Simple response ... go read about them. That's the fastest way to answer your question, and for you to get the information.
<A HREF="http://www.safedisk.od.ua/main_e.html" target="_new">http://www.safedisk.od.ua/main_e.html</A>
<A HREF="http://www.elby.org/CloneCD/english/" target="_new">http://www.elby.org/CloneCD/english/</A>
It's amazing what you can do with a search engine and five minutes of your time.
Toejam31
<font color=red>My Rig:</font color=red> <A HREF="http://www.anandtech.com/mysystemrig.html?rigid=6847" target="_new">http://www.anandtech.com/mysystemrig.html?rigid=6847</A>
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<font color=purple>"Procrastination on your part does not constitute an emergency on my part."</font color=purple>