Answer by Gordon Davisson for lsof reports no files open on external volume...
If you run lsof without sudo, it can only see what files your processes have open, not those open by system or other users. Use sudo lsof | grep /Volumes/LaCie to get a better idea what's going on.
View Articlelsof reports no files open on external volume but it still cannot be safely...
I've searched around here on SX and other places but have not found an approach that gives me any traction on my issue. I've a volume (used by Time Machine as it happens) on an external Firewire drive....
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