Problem to burn iso image with disk utility

hi,
i burnt an iso image file on a cd using disk utility.
I checked the md5 of the burn, and found it is different than the original iso file.
how do i create an EXACT iso image burn?
more details:
i downloaded file.iso from the web, inserted a blank CD, opened disk utility, chose "burn", then located the image, and confirmed.
after the disk utility announced "success", i wanted to check that the md5 of the burnt cd matches the original. so i used "dd if=/dev/disk1 of=~/file.dd" but i got a completely different file than the original file.iso...
not only that the md5 not match (which could be due to some extra 0 bytes), but i even compared the two files using xxd, and they look similar, but every now and then file.dd (=copy of the brunt CD) has a extra chunk of garbage bytes (and then the files are again the same, and then another chunk of garbage, etc.)
so how do i create a 1:1 burn of file.iso?

The problem here is that most Mac disc utilities, including the built-in Disk Utility, take a different approach when it comes to image burning. Instead of telling the program you want to burn an image, then choosing the file, you're supposed to do the reverse: You choose the file, then tell the program you want to burn it. So, to burn an ISO image to disc, here's what to do:
1.Insert a blank disc.
2.Start Disk Utility.
3.From the File menu, choose Open Disk Image and select the ISO to be burned.
4.In the list of volumes, you will now see an item representing the ISO file.
5.Select it.
6.Click the Burn button and follow the instructions.

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