Even if you got them from a trusted source doesn't mean the data didn't get
corrupted in transit.  I downloaded the two isos from another pluggers site, but
while I could burn them to a cd and also mount them on the loopback they
wouldn't work to do the install.  The md5sums were different from what was
published on RH site.

> Having aquired the RedHat 7.1 CDs, I ran the MD5SUM program against them.
> I get different answers than the answers published by RedHat.  The CDs
> appear good otherwise, though I have not installed from them yet.  I got
> them from a trusted source too.
> 
> Should I be worried about the checksum difference?