How do you compare an iso file and a burned disk?

Hi,

All the information you need should be here: https://help.ubuntu.com/community/HowToMD5SUM

If you need any more just ask.

Cheers,

Matt

Hi again,

If this has solved your problem it would help lots if you could mark your request as solved.

Thanks,

Matt

Well, it solves problem for Ubuntu CDs, but what if I want to check if another CD matches some iso file?

Same thing, except you would use the md5sum of the 'other' ISO image file.

You can create an md5 checksum of the iso like this:

md5sum file.iso > file.iso.md5

and you can create an iso using the instructions found here:

http://ubuntuforums.org/showthread.php?t=6509

Make sure that the filename within the file.iso.md5 is the same as the iso file you've just created and then you should be able to check that their the same.

This isn't the most ideal or efficient solution, but it should work.

Cheers,

Matt

Oh yea, I also wanted to add that if you do want to get the md5 hash of a burned disk, just put it into your drive and issue the following command

md5sum /dev/cdrom

That will create an md5 hash of the disk in the drive located at /dev/cdrom.

I tried the cmp mehtod for Ubuntu server CD, but got an error:
cmp: /dev/cdrom: Input/output error

The method told in chapter MD5SUM on CD of https://help.ubuntu.com/community/HowToMD5SUM
i.e. command "md5sum -c md5sum.txt | grep -v 'OK$'" on its mount point
 outputs nothing for the same CD.

Oops, now I realise that mine wouldn't work. Sorry about that.

Your cd drive might not be at /dev/cdrom.

Insert the cd and then when the drive appears on your desktop go into that and see where it is (eg /media/cdrom )

Now type:

cat /etc/mtab | grep "whatever the location of the cd was"

From that line you can use the bit starting with /dev in the cmp and md5sum methods that williamts99 suggested.

Hope it works for you,

Matt

I get similar error from cmp even if I use the suggested /dev/something. (It does not give the error right away, but after some time.)

can i boot from a iso file without buring to cd the file is on a clean hard drive my burners down and i cant afford a new one right now and i really want to get this up and running im so tired of windows

Maybe you could use a USB flash drive stick to boot an ubuntu revision?

Try this: http://marc.herbert.free.fr/linux/win2linstall.html It lets you install Linux while using Windows.

Thanks williamts99, that solved my question.