Re: size discrepancy

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On 10/02/2010 01:40 AM, Andre Robatino 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).
Thank you Andre.
Very good info!!

JD
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