Hi William,
I've tried both suggestions but no success. Due to my inexperience with the intricacies of command strings I believe I'm more than likely entering the wrong command string. My external hard drive is labelled as Seagate Backup Plus Drive 1TB. Below is a copy of the various attempts to enter a command string. Can you suggest the correct string please? My wife has labelled the iMac as Judy Hunts iMac and my name is Dave.
Judy-Hunts-iMac:~ Dave$ mdutil -s /Volumes/Seagate Backup Plus Drive1TB \ HD /: Indexing enabled.
Error: invalid path `/Volumes/Seagate'.
Error: invalid path `Backup'.
Error: invalid path `Plus'.
Error: invalid path `Drive1TB'.
Error: invalid path ` HD'.
Error: invalid path `/:'.
Error: invalid path `Indexing'.
Error: invalid path `enabled.'.
Judy-Hunts-iMac:~ Dave$ Dave$ mdutil -s /Volumes/Seagate Backup Plus Drive1TB/:
-bash: Dave$: command not found
Judy-Hunts-iMac:~ Dave$ mdutil -s /Volumes/Seagate Backup Plus Drive1TB/:
Error: invalid path `/Volumes/Seagate'.
Error: invalid path `Backup'.
Error: invalid path `Plus'.
Error: invalid path `Drive1TB/:'.
Judy-Hunts-iMac:~ Dave$ -mdutil -s /Volumes/Seagate Backup Plus Drive 1TB/:Indexing Enabled
-bash: -mdutil: command not found
Judy-Hunts-iMac:~ Dave$ mdutil -s /Volumes/Seagate Backup Plus Drive1TB \ HD /: Indexing enabled.
Error: invalid path `/Volumes/Seagate'.
Error: invalid path `Backup'.
Error: invalid path `Plus'.
Error: invalid path `Drive1TB'.
Error: invalid path ` HD'.
Error: invalid path `/:'.
Error: invalid path `Indexing'.
Error: invalid path `enabled.'.
Judy-Hunts-iMac:~ Dave$ mdutil -s /Volumes/Seagate Backup Plus Drive1TB\ /:
Error: invalid path `/Volumes/Seagate'.
Error: invalid path `Backup'.
Error: invalid path `Plus'.
Error: invalid path `Drive1TB /:'.
Judy-Hunts-iMac:~ Dave$