corrupted ISO or corrupted CD?

[ogross74]

Hi there. I had downloaded FC3 (via bittorrent) and burned the ISO files. The problem is that none of the CDs passes the test. I tried to burn new CDs, yet again all failed. How do I know if this is a CD problem or the files are curropted?

Thanks

[BiOPSY]

Do an install without media checking.
My FC3 disks did th same thing but the install didn't fail.

[xorp]

Run an md5sum on the FC3-...iso files and check them with the md5sums posted on ....
http://linuxiso.org for instance.

Just run:

> md5sum iso_file_name

That would tell you if the iso images are OK or not.

As for installing without the CD test passing, well... that's an individual preference

[imdeemvp]

At what speed did you burn cd's? I recommend no more than 16x.

[WebWind]

I have got same problem. Media check failed at all 4 CD.
No problems with instalation

[bryancole]

Did you use Nautilus to burn the CDs? I've found that CD burned with nautilus (the FC2 version) fail the media check, but if I use xCDRoast, they work fine. Note, if you run the FC3 install with the boot-option "linux ide=nodma", all the CD then pass the media check and the install works fine (I've not tried installing from my disks without the ide=nodma option). I think this is a bug in the FC2 gnome-cd burner but I'm not 100% sure.

[Prem]

I use Azureus bittorrent client for downloading and have had corrupted iso files a few times. Strange, I thought bittorrent clients were designed to 'not' result in corrupted downloads! I found the download was corrupted after burning couple of coasters, and now I never burn a iso file to cd or dvd without checking the md5sum first.

After bruning the cd/dvd, to check if the cd burning was correct or not, I create an iso file again from the cd/dvd and check its md5sum.

Fedora core does not usually require creation of iso file from cd/dvd as it has the media check but I have seen some drives cause the check to fail (sony ddu1621, and a creative cd drive for which I dont have the exact model number now) while same cd will pass the media check in another drive (sony dru-700a).

I burn cd/dvd on windows with nero which can create an iso file from the cd/dvd. Anyone know of a free utility on windows which will create iso file from a cd as well as dvd?

[RJ45]

Use cdrecord -dao option.

I had the same exact symptom - good ISO MD5SUM files, but failed the Redhat
mediacheck tests. Default for cdrecord is -tao, which mediacheck barfs on.

-RJ

[wneumann]

Disks 2, 3 and 4 all failed mediacheck for me although the ISOs had correct md5sum. I burned them again and same result. I then mounted the ISOs one by one and did a file-by-file diff with the CD and found no differences. It seems that mediacheck is flaky?

Here is what I did as root:
mount /dev/cdrom
mount -o loop -t iso9660 -r /cdimages/FC3-i386-disc4.iso /mnt/iso
diff -r /mnt/cdrom /mnt/iso