From owner-freebsd-questions@FreeBSD.ORG Thu Jul 19 14:10:17 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 411DE1065672 for ; Thu, 19 Jul 2012 14:10:17 +0000 (UTC) (envelope-from bruce@cran.org.uk) Received: from muon.cran.org.uk (muon.cran.org.uk [IPv6:2a01:348:0:15:5d59:5c40:0:1]) by mx1.freebsd.org (Postfix) with ESMTP id C073F8FC08 for ; Thu, 19 Jul 2012 14:10:16 +0000 (UTC) Received: from muon.cran.org.uk (localhost [127.0.0.1]) by muon.cran.org.uk (Postfix) with ESMTP id 9FA08E6579; Thu, 19 Jul 2012 15:11:54 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=cran.org.uk; h=message-id :date:from:mime-version:to:cc:subject:references:in-reply-to :content-type:content-transfer-encoding; s=mail; bh=jIr+vniVKBx5 bIZYIgLyFKBYKR8=; b=nW4NG1DckY9bevdaFcqdByCoNbv/EMY/tu3gCP1twSCQ AQ6ihA8YbxN8qI4ngaK99I5q60SA5lJq8Lx+rNE5iJ4DMNQ24tIDxo/tNL1hsvi8 S9zu/CeAS/9ea1g04moiXv0zEc5r+GCC47yJKGAJLfLDayNi0KcirqJj8rYvJBU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=cran.org.uk; h=message-id :date:from:mime-version:to:cc:subject:references:in-reply-to :content-type:content-transfer-encoding; q=dns; s=mail; b=ypS09r f1TOeVvKIMQKRN3BQDWC35oXmZn3olitPDwjxH+MwFksvsKHRqfrgwvpj0yOahuO WtrAEsrKc8Cq9xY8HAfXuz8rk2w1AZLKoyfdGZWtlmeTD6rxzu7KiXSomdZqZQ0q 8fsRtyqAmYgwFRbAiQccGyjjN2YiZEqU1E6WM= Received: from [192.168.2.11] (unknown [93.89.81.205]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by muon.cran.org.uk (Postfix) with ESMTPSA id 6FE65E6578; Thu, 19 Jul 2012 15:11:54 +0100 (BST) Message-ID: <50081545.3020306@cran.org.uk> Date: Thu, 19 Jul 2012 15:10:13 +0100 From: Bruce Cran User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20120713 Thunderbird/14.0 MIME-Version: 1.0 To: Wojciech Puchar References: <201207190253.q6J2r3p0070058@mail.r-bonomi.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: jhs@berklix.com, freebsd-questions@freebsd.org, Robert Bonomi Subject: Re: fsck on FAT32 filesystem? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Jul 2012 14:10:17 -0000 On 19/07/2012 09:15, Wojciech Puchar wrote: > no. for modern hard drives it was already proved that > > dd if=/dev/zero of=/dev/disk bs=1m > > is enough to make data unreadable. > > for very old drives it may not How about data stored in remapped sectors, or any flash cache? The Secure Erase command (https://ata.wiki.kernel.org/index.php/ATA_Secure_Erase) may clear all that data too, but without any guarantees it's better to destroy the disk than risk leaving classified data on it. -- Bruce Cran