Corrupted OS

Jerry McAllister jerrymc at
Fri Mar 16 21:40:42 UTC 2007

On Fri, Mar 16, 2007 at 01:33:42PM -0700, Drew Jenkins wrote:

> I believe you misunderstand. I have 3 disks:
> 2 are SCSI RAID and are 80 GB each
> 1 is not and is 500 GB
> I don't actually need the 500 GB now. I haven't even used up the 80 GB HD's. 
> So I can wipe the 500 GB clean. I don't have to keep data on it at all. 
> But...can I do that remotely, and run those commands remotely, with that 
> disk being unmounted, and if

You can do it remotely.   Once everything on that disk is unmounted
and unreferenced, then fdisk and bsdlabel will be happy to work on it.

The best documentation for that is down in the examples of
the bsdlabel man page.

           dd if=/dev/zero of=/dev/da0 bs=512 count=32
           fdisk -BI da0
           dd if=/dev/zero of=/dev/da0s1 bs=512 count=32
           bsdlabel -w -B da0s1
           bsdlabel -e da0s1

Change the device names to be what yours really are (da0 may be ad3 
or something.   I also upped the count on the dd, but it doesn't matter.

Follow this with a newfs for each partition except swap that you
create on this disk.

> The problem *is* a corrupt OS. I currently don't have any data on 
> that 500 GB HD. And the problems persist. Sorry to have confused you. 
> Are things clearer now?

Well, it seems clear that there is no problem with the 500 GB disk.
You can just fdisk it.   If you want, write a few blocks of zeros to
it first to make sure the system believes it clean if you want.  Probably
shouldn't need to, though.  
  dd if=/dev/zero of=/dev/extra-drive-name bs=512 count=250

As for the corrupt OS, I don't understand what that is and why
you think that or whatever.


> TIA,
> Drew2
> Jerry McAllister <jerrymc at> wrote: On Fri, Mar 16, 2007 at 09:12:02AM -0700, Drew Jenkins wrote:

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