Title : Create a new OpenBSD partition from unused space Author: Solène Date : 20 September 2018 Tags : openbsd68 openbsd highlight The default OpenBSD partition layout uses a pre-defined template. If you have a disk more than 356 GB you will have unused space with the default layout (346 GB before 6.4). It's possible to create a new partition to use that space if you did not modify the default layout at installation. You only need to start **disklabel** with flag *-E** and type **a** to add a partition, default will use all remaining space for the partition. # disklabel -E sd0 Label editor (enter '?' for help at any prompt) > a partition: [m] offset:  size:  FS type: [4.2BSD] > w > q No label changes. The new partition here is **m**. We can format it with: # newfs /dev/rsd0m Then, you should add it to your **/etc/fstab**, for that, use the same uuid as for other partitions, it would look something like 52fdd1ce48744600 52fdd1ce48744600.e /data ffs rw,nodev,nosuid 1 2 It will be auto mounted at boot, you only need to create the folder /data. Now you can do # mkdir /data # mount /data and **/data** is usable right now. You can read [disklabel(8)](https://man.openbsd.org/disklabel.8) and [newfs](https://man.openbsd.org/newfs.8) for more informations.