Re: Hotfix 920958 damages especially archives and photos

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Mark V wrote:
In microsoft.public.win2000.file_system wrote:

It seems as if only non-compressible files with a (filesize
modulo 4096) of about 3600 to 4095 became victims of the fatal
bug. The list of my damaged files contains mostly JPG-Files and
archives. In detail one 7z-files, eight exe-files (packed?), one
bz2-file, five gz-files, one tif-file, 116 .jpg-files and nine
zip-files were partially overwritten with the ßßßßßßß-sequence.

In my testing here I found no existing (pre-KB920958) files
suffered corruption within +C directories. Setting -C succeeded in
decompressing all those files without damaging any.

I tested with a thousand random GIF and JPG files copying them into
a test directory set +C. Approximately 12% became corrupted. ALL
of the files damaged were in a range of
<even cluster value here>.89
to
<even cluster value here>.99
(W2K NTFS default - 4096 bytes)

I cannot believe that the "raw" file on the disk is unharmed, as

Neither can I (for new files).

stated by the microsoft employee above, for even Ubuntu Linux,
when bootet from CD at the same machine, read the same garbage
out of the files as Windows 2000 either with the patch
deinstalled or installed.

I suspect the files are corrupted (post KB920958) when copied into
a +C location. End of story after that.

I have a compressed, corrupted binary file that is damaged on disk but is
OK in a backup (which is also compressed via NTFS). After removing KB920958
the original is still damaged if read as compressed or decompressed;
confirming that the raw data is indeed damaged.

Cheers,

Adam Piggott, Proprietor, Proactive Services (Computing).
http://www.proactiveservices.co.uk/

Please replace dot invalid with dot uk to email me.
Apply personally for PGP public key.
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