This is the software publisher’s description.

Popular and thorough disk defragmentation solution that combines speed, thoroughness flexibility, control and ease-of-use to help improve PC and server performance. Global enterprises benefit from faster computers through regular, automated, unattended defragmentation with PerfectDisk. Certified by Microsoft for Windows, PerfectDisk is designed for today's largest disk drives. With PerfectDisk's Command Center management console, complete management and control is at the administrator's fingertips.

Built for the largest and most fragmented disk drives, PerfectDisk provides the most comprehensive solution for defragmentation by optimizing virtually every file on the system, including all metadata, paging files, and directories. PerfectDisk's patented SMART Placement technology optimizes drives to speed defragmentation runs and minimize resource usage. Space Restoration Technology ensures free space is consolidated more than any other defragmenter on the market. PerfectDisk's patent-pending Resource Saver technnology further speeds defragmentation times. And it can all be automated easily with PerfectDisk's AutoPilot Scheduling. All in a single pass, not with outdated multipass technology -- once and done.

The new 2008 edition contains a brand new user interface, stealth defragmentation and much more.