Posted 25 December 2008 - 07:55 PM
Well...it defrags the Master File Table, along with other system files which the XP defrag tool does not defrag. This is the offline defrag of system files which PD does on the next boot.
What version of Perfect Disk are you using...I have 8.0 installed and it doesn't seem to have the option you mention, although I believe an earlier version phrased it that way.
In any case, the defrag operation is one where files are moved because the system functions better when file components are together.
Defragging won't solve the problem that you seem to have...from what I understand.
I can't tell you anything about Vista, since I haven't installed it.
The most generic advice I can give you is...if you have an XP CD, try running chkdsk /r from the Recovery Console on either partition you have problems with.