Why are double undo.Z files no hard links to save diskspace?

Hi,
many undo.Z under /var/sadm/pkg files exist twice:
<pkg>/save/<patch id>/undo.Z and
<pkg>/save/pspool/<pkg>/save/<patch id>/undo.Z
Why are these files not hard linked? Is there a technical reason for that?
It would be nice to save some space in /var/sadm/pkg ...
Thanks.

Good to know why undo.Z can't be hard linked. Thank you!
If diskspace is an issue, you might find this document useful:
http://sunsolve.sun.com/search/document.do?assetkey=1-9-14295-1
Sorry, have no service plan, don't ask why, i'm private.
Yes i have diskspace problems, /var slice was configured too small (1GB).
First i tried moving /var/sadm/pkg to a larger slice, made pkg a symlink.
That does not work, SUM means no patches have been installed.
Second try was to move completly /var/sadm to a larger slice.
This seems to work good with SUM.
But today i was wondering about that someone changed the symlink /var/sadm back
to a new directory and put only 'smc/...' into it.
Now i know who it was: i run 'smosservice add' to prepare a diskless client.
sadm/smc/smcreg was modified on the symlinked tree, after that /var/sadm was
switched back to a new directory. This makes /var/sadm completly useless,
e.g.: 'showrev -p' answers with 'opendir' :-)
Ok, if i changed something i should not think all will work, so i think about a new
installation with much more space for /var.

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garywicke wrote:
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*************** NEWS FLASH ******************
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