Changing w2k partition to A6

[Rob Sessink <rob_ses_(_at_)_web_(_dot_)_de>]

My box its configured to have on the first partition W2k and on the 
second partition OBSD. Now i want to get rid of the w2k to make it an 
A6 obsd partition. After setting the partition type to A6 with fdisk, 
obsd panics and i am unable to boot obsd.  I have set the partition 
type back to w2k type and i can boot obsd again. 

How can i change and add this partition to obsd. Should i just change 
the disklabel and make a ffs filesystem on it with ffs? 
In the mbr disktabel the partition type would then not be set to A6, does 
this matter for normal use ?

Here's my partition tabel

Disk: wd0       geometry: 786/128/63 [6338304 sectors]
Offset: 0       Signatures: 0xAA55,0xDAD9DAD9
         Starting        Ending
 #: id  cyl  hd sec -   cyl  hd sec [     start -       size]
-----------------------------------------------------
*0: 07    0   1   1 -   380 127  63 [        63 -    3072321] HPFS/QNX/AUX
 1: A6  381   0   1 -   785 127  63 [   3072384 -    3265920] OpenBSD
 2: 00    0   0   1 -     0   0   0 [         0 -          0] unused
 3: 00    0   0   1 -     0   0   0 [         0 -          0] unused