Any software to pull an .iso from a cdr or to compare an iso file with a cdr just burned?

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Newsgroups:  comp.publish.cdrom.software,comp.os.linux.misc
Date:        Fri, 24 Oct 2003 09:46:04 +0200

> Any software to pull an .iso from a freshly burned cdr? Just thought I
> could pull the .iso and do an MD5 sum on both the pre burn and post burn
> to see if the burn was correct.

readcd

(if it fails, I doubt the burn was a proper one)

or just use diff :-)

Eric Moors

Any software to pull an .iso from a cdr or to compare an iso file with a cdr just burned?

> > Any software to pull an .iso from a freshly burned cdr?

I use 'dd if=/dev/cdrom of=outputfile bs=8k'. I find that the default block size for dd is rather slow.

> or just use diff :-)

diff is awful on very large files. And if you just want to know if there is a difference, 'cmp' is faster. It will stop when it finds the first difference and tell you how far into the file it is, but won't print the difference, good for binary files.

Elijah

Any software to pull an .iso from a cdr or to compare an iso file with a cdr just burned?

> Any software to pull an .iso from a freshly burned cdr?

Without it being mounted in Linux you can do it with "dd".

dd if=/dev/cdrom  of=slackware.iso

You can name it what ever you want since it gets the md5sum from the image.

David

Any software to pull an .iso from a cdr or to compare an iso file with a cdr just burned?

> You can name it what ever you want since it gets the md5sum from
> the image.

If you're just going to sum the image, why bother writing it to a file at all?

dd if=/dev/dvd | md5sum

I tried "md5sum < /dev/dvd", but apparently md5sum barfs on I/O errors, and dd doesn't (just complains).

On a related note, the files produced by "cat /dev/dvd > file1.iso" and "dd if=/dev/dvd of=file2" are 4096 bytes different in size (dd produced a larger file). Isn't the blocksize on a CD usually 2k? Why is there this difference?

Hactar