[sizeI've used this utility but twice: on my Thinkpad T60p and T500, both with Windows 7 ProfessionNEL ?Can. Fr. OS/S?'s?. It's far slower than others and needs 2+ passes to deal with the 320 GB HD's. I DID a full disc+reg. cleanout first. - What I find most irksome compared to others is that it displays in several colors during the process, yet there's no legend to signal what the colors indicate. All other defragers, except the W7 default have legends, why this glarng over-sight?