Hi Mikael,

Mikael wrote on Mon, Oct 05, 2015 at 01:44:36PM +0800:

> Hi,
> 
> Where can I see a complete list of disklabel fs types?

https://en.wikipedia.org/wiki/Partition_type

But note that such a list can never be authoritative, never complete,
and by definition of the concept, almost all of it is irrelevant
for no matter which task.

It may seem highly unusual that *I* am sending people to the
web for documentation.  However, there is a reason in this
particular case.

> It must be documented somewhere,

No, there is no need to.

 1) It is in no way related to OpenBSD.  So why should OpenBSD
    document it?  All that is relevant to OpenBSD is A6, and
    that is documented in fdisk(8), where it belongs.

 2) We do want our documentation to be correct and complete,
    but we also want it to be concise, so we don't include
    irrelevant information.

 3) OpenBSD does support multibooting, though we clearly
    discourage it for most use cases.  So you may have a need
    to know another partition type ID.  But that's a property
    of your *other* system, so you should look it up in the
    documentation of your other system.

> but I can't find it neither in the
> "disklabel" tool itself, nor in its man pages.

It has nothing to do with disklabel(8), it's a property of the
machine-dependent so called "master boot record".

> In disklabel's "a" command,

I guess you are talking about fdisk(8) -e.

> typing "?" is interpreted as invalid input, and
> typing "help" is interpreted as choosing the fs type "unknown".

I don't know which version of OpenBSD or which snapshot you
are using, and right now, i don't have the time or hardware
to figure out whether there was or is a bug of that kind.
Maybe someone else can answer this part.

Yours,
  Ingo

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