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Number   :  2604
Date     :  2002-08-04
Author   :  Kan Yabumoto
Subject  :  Re: Sames files re-copied with /BU ?
Size(KB) :  1



Add the /FF switch which fudges the file-time comparison
with a +/- 2 second slack. The culprit was the fact
your C: drive is probably in the NTFS format (or
many of the file came from a Unix environment where
the timestamp was originally set to 1-second interval)
whereas the file system for your CD/RW volume is probably
a DOS-compatible 2-second granularity. This guess
is based on your observation that the repeated
incremental backup matches about 50% of the files
(1-second granularity vs 2-second granularity). If the
file set were mostly created in an NTFS environment,
the much-finer granularity would result in 99% time-
mismatch.

At any rate, your problem will go away with the /FF switch.

Kan Yabumoto
========================================================

At 2002-08-04 14:31, you wrote:
>Hello - I'm using the following line in a batch file to copy from my
>C: drive (under Windows 2000) to my CD/RW (DirectCD 3.01):
>
>XXCOPY C:\_Projects\CCT\ E:\CCT\ /BU /FOE:\BkupLog.txt
>
>The intial copy worked fine, but I ran the batch file again,
>immediately, thinking it would not copy any files (no changes in
>source folder), and it copies about half the files again.
>
>What am I doing wrong?
>
>Thanks (especially if this is a frequent question)
>
>Mark



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