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_at_) > > 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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