November 4, 2013
To quickly create a collection from a folder of images in Lightroom, drag the folder from the Folders panel into the Collections panel. If you drag a folder that contains subfolders, it will create a single collection including all of the files in the parent folder and all subfolders.
April 12, 2012
If you skip ahead in this video to @ 4:38 (Questions about Lightroom and Photo Management), I talk about how to archive or move your images from your internal drive to an external one. As you will see, it is easiest to move the files to the new drive from within Lightroom.