Weird access deniel problems to a non system disk

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Using Windows 2000 Pro + SP4.
I have a bootable system HD (C:) and a data HD (D:).
Drive C: has programs only and drive D: data only.
All of a sudden, I have access problems to certain folders
on drive D:.
I know for sure that it has nothing to do with the programs
on drive C: because I have back drives that are a clone of
drive C:, have been created well before the problem on D:
occured and when I try using those backup system drives
I see the same phenomena. Here are the symptoms:

Windows Explorer can access the root and many folders
but for certain folders, I have to wait very long to open the
folder in the Folder pane (when clicking the + sign) and as
keep going down the tree I finaly hit hit a folder for which
after some lenghty wait it respond:
"Path xxx is not accessible.
Error performing in page operation."

When trying to run Chkdsk D: I get immediately the response:
"Access denied" w/o out it even progress anywhere. This is
in spite Windows Explorer does not have access problem
to that drive in general.!

When trying to select a drive in the Explorer's folder pane,
then Properties->Tools->Error Checking, I get immediately,
seemingly w/o even progressing a bit the response:
"Windows was unable to complete the disk check".

Given that madness that went into drive D:, I don't know even
where/how to start analyzing the problem.

Does anybody know a decent and reliable tool that can tell
what is the problem, that instead of responding with such
infamous idiotic messages such "Access denied", it will tell
WHY is the access denied, or the "...inpage operation"
mentioned above, etc., that tells me nothing and possibly
even help to fix the problem, or at least help salvage folders
which are still reliably accessible?

Many thanks in advance,
David


.

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