Disk doesn't unmount in Disk Utility

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I periodically run First Aid on my external drives and one drive will not unmount so the procedure fails. But if I press the "unmount" button on the top of Disk Utility the volume unmounts and First Aid is indicted as "Successful". The problem area is the bottom line in the attached file, "OWC 2TB-Photos". Disk Utility can be used without issue on the two higher lines.
My question is, since Disk Utility still seems to indicate that all is ok if I manually unmount the volume, should I just keep going or is this a sign that the disk is failing?

Thanks.

Mark
 

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Is the Photos app open when you attempt DU First Aid on the external?
 
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To follow up on Bob's post, if Photos is running, the drive is in use and should not unmount. Make sure all applications that might be using the drive are fully quit.
 
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Thanks, I tried that and it worked. Funny thing is, I'm 99% sure I did the same the other day and it did not work. Maybe it's intermittent? If so, I'll be back. :)
 
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Thanks, I tried that and it worked. Funny thing is, I'm 99% sure I did the same the other day and it did not work. Maybe it's intermittent? If so, I'll be back. :)
Not intermittent. If the system thinks the drive is in use, it won't allow a regular unmount. Yes, you can "force" it, but it throws up lots of warnings about the havoc that can create.
 

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