High disk usage refers to a process that forces the hard disk to perform heavy operations that will slow the performance of other applications currently running. Usually, there are two types of usage situations:
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You are currently doing an operation that requires heavy disk usage, therefore you will see hard disk activity to be very high in the Task Manager.
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The application is not correctly developed/optimized to work nice with the system where it's installed.
Try contacting the developer of the application and report this issue to him.