Last slice lost

Hi,
I have found this note in dar 2.4.0 release notes:

* an isolated catalogue can now be used as backup of the original
archive's internal catalogue (-A option in conjunction with -x option
for example)

Can anybody explain what does it mean to me? Does it mean I no longer need the last slice when restoring content of another slice?

I have tried (ubuntu 10.10, dar 2.4.1 installed through ppa:polslinux/polmaver) but dar still requires the last slice at first:
dar -x archive -A CAT_archive -g sample
seems to be same as
dar -x archive -g sample

Or is there any other way to restore content (using isolated catalogue) when the last slice is totally lost?

Thank you,
xandre

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