Date: Sun, 23 May 2010 15:23:26 -0700 From: Doug Hardie <bc979@lafn.org> To: freebsd-questions - <freebsd-questions@freebsd.org> Subject: Verifying a DVD Message-ID: <76E02DE6-9A61-4D24-9638-ABB7418711D9@lafn.org>
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I am periodically backing up a bunch of files to DVD. I use mkisofs to = create the original image and growisofs to write it to a real DVD. = However, at that point I want to verify that the write was successful. = I tried using dd to read back in the DVD to a file. Its interesting = that the bs parameter must be at least 2048 or dd complains about a = parameter error. However, the big issues is that the original image = file is shorter than the read file. The difference is 10240 bytes. = This difference is the same for bs 2048, 10240, or 102400. It appears = that dd is adding one last block. Is there a way to prevent this or = remove that block?=
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