Troubles with MD5SUM

[Jim Ruxton]

I'm trying to verify rh9 .isos on cds I've burned but I keep getting I/O 
errors or it just doesn't finish. I've downloaded them from RH's ftp 
server and checking them on my harddrive they are fine. Any ideas why I 
would have trouble with md5sum on CDs?  
I'm doing :
md5sum /dev/cdrom

Thanks,
Jim

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