Can someone tell me if I am approaching this wrong? I created .iso images of all of the original SuSE 9.1 Pro CDs and DVDs. Now I am wanting to compare the MD5 checksums for the CDs with that of the iso images. This worked great on the 1st 2 CDs but has gone south since. I am using the command: md5sum /dev/cdrom The odd thing is when I started getting odd readings, I ran the sum 3 times consecutively on the same CD and got 3 different values: :~$ md5sum /dev/cdrom 38e72a5efd89851ceb7349d7406ac035 /dev/cdrom :~$ md5sum /dev/cdrom 31dea26a1f7e5fd2c4f8a384c1bef8e0 /dev/cdrom ~$ md5sum /dev/cdrom 9c1e9e02ecd5401c87ac2ca59c69ee92 /dev/cdrom Shouldn't I get the same value each time? Am I misunderstanding the MD5 sums? TIA, Darrell Cormier