Previously on microsoft.public.windows.vista.file_management,
frankfleck said:

I have vista home premium, 200gb hard drive. i had not been paying
attention until I received a warning that I was running out of space.
Being sort of a dummy, I took computer to Best Buy. They ran
diagnostics. They found no problems. Then they cleaned it up and
optimized it. When I got it home the C drive showed 177gb capacity with
135gb free space. Within 3 days my free space was reduced by approx
25gb. I downloaded and ran Auslogics Defrag and my free space was again
135gb. But in the last 5 days my free space has been disappearing. It's
at 113gb right now. I realize that's plenty of free space, but I'd like
to rectify this problem before I'm close to showing full again. Can
someone help me?

In addition to what RC wrote, it may also be a sign that the drive or
controller is going bad.

If the computer is detecting, rightly or wrongly, that sectors of the
drive are bad, the system will mark them as unusable and shrink the
available space accordingly.

If diagnostics were run specifically to check for this and found
nothing, then either nothing is wrong or it's wrong in such a way that
systemically probing each sector fails to find the problem. That is
possible, that has happened to me once, on a Win2K computer.

--
Jeffrey Kaplan www.gordol.org
Double ROT13 encoded for your protection

"Our lives begin to end the day we become silent about things that
matter." - Reverend Martin Luther King Jr.