Anyone use gpt?

[Jerry LeVan]

Hi,

I have a largish firewire disk that I use for backing up various
drives in two of my mac osx computers.

I have about 120GB of free space left on the firewire drive and
I would like to setup about half of the free space for general
(upbacked up ) storage...

Disk utility seems to want to re-init the entire drive if I try
to add a partition.

I apropos'ed partition and found the program "gpt".

The man page asserts that one can use gpt to "add" a partition.

The command gpt show displays:

[mbp:~]$ gpt show disk2
       start       size  index  contents
           0          1         PMBR
           1          1         Pri GPT header
           2         32         Pri GPT table
          34          6
          40     409600      1  GPT part - C12A7328-F81F-11D2- 
BA4B-00A0C93EC93B
      409640  243669008      2  GPT part - 48465300-0000-11AA- 
AA11-00306543ECAC
   244078648     262144
   244340792  124326424      3  GPT part - 48465300-0000-11AA- 
AA11-00306543ECAC
   368667216     262144
   368929360  359339512      4  GPT part - 48465300-0000-11AA- 
AA11-00306543ECAC
   728268872  248504263
   976773135         32         Sec GPT table
   976773167          1         Sec GPT header

Tain't clear what the two 262144 sized unlabeled areas are, I am  
guessing maybe
the journal file. (But get info says that all three of the partitions 
( index 2,3,4)
are journaled...

Has anyone actually used this program to "add" a new partition?

Thanks

Jerry