From owner-freebsd-questions@freebsd.org Wed Jan 29 23:29:14 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id BB9DD1FBC3A for ; Wed, 29 Jan 2020 23:29:14 +0000 (UTC) (envelope-from freebsd@edvax.de) Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.126.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "mout.kundenserver.de", Issuer "TeleSec ServerPass Class 2 CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 487KST42Psz4MDv for ; Wed, 29 Jan 2020 23:29:13 +0000 (UTC) (envelope-from freebsd@edvax.de) Received: from r56.edvax.de ([94.222.13.213]) by mrelayeu.kundenserver.de (mreue010 [212.227.15.167]) with ESMTPA (Nemesis) id 1McpaE-1jVjcX29Yo-00a0mq; Thu, 30 Jan 2020 00:29:07 +0100 Date: Thu, 30 Jan 2020 00:29:07 +0100 From: Polytropon To: Michael Sierchio Cc: "Vlad D. Markov" , FreeBSD Questions , Polytropon Subject: Re: Why is rufus not available under FreeBSD ? 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Markov via freebsd-questions < > freebsd-questions@freebsd.org> wrote: > > For some reason I wanted a bootable dos usb in the distant past. I found > > this on my computer: > > > > #!/bin/sh > > > > # empty the disk of all data > > dd if=/dev/zero of=/dev/da0 bs=1m count=2 > > > > If you're going to create a gpart partition scheme to the disk, you want to > erase the beginning and end (in the case there was already gpart scheme) > > BOOTSIZ="128k" > > DISK="$1" > > > offset=`diskinfo $DISK | awk '{ print $4 - 128 }'` > > dd if=/dev/zero of=/dev/$DISK bs=${BOOTSIZ} count=1 > > dd if=/dev/zero of=/dev/$DISK seek=$offset > > Or the equivalent.. Does this require the use of # sysctl kern.geom.debugflags=16 to allow writing to the device as shown above? It shouldn't be needed, if I remember correctly (only if the drive to be modified is the drive FreeBSD is booted from), but I could be wrong... -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...