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WhyNotUnmount is a tool that explains why unmounting a certain external volume is not possible. Usually this is because files on the volume remain opened by an application. WhyNotUnmount checks which application blocks your volumes from being unmounted properly.

What's New

Version 0.3 improves user interface and stability.


Mac OS X 10.4.11 or later

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WhyNotUnmount User Discussion

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Zeebie Member IconComment+71

Does not work. Doesn't do anything except showing a network icon.

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Version 0.3
Dana Sutton Member IconComment+669
Dana Sutton

I agree with Driezhas. It's not all that useful to know why a volume refuses to unmount (or why, for that matter if you're unable to do anything about it. On the other hand, a utility that would be a real boon.

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Version 0.3
Shane-Smith Member IconComment+273

I think this is a great little application and much needed. This should be part of the system as default, which brings me to my suggestion... make it a preference pane which runs in the background.

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Version 0.3
Dom21 Member IconComment+58

There is a definite need for this program. I just discovered it on MU today and, of course, won't know when I'll have the occasion to try it out. But just wanted to comment "kudos" to the dev for creating this app.

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Version 0.3
Agasupport (Developer) Member IconDev+14
Agasupport (Developer)

Hi! I like your apps interface design. I write the WhatsOpen app and was wondering if you'd be interested in collaborating efforts? The simplistic interface you've used is a wonderful way of presenting a summary of devices. I'd be interested in using it to frontend WhatsOpen as a more straight forward way of displaying information while continuing to use the more expanded view for further system information.

You can contact me at agathezol@agasupport.com.

Thank you,


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Version 0.2
Kristijonas Member IconReview+6

Hey - great app! There are some situations that unmount is impossible even if I think that all docs and apps are closed, looking in Terminals window takes time and sometimes it doesn't give any results. So, I give You 5 stars in advance with hope, You'll add "Force Unmount" button! :-)

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Version 0.2
There are no Ratings for this App yet.
> 5 1


Current Version (0.x)


Downloads 3,213
Version Downloads 2,455
Type Utilities / System
License Free
Date 18 Dec 2008
Platform OS X / PPC 32 / Intel 32
Price Free
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