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Date:      Mon, 13 Jan 2014 22:05:23 -0600
From:      Mark Felder <feld@FreeBSD.org>
To:        Marcel Moolenaar <marcel@xcllnt.net>
Cc:        freebsd-geom@freebsd.org
Subject:   Re: "deep" gpart backup?
Message-ID:  <E13DF77A-C05A-4257-857E-DE28AB230382@FreeBSD.org>
In-Reply-To: <4C2C8202-D6B7-4E3A-BE6C-26D362300A2E@xcllnt.net>
References:  <1023566295.20140105015301@serebryakov.spb.ru> <1389461267.16576.69479689.0A3D893A@webmail.messagingengine.com> <F0F3FBB0-348F-4F20-AE06-449A9A7B7E5E@xcllnt.net> <FC3C2BBA-9268-421D-8F28-B9E034A7010B@FreeBSD.org> <EA1339E1-B1D7-464B-B0EF-C3E6C53DA47C@xcllnt.net> <07F2E9B0-F695-4A1D-B046-C902F0ED1A0E@FreeBSD.org> <4C2C8202-D6B7-4E3A-BE6C-26D362300A2E@xcllnt.net>

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On Jan 13, 2014, at 21:42, Marcel Moolenaar <marcel@xcllnt.net> wrote:

>=20
> On Jan 13, 2014, at 7:36 PM, Mark Felder <feld@FreeBSD.org> wrote:
>=20
>>=20
>> On Jan 13, 2014, at 21:34, Marcel Moolenaar <marcel@xcllnt.net> =
wrote:
>>=20
>>> Uh, ok. No alias know. Raw value it is...
>>>=20
>>> 	ns1% sudo gpart add -t \!0xa9 -s 1023 md0
>>> 	md0s1 added
>>> 	ns1% gpart show md0
>>> 	=3D>   1  2047  md0  MBR  (1.0M)
>>> 	     1  1023    1  !169  (512K)
>>> 	  1024  1024       - free -  (512K)
>>=20
>> Yay! Can you slip that into the man page? That would be great :-)
>=20
> Ok, I need your help. The manpage does mention it, so it's
> probably not too clear. This is what the manpage says:
>=20
> 	:
>=20
> PARTITION TYPES
>     Partition types are identified on disk by particular strings or =
magic
>     values.  The gpart utility uses symbolic names for common =
partition types
>     so the user does not need to know these values or other details of =
the
>     partitioning scheme in question.  The gpart utility also allows =
the user
>     to specify scheme-specific partition types for partition types =
that do
>     not have symbolic names.  Symbolic names currently understood are:
>=20
> 	:
>=20
>     freebsd          A FreeBSD partition subdivided into filesystems =
with a
>                      BSD disklabel.  This is a legacy partition type =
and
>                      should not be used for the APM or GPT schemes.  =
The
>                      scheme-specific types are "!165" for MBR, =
"!FreeBSD" for
>                      APM, and "!516e7cb4-6ecf-11d6-8ff8-00022d09712b" =
for
>                      GPT.
>=20
> 	:
>=20

I have misread this specific sentence several times over the last few =
years:

"The gpart utility also allows the user to specify scheme-specific =
partition=20
types for partition types that do not have symbolic names"

I guess it doesn't help that I've always known it as an ID not a =
"partition type". Even the Wikipedia article for "Partition types" calls =
them IDs. I thought the mention of the values "!165" etc were simply =
confirming what values gpart was using internally in relation to those =
symbolic names.

I'm very pleased to know this is possible now. :-)

> Does it help if we add an example?


It's possible that I'm in the minority here, but an example would make =
it clear.


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