Perfect, thanks a lot. It worked like a charm.

> On 9 Dec 2022, at 17:23, Crystal Kolipe <kolip...@exoticsilicon.com> wrote:
> 
> On Fri, Dec 09, 2022 at 04:19:49PM +0000, James Johnson wrote:
>> Hi all,
>> 
>> I have installed an internal hard drive of 4TB. This drive will be used for 
>> storing data only. It will not contain the OpenBSD system itself.
>> 
>> Knowing the limitations of MBR, I have opted for a GPT partitioning system : 
>> fdisk -A sd0
> 
> If the disk is to be used exclusively with OpenBSD, you can use an MBR 
> partitioning system, even though it's 4 TB.
> 
>> Following this, I am trying to add the partition with disklabel.
>> 
>> I have created the a partition, of 2TB (the size suggested by the system).
>> Then I try to add another partition, but disklabel tells me I have no space 
>> remaining.
>> 
>> I am stuck. The only option that seems relevant in the man page is to modify 
>> the boundary with the -b option. I am scared to do so without specific 
>> advice though, as it could corrupt the OS if done improperly, from what the 
>> manual says.
>> 
>> I just want to be able to use the full size of the disk. Ideally, I would 
>> like a single 4TB partition, but if not possible, I am fine with 2 
>> partitions of 2TB.
>> 
>> Any recommendation?
> 
> For use with OpenBSD only, create a single MBR partition covering as much of 
> the disk as is possible with MBR, something like:
> 
> Disk: sd1     geometry: 267349/255/63 [4294961685 Sectors]
> Offset: 0     Signature: 0xAA55
>            Starting         Ending         LBA Info:
> #: id      C   H   S -      C   H   S [       start:        size ]
> -------------------------------------------------------------------------------
> 0: 00      0   0   0 -      0   0   0 [           0:           0 ] unused     
>  
> 1: 00      0   0   0 -      0   0   0 [           0:           0 ] unused     
>  
> 2: 00      0   0   0 -      0   0   0 [           0:           0 ] unused     
>  
> *3: A6      0   1   2 - 267348 254  63 [          64:  4294961621 ] OpenBSD   
>   
> 
> Then invoke disklabel -E, and adjust the bounds to fill the whole disk with 
> the b option, giving * as the size.
> 
> Finally, add a single large partition covering the whole disk in the normal 
> way.

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