dd question

Warren Block wblock at wonkity.com
Mon Sep 28 18:15:43 UTC 2015

On Sun, 27 Sep 2015, William A. Mahaffey III wrote:

> On 09/27/15 20:07, Warren Block wrote:
>> On Sun, 27 Sep 2015, William A. Mahaffey III wrote:
>>> If I use disklabel to add a 'd' slice, will that mess up what is already 
>>> there ? What is the syntax for that, I don't see it in the 
>>> disklabel/bsdlabel man page ? The man page for disklabel/bsdlabel shows a 
>>> way to initialize a whole disk using 'fdisk -BI <dev>' & implies that this 
>>> will create a 'da0s1' slice in the process. However it will also wipe out 
>>> what is already there. If I do that, can I then copy the img-file contents 
>>> in some way ? Thanks & TIA :-) ....
>> Please stop using fdisk and bsdlabel.  gpart(8) does everything they do and 
>> is easier to use.

> I (think I) am using them because of the way the install image is put 
> together, & I am trying to work around a perceived issue.

Again, gpart(8) does everything they do.  By that, I mean that gpart(8) 
can create bsdlabel partitions and MBR slices in addition to GPT and 
other partitioning schemes.

None of these programs will resize a filesystem already present on a 
partition.  growfs(8) does that for UFS.

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