Re: [gentoo-user] Re: Reading a DVD as an ISO image

[Marcus Wanner <marcusw@cox.net>]

On 11/17/2009 10:40 AM, Grant Edwards wrote:
> On 2009-11-17, Jos? Romildo Malaquias <j.romildo@gmail.com> wrote:
>
>   
>> Once I have written a dvd ISO image to a dvd-r disk and then I have
>> deleted the image from the hard disk. Now I need the image again, but
>> reading the image from disk does not give me an identical image to the
>> original one.
>>
>> I have used the commands
>>
>> $ readcd -vvv dev=/dev/dvd f=image.iso
>>
>> and
>>
>> $ dd if=/dev/dvd of=image.iso
>>
>> With both commands, the resulting image is 99.9% identical to the
>> original one.
>>     
>
> If you deleted the original, how do you know? the one you're
> creating from the DVD isn't identical?
>
>   
>> Is there anything I can do to get an image identical to the
>> original one?
>>     
>
> Since you still seem to have a copy of the original ISO, just
> use it.
>   
My guess is that he has a slow internet connection, he downloaded a 
large iso, burned it, deleted it, and now wants to get the iso back 
without downloading it again, but he has access to the checksum/filesize 
of the original iso from the place he downloaded it, and when he makes 
an iso, the checksum/filesize does not match.

Marcus