A defrag solution by Maryland, US based developer Raxco Software. This program is available for a thirty day free trial, after which you can choose to purchase the software for $29.99 which allows installation on three different computers.
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Been using since W2K days - love the options for scheduling and how you want your drives defragged.
Pro Intelligent disk optimization
The program utilizes a proprietary strategy called SMARTPlacement optimization which orients drive optimization around the habits of the user.
Pro Spacial integrity
PerfectDisk offers a unique approach to space management in that it actively recovers disk space by checking for file duplicates and eliminating them.
Pro OptiWrite transparent & zero-peformance-impact fragmentation prevention
Prevents most (though not 100%) file fragmentation after a drive has been full defragmented
Con High price point
The price could very easily put one off. Unlike many other products, PerfectDisk has no free features beyond the thirty day trial. Furthermore, the only way to guarantee unlimited utility past three computers is to purchase a total home license which costs $49.99.