Date: Thu, 19 Jul 2012 15:10:13 +0100 From: Bruce Cran <bruce@cran.org.uk> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: jhs@berklix.com, freebsd-questions@freebsd.org, Robert Bonomi <bonomi@mail.r-bonomi.com> Subject: Re: fsck on FAT32 filesystem? Message-ID: <50081545.3020306@cran.org.uk> In-Reply-To: <alpine.BSF.2.00.1207191014310.7414@wojtek.tensor.gdynia.pl> References: <201207190253.q6J2r3p0070058@mail.r-bonomi.com> <alpine.BSF.2.00.1207191014310.7414@wojtek.tensor.gdynia.pl>
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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
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