Should md5sums match?

TSloth · 11-12-2003, 12:35 PM

I downloaded the 3 Mandrake 9.2 ISO's.
Their md5sums match what is posted on the web, so I know my downloads are good.
I used GCombust to burn the ISO's to CD-R. No errors were reported, and min buffer fill was 81%, indicating no underrun.
After the CD's were burned, just for fun I did
md5sum /dev/scd0
the result for each of the CD's was not what I got when I ran it on the ISO's.
Is this normal?

Should md5sum on the scsi device report different values than md5sum on the ISO on disk?

Thanks in advance,
- TSloth

Thymox · 11-12-2003, 01:59 PM

I wouldn't worry about it. I could be wrong, but if you're md5suming the disc itself, it might be taking into account the lead-in and lead-out data, and other things which might not be included in the ISO file. So long as the checksums for the ISO files are fine, you should be fine.

kilgoretrout · 11-12-2003, 10:29 PM

They should match but the method you used to md5sum the cd can give false negatives. See my post in this link which thoroughly discusses the problem and the solution:

http://www.linuxiso.org/forums/viewt...hlight=rawread

The script I give there can also be used to generate accurate isos for any cd.

TSloth · 11-12-2003, 11:33 PM

Thanks for your replies, Thymox and kilgoretrout.

The procedure that kilgoretrout referenced is producing the same md5sums from the CD that I got from the disk iso's and as were posted on the internet.

- TSloth