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Full user review
"SD2 - The only free defragger with defrag at boot-time"
2. Boot-Time Defrag of all selected drives
3. Automatic Defrag of all selected drives
4. Scheduled Defrag/Optimazation of all selected drives
5. Higher Speed than previous version
6. Customizable Defrag/Optimazaion window
1. Full Optimazation is still time-consuming
For the moment SD2 is the only free defragmenter, that defrags at Boot-Time. O&O Defrag and PerfectDisk are doing Boot-Time defrag but are expensive sharewares. Boot-Time defragmentation is essential for system files in use eg. Pagefiles, MFT, and Hibernation File.