Is this disc a HDD ?
Is it a secondary Internal or an external disc ?
Assuming that you burnt a Boot CD with 'Dariks Boot And Nuke' and booted into that,
then in theory it should not be able to leave 20 files intact.
Is it possible that the disc was perfectly erased,
BUT afterwards these 20 files were created during the "normal chaos" of a Windows 2000 boot-up/start-up/log-in process ?
N.B.
Windows XP onwards,
and very probably Windows 2000,
cannot live without creating a Recycle Bin on every partition it can lay its hands on
Using TreeSize Free I can observe that my secondary HDD partition D:\ holds
D:\$RECYCLE.BIN\S-1-5-21-4077350907-178761674-415728870-1000\Desktop.ini
D:\$RECYCLE.BIN\S-1-5-21-4077350907-178761674-415728870-1001\Desktop.ini
I observe that when I right click and select properties on each of these Desktop.ini files,
they are shown as zero bytes "created 10 March 2012, 09:28:38",
and VERY surprised to observe that they have the status
Deleted 23 October 2012, 08:42:59.
I deduce they were created when Windows was first installed and saw these partitions,
and every morning at start-up the old one is deleted / recreated and the newly created one is so inaccessible that even TressSize cannot see it until its "protection" is removed on the following start-up.
Windows is an enigma, wrapped up in a puzzle, wrapped up in a conundrum.