Long long ago, in a mailing list far far away, a Red Hat Knight once uttered: "*PLEASE MAKE SURE* that you are using the following command to burn your CDs: cdrecord -dev=x,x,x -v -dao -pad padsize=150s beta3-i386-discX.iso I have seen mediacheck fail on CDs that were written without the "-pad padsize=150s" option. I do not recommend burning the images under Win32, unless you are using cdrecord for win32, which I have verified as working correctly." Don't ask where or by whom that was uttered. I can't tell you. I will say that the person who said that above knows exactly what he's talking about, and that it was uttered in 2002. Under CentOS 4 itself, assuming an ATAPI CD burner, use something like (which is the actual command I'm using): cdrecord -dev=ATAPI:1,0,0 -v -dao -pad padsize=150s -eject CentOS-4.0-i386-bin1of4.iso k3b burnt discs can and do fail mediacheck; plus, it's faster from the command line.... This is after, of course, you verify the MD5SUMs. -- Lamar Owen Director of Information Technology Pisgah Astronomical Research Institute 1 PARI Drive Rosman, NC 28772 (828)862-5554 www.pari.edu