Lightroom displays the same hard drive twice

After backing up your catalog, relaunch Lightroom.

Connect the hard drive (MyBook) that is repeating twice.  

In the Folders panel (Library module), click to expand both the instances of MyBook. 

After expanding both the drives, make a note of all the top-level/parents folders appearing under each drive.  

Without disconnecting the Mybook drive, connect another hard drive (Temp) with your computer.

Using the File Explorer (Win) or Finder (Mac), navigate to Temp hard drive folder on your computer.

In Temp hard drive, create new empty folders corresponding to each of the top-level/parent folders that you noted in Step 3.

For example:

• If there five top-level/parent folders appearing under the first instance of Mybook in Lightroom, create five new empty folders in Temp hard drive. You can name them as Fred1, Fred2, ..., Fred5.
  
  
• Similarly, if there five top-level/parent folders appearing under the second instance of Mybook in Lightroom, create five new empty folders in Temp hard drive. You can name them as Mary1, Mary2, ..., Mary5.
  

Now, go back to the Folders panel in Lightroom.

Under the first instance of Mybook, do the following for each of the top-level/parent folder:

1. Right-click (Win) or Control-click (Mac) a top-level/parent folder and select Update Folder Location from the context menu.  
   
2. In the dialog box that appears, navigate to Temp hard drive location and choose a corresponding Fred folder that you created in Step 5.

Similarly, under the second instance of Mybook, do the following for each of the top-level/parent folder:

1. Right-click (Win) or Control-click (Mac) a top-level/parent folder and select Update Folder Location from the context menu.
2. In the dialog box that appears, navigate to Temp hard drive location and choose a corresponding Mary folder that you created in Step 5.
   

Now, update the location of each of the Fred and Mary folders appearing under Temp hard drive to their original folder locations in MyBook drive.

Under Temp drive in the Folders panel, do the following for each of the Fred and Mary folders:

1. Right-click (Win) or Control-click (Mac) the folder and select Update Folder Location from the context menu.  
   
2. In the dialog box that appears, navigate to MyBook hard drive location and choose the original folder (noted in Step 3) corresponding to the Fred/Mary folder.