Partitions are logical subsections of a hard drive. OpenBSD can handle different partitions with their own unique privileges. You might make some partitions read-only so that files on them cannot be added, moved, or changed.
OpenBSD might refuse to run programs on a specified partition, and it knows that device nodes should appear only on certain partitions. User files should not have
setgid permissions, so the operating system won’t recognize those privileges on files on the user data partition. While many operating systems support these sorts of privilege controls, OpenBSD uses them by default.
The most difficult part of installing OpenBSD is partitioning. When you don’t know how partitions work, choosing partitioning ...