I have 2 X 6.4 gig hard drives on my system. My 'C' drive defrags fine with the option of 'make programs run faster'<br>but when trying to run defrag on my 'd' drive it comes up with the message telling me to run Scandisk. I run a thorough session of scan disk then try defrag again and again I get the failure.<br>I have managed to run defrag with the 'make programs run faster' option turned off and its fine but with the other option it gets to 10% then highlights the first line then comes up with the error.<br>Has anyone any clues about this one?