Date: Wed, 16 Dec 2009 12:55:38 +0200 From: Andriy Gapon <avg@icyb.net.ua> To: Marian Hettwer <mh@kernel32.de> Cc: freebsd-stable@freebsd.org Subject: Re: update to 8.0-RELEASE --> partition gone Message-ID: <4B28BCAA.1010002@icyb.net.ua> In-Reply-To: <5cc508f1797d04d0c64bdba1d4a12ff4@localhost> References: <7BA0C6CC-A1D9-49C2-942D-D46C19E9B3CB@mac.com> <5cc508f1797d04d0c64bdba1d4a12ff4@localhost>
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on 16/12/2009 11:28 Marian Hettwer said the following: > Hej Marcel, > > > On Tue, 15 Dec 2009 16:46:27 -0800, Marcel Moolenaar <xcllnt@mac.com> > wrote: >> Yes, if you have ad2a and not ad2s1a, then you have a >> proper dangerously dedicated disk and FreeBSD 8.x will >> work correctly with your disk. >> >> If you installed "dangerously dedicated" and ended up >> with ad0s1a (note the "s1"), then you have an invalid >> partitioning and FreeBSD 8.x will not give you what >> you've been getting on FreeBSD 7.x. Most of the time >> you only need to wipe out the second sector on the >> disk to clean it up and have FreeBSD 8.x also give >> you ad0s1a. >> > okay... but how do I wipe out the second sector? > dd if=/dev/zero of=/dev/ad8 count=1 > would wipe out the first 512 bytes. You need to add seek=1 (or oseek=1, which is the same but a little bit more obvious) to that command. > I'm always confused with sectors vs. > bytes. You are not confused this time, HDD sector is 512 bytes. This is the default dd block size too. -- Andriy Gapon
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