I would like to combine two external hard drives into one?  How do I go about doing this?

Hello:   In iPhoto I have an old external hard drive (EHD) with a photo library and a new one EHD with a photo library which has more space.  I would like to move all the photos from the old EHD to the new EDH.  Can you show me the steps to get this done so I don't lose any of my photos? I just want to use the new EHD only after the move.

Connect both drives to your mac.
Quit iPhoto, if it is runinning.
If both your iPhoto libraries have the same name, rename one of them, perhaps "iPhoto Library 1.photolibrary" and "iPhoto Library 2.photolibrary", so you will not overwrite one of them, when you move them to the same drive.
Select the library one in the Finder and drag it from the old drive to the new drive.
Now launch iPhoto while depressing the option (alt) key and selecting the library in the new location. This way you can switch between the libraries.
If you want to combine the two libraries into one single library, you will need another program. iPhoto Library Manager can merge libraries into one. 
Download here: iPhoto Library Manager

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