[Bug 288608] Undocumented gpart supported partition type openbsd-data

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 02 Aug 2025 18:44:03 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288608

            Bug ID: 288608
           Summary: Undocumented gpart supported partition type
                    openbsd-data
           Product: Documentation
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Manual Pages
          Assignee: bugs@FreeBSD.org
          Reporter: jiangjun12321@gmail.com
                CC: doc@FreeBSD.org

In gpart(8) manual page PARTITION TYPES section, openbsd-data is not listed as
currently understood and used by FreeBSD. However I found that `gpart create -t
openbsd-data` actaully worked when I tried, which was also mentioned a lot if
you search on Google, at least under a GPT scheme. I did not test MBR though.
Partitions created by using `-t openbsd-data` would get picked up by OpenBSD
installer and fdisk as type `OpenBSD` and could be utilized by installer for
system install. I am not sure if there are any other partition types omitted in
the manual page. Or is this an obsolete behavior that got removed in manual
page but not in actual code and thus not really supported feature?

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