I have a 1 TB Passport for Mac, used with OS 10.9.4 and SuperDuper!.
When I try to back up I get the message “Failed to enable ownership on EMB Passport.”
If I try to eject the drive, I get a message that it is in use.
When I “Force Eject” it, disconnect it, and reconnect it, the drive IS recognized and I can proceed with backup.
How can I “enable ownership”? My previous Passport did not have this problem.