faulty CDROMs

[gbburkhardt at verizon.net (Glenn Burkhardt)]

> From: Bob Gorman <bob at rsi.com>
> At 08:00 AM 1/25/2005, gbburkhardt at verizon.net wrote:
> >is there an easy way of getting an MD5SUM from a CD
> 
> dd if=/dev/cdrom | md5sum
> 

This doesn't work for me.  With a CD that compares correctly against a 
loopback device mounted ISO file image with 
"diff -r /mnt/cdrom /mnt/iso_image", I get a different md5sum when reading the 
data with 'dd'.