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Number   :  4735
Date     :  2003-06-03
Author   :  Kan Yabumoto
Subject  :  Re: Re. : incremental Backup & Re: Copying to CD-R
Size(KB) :  3


 > 3. ***I suppose I have to be contended with /backup
> version of the command, as I am planning to copy
> into CD-R s. ? ****

XXCopy currently does not support any non-standard
storage device. That is your CD-R volume is read-only
media (once it is written by other tools and the session
properly completed for access) as far as XXCopy is
concerned. In order for XXCopy to write files on a
CD-R, you must install a device driver which is capable
of "packet writing" ---- Ahead's InCD (my favorite),
Roxio's DirectCD, or Veritas's DLA (DriveLetterAccess)
are well known product in the category.

>3. Now some further questions
>----------------------------------
>- My "source" consists of bmp, jpg etc files and so would
>extend to some 7 -> 8 CDs (approx 5+ GB). There may be
>changes to directories / sub directories between successive
>backups. Will XXcopy handle this [during the first back up
>and during successive backups] or should I manually handle
>this (i.e.) creating and selecting subdirectories of < 700
>MB size

Currently, XXCOPY does not have a mechanism to
automatically split a relatively large set of
source files into a multiple subdirectories
which are divided by some quota (say, in this case,
by the total byte count). It would be nice to
be able to create a series of destination directories
which would be good as a staging are for CD-R buring
(or better yet, to let XXCopy to write directly to
CD-R without the help of Packet-Writing tools ---
but currently it is beyond the scope of what XXCOPY
is designed for).

So, an alternative may be to write a batch file
with a loop construct and each invocation of XXCOPY
within the loop has the /QBL switch.

prep_cdr.bat
----------------------------------------------------
xxcopy \src\ /s/aa // tag the A-bit
set xxcount=0
:loop
set /a xxcount+=1
xxcopy \src\ \dst\part_%xxcount%\ /M/QBL:640M
if not errorlevel 1 goto loop
if errorlevel 101 goto loop
if errorlevel 46 if not errorlevel 47 goto loop
:done
----------------------------------------------------

The above command will produce destination
directories like:

\dst\part_1\
\dst\part_2\
\dst\part_3\
...

Note: it is your own responsibility to modify this
to add usual switches like /S, /H and /KS, etc.
Keeping the focus on illustrating the particular
technique, I usually omit such switches
in my samples deliberately.

Note: The /Qxx (Quit on Quota) switches should give
give the exit code value of 46 (conditional
termination) when it triggers the quit action.
However, due to a bug, it returns 0 (the last
"IF" statement above will be needed when the
bug is removed eventually).

I'm not expert on batch files. I'm not sure which
versions of Windows support the "SET /A" feature.

> Roxio direct CD - How should this be used in
> combination with XXcopy ? any tips ?

Yes. It's simpler if you use DirectCD. In that
case, you need not create the staging area on the
hard disk. You may simply use the /SP switch
which allows XXCOPY to prompt for a new CD-RW
when it becomes full. This is because DirectCD
is a tool which transforms the CD-RW drive (with
an appropriate formatting procedure) to behave
like an ordinary hard disk --- XXCopy can directly
write to the volume.

But, wait, you said you were talking about CD-R,
not CD-RW which I don't believe you can use DirectCD.
(In this context, you just cannot mix CD-R and CD-RW
in your text because it is quite relevant here.)

Kan Yabumoto



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