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Date: Sat, 25 Apr 2015 15:14:39 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: reg@dwf.com
cc: freebsd-questions@freebsd.org
Subject: Re: Install to a Partition problems.
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On Sat, 25 Apr 2015, reg@dwf.com wrote:

> How do I get FreeBSD to install to the 2nd partition of a
> MBR partitioned disk.  The first partition has PCBSD on
> it if this is a complication.
>
> I see nowhere where I can choose a partition (ok slice), and
> the Installer always shows me that it it going to overwrite
> my partiation/slice 1.

In bsdinstall, you must choose Manual Partitioning.  After that, Guided, 
then Partition.  Then you must create a new partition by highlighting 
the disk name and choosing Create.  The Handbook chapter shows some of 
this: 
https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/bsdinstall-partitioning.html

I have not tested this lately, so I strongly suggest making a full 
backup of the disk first.  Also, MBR makes this much more complicated 
because MBR is limited to only four partitions (slices), so BSDlabel 
partitions must be created inside the MBR partition (slice).