Date: Mon, 25 Aug 2014 13:19:03 -0700 From: Michael Sierchio <kudzu@tenebras.com> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: some ZFS questions Message-ID: <CAHu1Y70j-GbZWZMzvGHR5PqrgYzxhDxah8vB6hxWWhe1L2XgHQ@mail.gmail.com> In-Reply-To: <20140825182440.GA57059@slackbox.erewhon.home> References: <201408070816.s778G9ug015988@sdf.org> <40AF5B49-80AF-4FE2-BA14-BFF86164EAA8@kraus-haus.org> <201408211007.s7LA7YGd002430@sdf.org> <20140822005911.GA52625@neutralgood.org> <201408241027.s7OARfEK004658@sdf.org> <53FB0AFD.6010507@cyberleo.net> <20140825182440.GA57059@slackbox.erewhon.home>
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On Mon, Aug 25, 2014 at 11:24 AM, Roland Smith <rsmith@xs4all.nl> wrote: > With modern drives the data density is so high that it is almost impossible to > retrieve single overwritten bits, let alone bytes or files if the complete > disks was filled with zeroes. That is unfortunately naive - all modern drives, whether spinning platters or SSDs, silently remap sectors when they detect incipient errors, for wear leveling in the case of SSDs, etc. This means that it is possible for someone with direct access to the disk to recover whole sectors - sectors that you cannot erase, no matter how many synchronous writes you perform in the OS. - M
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