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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Pro Intelligent disk optimization
The program utilizes a proprietary strategy called SMARTPlacement optimization which orients drive optimization around the habits of the user.
Pro OptiWrite transparent & zero-peformance-impact fragmentation prevention
Prevents most (though not 100%) file fragmentation after a drive has been full defragmented
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.
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.