Renamed hard drive LR CC

i set backup system have 2 backup drives , renamed drive of pictures on "seagate backup plus drive" (the generic name) "seagate backup 1 - black". downloaded pictures took today it. lr can't find 9,000+ older pictures on drive because has been renamed. older photos showing in library, folders greyed out.

 

i have read forum looking answer , none seems cover situation. because lr can't 'see' newly named drive can't use previous suggestions such "update folder location" because folders greyed out. when click "find missing folder" message "the selected folder or 1 of subfolders in lightroom. want combine these folders?" , asks me cancel or "merge". i'm little scared merge maybe screw , hopelessly lost.

 

any suggestions? help.

when click "find missing folder" message "the selected folder or 1 of subfolders in lightroom. want combine these folders?" , asks me cancel or "merge".

make backup copy of catalog file before anything.

 

use "find missing folder". click on merge.

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