Re: fdisk BSD disklabel support?

[Karel Zak <kzak@redhat.com>]

On Thu, Aug 06, 2015 at 07:34:40PM -0700, Matt Turner wrote:
> I'm not able to figure out how to make a BSD disklabel in fdisk since v2.23.
> 
> Gentoo's installation guide describes the process of partitioning a
> disk for SRM/Alpha [1]. How should one do this now?
> 
> With my distro's util-linux-2.25 I don't see any option that resembles
> BSD disklabels -- I see only
> 
>   Create a new label
>    g   create a new empty GPT partition table
>    G   create a new empty SGI (IRIX) partition table
>    o   create a new empty DOS partition table
>    s   create a new empty Sun partition table
> 
> What am I missing?

 You have to create a DOS (MBR) label first, and then there is 

   DOS (MBR)
      a   toggle a bootable flag
      b   edit nested BSD disklabel
      c   toggle the dos compatibility flag


 For example:

 # fdisk /dev/sdc
 ...
 Command (m for help): n
 Partition type
    p   primary (0 primary, 0 extended, 4 free)
    e   extended (container for logical partitions)
 Select (default p): p
 Partition number (1-4, default 1): 
 First sector (2048-1023999, default 2048): 
 Last sector, +sectors or +size{K,M,G,T,P} (2048-1023999, default 1023999): 

 Created a new partition 1 of type 'Linux' and of size 499 MiB.
 ...
 Command (m for help): t                           <----!!!
 Partition type (type L to list all types): a5
 Changed type of partition 'Linux' to 'FreeBSD'.
 ...
 Command (m for help): b                           <----!!!
 The device /dev/sdc1 does not contain BSD disklabel.

 Do you want to create a BSD disklabel? [Y]es/[N]o: y
 ...
 Command (m for help): p
 ...
 Slice Start     End Sectors   Size Type     Fsize Bsize Cpg
 c      2048 1023999 1021952   499M unused       0     0   0
 d         0 1023059 1023060 499.6M unused       0     0   0


  Karel

-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com