On Sat, Oct 2, 2010 at 4:40 AM, Andre Robatino <robat...@fedoraproject.org>wrote:
> JD <jd1008 <at> gmail.com> writes: > > > I burned Fedora-14-Beta-i386-DVD.iso to blank dvd. > > One time I used wodim, and 2nd time I used growisofs. > > After each burn, I would dd the dvd back in: > > > > dd if=/dev/sr0 of=f14.iso bs=2k > > > > In both cases the size of f14.iso was 10240 bytes larger than > > Fedora-14-Beta-i386-DVD.iso. > > In general this won't work unless dd is told exactly how much to read off. > Unfortunately, it works often enough that people think it's supposed to. > Use the > rawread script from > > http://www.troubleshooters.com/linux/coasterless.htm#rawread > > instead. This determines the ISO size from the ISO header and then > automatically > reads off the right amount. > > There is a defect in the Live and netinst images (which started in F12 > Alpha, > and only affected i386 and x86_64, not ppc), in that they are larger than > the > ISO header indicates: > > https://bugzilla.redhat.com/show_bug.cgi?id=585006 > > To read these off properly, the rawread script won't work, since it assumes > that > the ISO header size is correct. Instead, you have to manually compose a dd > command that reads off the size corresponding to the actual ISO file (not > the > size in the ISO header). > One can also tell dd to read by single physical layer sectors using the "bs=2048" option. This may increase the read time a bit, but generally results in s more consistent chance of getting the correct size. -- G.Wolfe Woodbury
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