Date: Thu, 18 Aug 2005 11:15:22 -0400 From: Chuck Swiger <cswiger@mac.com> To: cdiscepola@encentrus.com Cc: questions@FreeBSD.org Subject: Re: blanking DVD+RW Message-ID: <4304A60A.6060003@mac.com> In-Reply-To: <1124376046.3696.6.camel@localhost.localdomain> References: <1124376046.3696.6.camel@localhost.localdomain>
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Claudio Discepola wrote: > I have a quick question about blanking a DVD+RW. It seems that even > after I run the "growisofs -Z /dev/cd0=/dev/zero" command the "Disc > status" is still seen as "complete" instead of "blank". Simply using dvd+rw-format doesn't erase all of the previous contents of the DVD, whereas overwriting with zeros as you've done will obscure the old data reasonably well. There is a difference between a disk which has never been written to, and a disk which has been written full of zeros. Note that someone with the right forensics technology probably could read a zeroed DVD, the same way you can read most of the data from a hard drive even after a single erasure pass. -- -Chuck
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