8.0 can't find/read label on da3 (7.2 OK)

[John Marshall]

On Sat, 21 Nov 2009, 20:14 +0100, Johan Hendriks wrote:
> >If I boot 7.2-RELEASE from a live CD, bsdlabel happily reads the /da3s1
> label, I can fsck the da3s1d UFS filesystem, >and I can mount the
> filesystem.  If I boot 8.0, I lose the disc again.
> 
> This is probably a dangerous dedicated disk made on 7.x
> 
> I had this issue also and some member of the list gave me this hint:
> 
> !!!!!!!!!!!!!!DO MAKE A BACKUP OF YOUR DATA BEFORE DOING THIS FROM YOUR
> 7.2 INSTALL !!!!!!!!!!!!!!!!!!!
> 
> 
> Is your disk in "dangerously dedicated" mode?
> 
> If yes, this is what I did (advised by marcel@)
> 
> dd if=/dev/zero of=/dev/ad1 oseek=1 bs=512 count=1
> 
> where /dev/ad1 is my device. You should see some messages from
> GEOM_LABEL removing and assigning new labels.

Thank you Johan,

Yes, this disc was partitioned in "dedicated" mode.  The above recipe
solved my problem.

It may be a good idea for somebody knowledgeable in this field to give
attention to the "Dedicated Mode" Section 18.3.2.2 of the Handbook if
this mode now unsupported.

-- 
John Marshall
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