FC3 ISO Weirdness

Grand Demon granddemon at gmail.com
Mon Jun 13 20:26:33 UTC 2005


Kam, That sounds like a good idea. I did buy high-quality (Memorex
52x) CD-Rs. On my Windows PC (the one utilizing Nero), I have a 52x
burner so I did do the max speed. However, on my Mac, the CD-burner is
a much lower speed (not quite sure what it is exactly, but I assume
12x). That should have burnt it at 12x, which could explain why the
one from my Mac worked better than the one generated from within
Windows. I never thought about the speed of the burn causing
differences, so thanks for the insight.

Gerry, I did burn it correct (as a disk image, and DAO). When opening
the disk all of the directories and files are there. The install would
not have succeeded if I burned the ISO to the CD as if it were just a
file.

Grand Demon

On 6/12/05, Kam Leo <kam.leo at gmail.com> wrote:
> On 6/12/05, Grand Demon <granddemon at gmail.com> wrote:
> > Today I downloaded the four Fedora Core 3 ISO images. I calculated the
> > md5 checksums with the md5sum utility and all four matched up to the
> > expected values.
> >
> > However, when I burned the images in Nero (under Windows) and set it
> > to verify the disks, Disk Two and Disk Three failed. It stated that
> > certain Sectors could not be read. Those same two disks failed under
> > Fedora Core's media test.
> >
> > I also tried to burn the Disk Two image in Toast (under Mac OSX). When
> > that verified the disk, it also failed with 'Sector xxx could not be
> > read' errors. I went through with the install anyway. Disk one's files
> > worked fine (as expected), but Disk Two failed out on one file. When I
> > tried the second Disk Two disk (the one I burned under Mac OSX) did
> > work, however. I didn't have many files coming off Disk Three, so it
> > didn't fail. Disk Four also went fine.
> >
> > What I am wondering is two things. 1) Why would the verification and
> > burning of the disks fail under two different OSes and burning
> > programs despite the md5 checksum being correct? 2) Why would the Mac
> > OSX-burned disk be corrupted in different areas than the
> > Windows-burned disk?
> >
> > I have not tried to burn/verify Disk Two and Three under Linux because
> > I don't want to "waste" another CD-R. I assume it will generate
> > similar results. Any insight on what occurred here would be great. The
> > install was successful so that isn't the problem... I am just curious
> > as to what caused these anomalies...
> >
> > --
> > Grand Demon
> >
> 
> Media as well as burners are not created equal. Your burner may not
> have a burning algorithm that exactly matches this particular
> manufacturer. Although the media may be listed as 48X or higher you
> may need to use a much lower speed in order to get satisfactory
> results. Try setting the burn speed to 10X or 12X. If you bought
> really cheap or no-name brand media you may need to go even lower.
> 



On 6/12/05, Gerry Doris <gdoris at rogers.com> wrote:
> On Sun, 2005-06-12 at 21:22 -0400, Grand Demon wrote:
> > Today I downloaded the four Fedora Core 3 ISO images. I calculated the
> > md5 checksums with the md5sum utility and all four matched up to the
> > expected values.
> >
> > However, when I burned the images in Nero (under Windows) and set it
> > to verify the disks, Disk Two and Disk Three failed. It stated that
> > certain Sectors could not be read. Those same two disks failed under
> > Fedora Core's media test.
> >
> > I also tried to burn the Disk Two image in Toast (under Mac OSX). When
> > that verified the disk, it also failed with 'Sector xxx could not be
> > read' errors. I went through with the install anyway. Disk one's files
> > worked fine (as expected), but Disk Two failed out on one file. When I
> > tried the second Disk Two disk (the one I burned under Mac OSX) did
> > work, however. I didn't have many files coming off Disk Three, so it
> > didn't fail. Disk Four also went fine.
> >
> > What I am wondering is two things. 1) Why would the verification and
> > burning of the disks fail under two different OSes and burning
> > programs despite the md5 checksum being correct? 2) Why would the Mac
> > OSX-burned disk be corrupted in different areas than the
> > Windows-burned disk?
> >
> > I have not tried to burn/verify Disk Two and Three under Linux because
> > I don't want to "waste" another CD-R. I assume it will generate
> > similar results. Any insight on what occurred here would be great. The
> > install was successful so that isn't the problem... I am just curious
> > as to what caused these anomalies...
> >
> > --
> > Grand Demon
> >
> I assuming you are burning these as iso images and not as one large
> file.  You can check this by trying to open the disk.  You should see
> all the directories not just the original file.
> 
> The other thing that's caused me problems is that they have problems if
> burned as "Track at Once".  Burn them as "Disc at once".
> 
> Gerry
> 


-- 
Grand Demon




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