ea1...@gmail.com (Ramiro Aceves) writes:
> The following options are available:
> -f Force an update, even if there has been no change.
> -q Performs operations in a quiet fashion.
> -r In conjunction with -w, also update the on-disk label.
> -s sector Specifies the logical sector number that has to be read from
> the disk in order to find the MBR. Useful if the disk has
> remapping drivers on it and the MBR is located in a non-
> standard place. Defaults to 0.
> -w Update the in-core label if it has been changed. See also -r.
>I do not know the difference between the in-core and on-disk options,
>what I should use and if I can break something with it.
The BSD partition information (aka "disklabel") exists in memory ("in-core")
and is also written to disk ("on-disk").
If you change only in-core, the change is temporary and volatile. When
the disk is no longer in use, or after a reboot, the changes are gone.
For permanent changes you need to write the on-disk label.
I.e. use
mbrlabel wd0
to show how the disklabel would look like, and use
mbrlabel -rw wd0
to actually change the disklabel permanently.
