You might find a performance inscrease when accessing files by using hdparm. Here is a tutorial. http://linux.oreillynet.com/pub/a/li...29/hdparm.html
If your modem worked under Mandrake, there is a really good chance it would work under RedHat. Just a matter of finding the correct package. If you post more info on your hardware, we might be able to help you with that.
MP3 support is not enabled by default on Red Hat, because it involves propietary code. You can read more about it on this thread: http://www.linuxjunior.org/yabbse/in...;threadid=6362