Warren Block wrote: > On Fri, 24 Feb 2012, Omer Faruk SEN wrote: > >> Already done that but still habe the same issue. I can dd and sysctl but >> after installing without using W at disk label screen still no luck. I >> have also done >> sysctl kern.geom.debugflags=16 on fixit and restarted installation but >> still getting the same error. > > [Please don't top-post, it makes responding more difficult.] > >>> If you need to clear the old MBR the "old way", use a LiveFS or Fixit >>> shell and do this (as root): >>> >>> sysctl kern.geom.debugflags=16 and: >>> >>> dd if=/dev/zero of=/dev/adx oseek=1 bs=512 count=1 > > The sysctl is not necessary. The dd may not erase enough of the disk. > It will erase a bsdlabel, but not the MBR/PMBR. As always, be warned > that this will erase the partition table on that disk, so make sure it's > the correct target disk and that you have full backups: > > dd if=/dev/zero of=/dev/adX bs=512 count=34 ^^^^^^^^ Excellent idea here. It covers GPT too, for as if a Linux distro was on the disk previously, or anything else using GPT. For me I only needed the one because my problem was only a change from FBSD 6.2 to 7.x something, no GPT involved - my problem was only disklabel related. > Replace X with the correct drive number.
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