how install two freebsd9.2 on one disk?

saeedeh motlagh saeedeh.motlagh at
Mon Nov 18 11:52:29 UTC 2013

thanks all for your answers.

i wanna install two OSes on gpt partitions - both of them use gpt
partitions-. if i understand correctly, there is no boot manager for gpt
partitions. you know, i need a boot manager which shows something like F1
freebsd F2 freebsd.
maybe grub can help but i don't want to use it. so there is no else option
for me right?

is it possible to change one freebsd OS from gpt to mbr in order to use
boot manager while the other one is gpt? i think it is impossible because
just one scheme can be defined for disk which is gpt or mbr. please let me
know if i am wrong and there is any way to do it.
thank you

On Mon, Nov 18, 2013 at 1:29 AM, Warren Block <wblock at> wrote:

> On Sun, 17 Nov 2013, Polytropon wrote:
>  On Sun, 17 Nov 2013 09:09:23 -0700 (MST), Warren Block wrote:
>>> On Sun, 17 Nov 2013, Polytropon wrote:
>>>  On Sun, 17 Nov 2013 16:51:42 +0330, saeedeh motlagh wrote:
>>>>> (although i do it and nothing change) if not, where is boot manager
>>>>> and how
>>>>> should i use it? i think something should be done about boot partition
>>>>> (ada0p1), don't it? please help me to boot my 2 OS correctly.
>>> This is a good question.  As far as I know, boot0 will only work on real
>>> MBR disks, and does not understand GPT partitions.  Any time I've needed
>>> to multiboot, the other operating system can't handle GPT anyway, so MBR
>>> is required.
>> It's just the question in how far gpart can be used to create
>> such an MBR layout, or if traditional tools (fdisk, bsdlabel,
>> newfs) will be easier here?
> I was talking about the MBR partitioning scheme versus GPT.  gpart can
> create both, and of course newfs must be used regardless.  The concern is
> whether boot0 can recognize GPT partitions.  Probably not, but I have not
> tried it.
>  Another option for GPT is to use the bootme and bootonce flags.  See
>>> gptboot(8).
>> Those are also mentioned in "man gpart", which I was already
>> thinking of (in terms of being a part of the solution).
> Some of the description of them in gpart was moved to the new gptboot man
> page.  It was more relevant there, and is explained in more detail.


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