5.4-release + 6.0-current on the same disk

hi there,

i wish to install 5.4-p? and 6.0-current (to be release) on the same disk of 
a single
machine for to test the 6-0-current.

however, the disklabel of the recent 6.0-current resist to co-operate with 
that of
the 5.4-p?.  i.e. when i have installed 5.4-p?, and then 6.0-current, 
disklabel information
would be lost.

i had "cd /usr/src/release; make release ........" to produce both install 
and boot
CDs for 6-0-current of i386 and amd64 and tried installing for co-existence 
of the
5.4-release partitions, in vain:  everytime i install the 6.0-current, the 
disklabel
on the 5.4-p? were erased.

should any kind folks please indicate the way to make them co-exist on the 
same machine?

best regards,

clarence chu

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