I have written about moving your Lightroom work from your laptop to your desktop (or any two computers) here. This involves exporting your work on the laptop as a catalog, then importing it into your desktop catalog.
Sometimes though you may want to simply move your catalog. Mine was initially on an external hard drive; I then decided to move it to my internal C: drive because it would read and write faster.
The first step in doing this is finding out where it is stored currently.
- In Lightroom go to Edit>Catalog Settings on the PC, or Lightroom>Catalog Settings on the Mac.
- In the General Tab, the location of your catalog is shown.
- Click on the Show button to open up a Mac Finder or Windows Explorer window with this catalog folder highlighted.
- Next, open up a second Windows Explorer or Finder window; navigate to where you want to put your catalog folder, and then drag the Lightroom Catalog folder from its current location in the first window to its new location in the second window.
- Holding down the Alt or Option key, open Lightroom. Now, in the dialog box click on the Change button next to the catalog location, and navigate to the .lrcat file within the Lightroom Catalog folder in its new location. Click on it once to select it, and hit OK.
- Lightroom will open, recognizing the new location of your catalog.
PS: Note that if you want to delete a catalog, just delete the Lightroom Catalog folder.