modify existing partitions - newbie

[Jerry McAllister]

> 
> Hai,
> 
> I just needed to delete some partitions(ad0s1e &
> ad0s1f) in my existing slice(ad0s1) and recreate with
> some changes. 
> 
> 1) I tried using 'sysinstll --> Config --> Label' ,
> then delete e & f , but this couldn't write. It says
> 'unable to write data on ad0' . What is the problem?
> 
> 2) Tried using 'disklabel -e ad0s1', then a file
> opens. I deleted the last two lines(e & f) and saved. 
> Now it shows as the following 
> 
> # /dev/ad0s1:
> 8 partitions:
> #        size   offset    fstype   [fsize bsize
> bps/cpg]
>   a: 41943040        0    4.2BSD     2048 16384 28552
>   b:  4194304 83886080      swap
>   c: 320159322        0    unused        0     0      
>   # "raw" part, don't edit
>   d: 41943040 41943040    4.2BSD     2048 16384 28552
> 
> Is it the correct way to delete the partitions?

First guess is not having permission.   
It should be done in single user mode.

Second guess is the partition you want to delete is mounted.

I have never tried to modify partitions on the disk with root on it, 
so maybe that presents special problems.   You may need to boot
from something else - live CD for example.

////jerry

> 
> 3) How to add new partitions in the same slice?
> 
> ( I read lot of links, all are about formatting a new
> slice) 
> 
> 
> Please help me
> 
> Sarav
> 
> 
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