iso image size version 8.10

[Ray Parrish]

Tommy Trussell wrote:
> On Sat, Feb 14, 2009 at 1:30 PM, Ray Parrish <crp at cmc.net> wrote:
>   
>> Hello,
>>
>> 715,592 / 1024 = 698.8203125 MBs which is just under the 700 MB limit of
>> most CDs. I just downloaded the Ubuntu 8.04.2-desktop-i386.iso and it is
>> only 679 MBs. However when I burn it with wodim from the command line,
>> wodim claims it is burning a total of 834 MBs to the disc, and after
>> ending up with a total of 8 worthless coasters, instead of getting any
>> good CDs, I have given up on making a new Ubuntu Live CD.
>>
>> I read man wodim very carefully, and did the burn on the slowest speed
>> available on my burner, with all of the correct options enabled, but
>> none of the attempts I've made will boot, they always fail part way
>> through loading the kernel after the initial menu shows, no matter which
>> option I select. Here's the actual command line I used for the last
>> burn, after carefully testing it withe -dummy option and getting no errors.
>>
>> ray at ray-desktop:~$ sudo wodim -v -raw96r -speed=0 dev=/dev/scd0
>> gracetime=20 driveropts=noburnfree -data tsize=731869184
>> "/home/ray/Downloads/ubuntu-8.04.2-desktop-i386.iso"
>>
>> I did also do a check on the MD5sum for the image file before burning as
>> well. One thing that I did think was odd, was that wodim insisted on
>> burning a 150 byte lead in at the start of the track before starting on
>> the actual data.
>>     
>
> I don't know wodim, but "lead in" makes me think maybe it could be
> burning it as an audio CD?
>
> I haven't had any trouble burning .iso files using the right-click
> "burn to disk" feature in nautilus, even on slower systems where you
> might expect speed to be a problem ...
>   
Well, the purpose of the -data option in the command line is to burn it 
as a data CD, instead of Audio, but until I do some more research  I'm 
not going to discount the possibility that it is ignoring the switch, 
and burning in Audio mode, as that is it's default mode according to the 
man page.

The first disc I tried to burn, I created with a right click from 
Nautilus per the instructions on the Ubuntu How To page or burning 
.iso's. When that didn't work, I rebooted to Windows, and downloaded and 
installed the recommended InfraRecorder, and followed the instructions 
for it's use to make the next one. It didn't work either.

I also wasn't able to understand how wodim came up with the figure of 
834 MBs written to disc, when the discs are only 700 MB in capacity. The 
tsize=731869184 parameter is supposed to tell wodim the size of the data 
track to burn to disc, and is the exact size of the .iso file in bytes.

I even tried one burn with Brasero from within Ubuntu, as it has options 
for burning iso's as well. So far I haven't managed to make a CD that 
will get all the way through loading the kernel without an i/o error, 
and the error message that it must reboot.

The command for using wodim to burn a data CD  from an .iso on the 
Ubuntu Community CD/DVD command line burning page was given as follows, 
which I tried for the third disc I wrote. Note that it doesn't specify 
nearly as many parameters and options as the command I later formulated 
by reading the man page. It of course also failed to make a good CD.

wodim dev=/dev/scd0 driveropts=burnfree -v -data cd_image.iso

Later, Ray Parrish

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