sysctl kern.geom.debugflags ERROR when using Sysinstall to format HD (FreeBsd 7.2 STABLE)

Matthew Seaman m.seaman at
Tue Sep 29 19:20:32 UTC 2009

Jeronimo Calvo wrote:
> Hi folks!!
> Trying to create a new Ufs on a HD using sysinstall. im getting the
> following error:
> ERROR: Unable to write data to disk ad10!      │
>                │                                               │
>                │To edit the labels on a running system set     │
>                │sysctl kern.geom.debugflags=16 and try again
> any ideas?

At a guess, I'd say you need to set

  sysctl kern.geom.debugflags=16

and try again...


Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP:     Ramsgate
                                                  Kent, CT11 9PW

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