How can I copy files from one external hard drive to another, without erasing anything?

Hi,
I have video and photo files on one hard drive. I'd like to keep that one intact but also copy all the files to a second external hard drive. When I try to do so, I can't figure out how to open both hard drives at once. (If I open one, it closes the other window.)
Thanks for your help!
CB

Open a finder window and open up one harddrive. Then go to file>new finder window. This way you can have two finders up and select a different harddrive in each one. Then just copy and paste the files.
Hope it helps!
Ryan

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