How to safely merge two slices on harddisk?

[Rob]

Jerry McAllister wrote:
>>
> 
> In any case, do not use /stand/sysinstall for this.   You need more direct 
> control and should use disklabel directly.   As mentioned in my previous 
> posting use the command  
>                          'disklabel -e -r asd1s1'  
> and then edit the tmp file 

Malcolm Kay wrote:
 >
 > A good chance it will work -- but pre-existing 'f' and 'g' data is lost.


Thank you guys for your help.
I actually did use sysinstall (sorry, Jerry) and mission is accomplished.
Yes, indeed, I lost the data is the two merged partitions 'f' and 'g', but
that was no problem; I needed to keep the data in all other partitions.
Sysinstall did all that for me.

Meanwhile I learned a lot more about disklabel, thanks to your comments.
Great and many thanks,
Rob.