Currently Being ModeratedAug 8, 2012 1:44 PM (in response to glenmac45)
Looks like the drive is being indexed by Spotlight. If you don't want that drive indexed open the Spotlight pane in System Prefs and add the drive to the Privacy tab. That will stop the indexing and you can eject.
Best of Luck
Currently Being ModeratedAug 8, 2012 3:57 PM (in response to Knucklesmac)
Very many thanks for that - it did work eventually - I think!
The reservation is only because it didn't work first time. Having noted the disk on the privacy page, the first attempt brought up the old message, so I did a re-boot, disconnecting the external disk at the appropriate moment. When everything was back up again I reconnected the external disk, Privacy remembered it, and I was able to make a clean eject.
What is curious is why it is happening in Mountain Lion. I have connected and disconnected this disk dozens of times in the past without any problem.
As the problem also affects my other disks I am going to have to use this approach on them all which is tedious. And I have to hope it does work on them rather than being a co-incidence.
This is not a good example of Apple's "It just works".
Currently Being ModeratedDec 26, 2012 10:25 AM (in response to glenmac45)
This does not work for me. All of my external drives will not eject. Eject works fine with Snow Leopard and Lion using the same external drives. Can't find anything in Activity Monitor or applications accessing the drives. Seems to me Mountain Lion is full of bugs. I am using 10.8.2. Anyone have any idea what in Mountain Lion is accessing these drives all the time. Spotlight is not accessing the drives as they are set up in Spotlight not to access them. With mountain lion I can't even run the combo updater again to fix any problems. Wish I could go back to Lion.
Currently Being ModeratedDec 26, 2012 1:21 PM (in response to Steven Forwood)
Currently Being ModeratedJan 9, 2013 7:17 PM (in response to glenmac45)
I had the same problem -- never an issue ejecting this drive in Lion, but once I made the jump to Mountain Lion, the drive seemed to be in a perpetual state of indexing. As suggested above, I booted into Safe Mode and was able to eject the drive with no problem. But before ejecting the drive, I added it to the privacy tab in Spotlight (so that indexing would not commence once I rebooted). This worked, and I am now able to mount and unmount the drive without any issues.
Currently Being ModeratedJan 10, 2013 2:09 PM (in response to JohnMantooth)
Thanks for your suggestions. I have already tried everything you mentioned in the months since I have been using Mountain Lion. The drives (USB 3.0 and firewire connected via Thunderbolt) will eject fine in Safe Mode but not after rebooting. They also all eject properly on my computers running Lion and Snow Leopard. I have long ago completely turned off Spotlight completely and added the drives to the Privacy area. The only way I can eject any of these drives is to shut down the computer or Force Eject - which is not a good idea. Thanks anyway. I know it has something to do with Apples implementation of usb 3.0 and firewire via thunderbolt, but so far I have not figured it out.Thanks anyway.
Currently Being ModeratedFeb 25, 2013 11:46 AM (in response to glenmac45)
Finally solved the problems of external drives not ejecting. Get an application called LaunchControl. This app solved this problem I have had for months. The app showed me that a Steam launchagent was looking for a game on those drives for some kind of clean up process. I removed references to those drives in the Steam launchagent and all my drives now eject properly. This was not a problem with the system after all. LaunchControl is a very good application, I highly recommend it if you want a closer look at your launchagents and deamons.