Lightroom catalog on external hard drive not readable Using Lightroom 4, when opening a catalog file on an external hard drive, I get error


  Lightroom cannot launch with this catalog. It is either on a network volume or on a volume on which Lightroom cannot save changes.


As is suggested on the Adobe forums, the external hard drive is NTFS which is not compatible with my MacBook Pro.

Is there anything I could install on my computer so that the catalog is usable?
You could download a NTFS driver to read the catalog. 

Saw this driver on a first search. 

If you want an alternative is to have a friend who has a windows box copy the contents out and then copy it to a drive with the correct format that you can read. I would believe this to be FAT32.