The letter of the drive where LR4 catalog and its raw images reside had to be changed. How can I modify or recreate tthe Lrcat file to accomodate this change?
The Lrcat file works fine under the new drive letter name, however it still points to the previous drive letter when it references raw image + XMP files. Is there a simple way to solve this proplem? Were dealing with over 100,000 image files.
When an entire folder of photos is missing — the folder is dim in the Folders panel and has a question mark icon () — you can relink all the photos at once by right-clicking (Windows) or Control-clicking (Mac OS) on the folder and choosing Find Missing Folder from the context menu.
If you have your Lightroom library organized in subfolders under one main top level folder, you only need to do this operation one time. This is the compelling reason to have your photos organized into one top level folder hierarchy.
See the section on "Locate Missing Folders" on this page: