How to set up a data disk of 4TB?

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

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?

Thanks!