Thanks everyone for the responses and suggestions. I may not have phrased my question initially the best way but what I've learned is: Multiple HD's are no problem in LR. As you fill them up, just keep adding them, and all images will be in one catalog, even though they can be on different HD's, internal, or multiple external drives. The mess I was in was actually that my 1T drive was totally full, which is a bad situation. I wanted to remove the last 10% or so of images to leave some space on the HD (as I've always heard that it's a bad idea to completely max out a HD), put those images in a new HD, and use that HD going forward for all new images added... It is possible to just drag and drop the folders from the old to new HD, within Lightroom, but that seems to be a risky way to do it. As Lightroom moves the files it deletes them from the old location as it adds them to the new location. If anything goes wrong in this process, they're gone for good (and they're not in the system trash). It's also extremely slow to use this method. What I did was (thanks dj_paige !) in the system finder, copy the folder to the new HD. Open Lightroom and go to the original folder, control+click on the folder icon to get the drop down menu with "Update Folder Location". Now Lightroom will access those files from the new location and the old folder will be removed from Lightroom (but it's still on the system, untouched). As everything looked good in the new location, I went into the system finder and deleted the folder at the old location. In the end not so laborious because I had a folder named "2016" with about 50 subfolders inside (aprox 80gb of images); I was able to move the "2016" folder and with one click (Update Folder Location) Lightroom knew where all the subfolders and images were... Thanks again to everyone for your help, much appreciated! Alan.
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