeeper for Windows NT Server. Available platforms include Intel and Alpha. There are no client-access charges.