Here are the easy way to Move the Complete National Geographic DVD (2009) to an External Hard Drive for easy viewing.  This makes the DVD a great deal ($40 at Cosco) when compare to the pre loaded Hard Drive ($200).  This works for both OS X Leopard and Windows 7 (should also work on Window XP and Snow Leopard but need to be tested).

Step 1 - Before any installation Copy the entire content of all the DVDs to the root (i.e. D:\) of the external drive.  You will end up with the installation programs, other files, and the six folder with the content (Disk1 to Disk6).

 NOTE:  copying them in a subdirectory instead that the bottom level (root level) does not work.

Step 2 - run the installation program from the external drive (this is key).

Step 3 - open the program and click ok when it asks to insert Disk 1.  The program will look for disk 1 on the drive that was installed from, the external drive, and will find all others automatically.

NOTE: If you had already install the program from the DVD before reading this uninstall the program using the uninstaller and manually delete the Data folder and all its content.  The data folder name starts with "com.nationalgeographic" for all platform.  Actual location listed below.