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Date: Mon, 11 Jul 2005 15:27:16 +0200
From: Mario Hoerich <lists@MHoerich.de>
To: Lee Harr <missive@hotmail.com>
Message-ID: <20050711132715.GA94678@Pandora.MHoerich.de>
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Cc: freebsd-questions@freebsd.org
Subject: Re: dd to unused partition (Hey! someone stole my foot-shooting
	gun!)
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# Lee Harr:
> dd if=iso of=/dev/ad0s1
> 
> but what I am getting now is ...
> 
> dscheck(#ad/0x200002): fixlabel: invalid magic
> fixlabel: invalid magic
> dd: /dev/ad0s1: Read-only filesystem

This error isn't new, it just, well, doesn't happen very
often:

kern/subr_diskslice.c:
| static char *
| fixlabel(sname, sp, lp, writeflag)
[...]
|   /* These errors "can't happen" so don't bother reporting details. */
|	if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC)
|		return ("fixlabel: invalid magic");

Prior reports seem to indicate this fails if non-ufs slices
somehow got themselves a disklabel.

According to <URL:http://makeashorterlink.com/?S37C2186B>[1]
a workaround might be using

  dd if=/dev/foo of=/dev/ad0 oseek=63


 HTH,
Mario
___________
[1]: This is really
<URL:http://groups.google.de/group/mailing.freebsd.questions/browse_frm/thread/46bc3662805a349c/146b0cdc6e294288?q=dscheck+fixlabel&rnum=3&hl=de#146b0cdc6e294288>.