Date: Mon, 26 Sep 2016 15:39:19 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> To: "Hartmann, O." <ohartman@mail.zedat.fu-berlin.de>, FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: Destroy GPT partition scheme absolutely, how? Message-ID: <57E92507.6020900@quip.cz> In-Reply-To: <20160926150109.0d0d793e@hermann>
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Hartmann, O. wrote on 09/26/2016 15:01: [...] > Using a fresh/new SD or USB resolves the problem. But the question > remains: how can I destroy any relevant GPT information on a Flash > drive (or even harddisk) to avoid unwanted remains of an foul image > installation? > > First guess was to write the last couple of bytes on such a flash drive > by letting dd(1) counting backwards, but I couldn't figure out how to > let dd(1) do such a procedure. The nightmare didn't end, while trying, > the SD flash card died :-( I use dd if=/dev/zero almost everytime when I need to install system on used HDD. I rewrite about 10MB on its start and then about 10MB on the end. I have some script to do this - simply takes media size from diskinfo command, substract 10MB and then dd with seek Hope that it will help you Miroslav Lachmanhome | help
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