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Number   :  63
Date     :  2001-05-17
Author   :  Jim Witherspoon
Subject  :  Re: xxcopy switches, etc.
Size(KB) :  1


I'm a bit puzzled by the example below. My understanding is that if a file
is given a name that complies with the SFN requirements (all uppercase, fits
within 8.3 scheme), there is no LFN at all, but just an SFN. If this is
true, the source SFN-only files will simply overwrite the SFN-only files
with the same name, and they destination files will still have only SFNs.

The directory entry for the SFN contains the file attributes, the starting
cluster number. LFNs are put into separate 32-byte directory entries, and
each entry contains up to 13 characters of the LFN. In the case of the
SFN-only file, there is only a single directory entry (the SFN entry), with
no associated directory entries containing parts of an LFN.

Then again, I could be wrong!

jim

> Dear Ken, Thanks for the very thorough reply. I wish to zoom in on
> one of your examples.
>
> > Here's another case
> Before the copy (XXCOPY \SRC \DST)
>
> Source Destination
> -----------------------------------------------------------
> LFN (SFN) LFN (SFN)
> MYLONG~1 (MYLONG~1) MYLONG~1 (MYLONG~1)
> MYLONG~2 (MYLONG~2) MYLONG~2 (MYLONG~2)
>
> After the copy
>
> Source Destination
> -----------------------------------------------------------
> LFN (SFN) LFN (SFN)
> MYLONG~1 (MYLONG~1) MYLONG~1 (MYLONG~1)
> MYLONG~2 (MYLONG~2) MYLONG~2 (MYLONG~2)
>
> These are the result whether you use the /NX0 or not. <
>
> You are making the assumption that the files in a directory are
> copied in alphabetical order on LFN. Is this correct? It would be
> great if so, and would be the end of my worries here.
>
> Otherwise, what can happen is a file MYLONG~2 (MYLONG~2) gets copied
> first and becomes MYLONG~2 (MYLONG~1). What would then happen to
> the following MYLONG~1 as it tries to copy the files in "file number"
> order, if for some reason the MYLONG~2 has a lower file number?



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