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10.6: Be careful ejecting disk images with installers System 10.6
If you are running an installer on a disk image, and you try to eject the disk image, it will tell you that there is an application using the disk image if the installer is currently installing.

But if the installer has not gotten to the installing phase, or if it is waiting for another installer to finish, Mac OS X will let you eject the disk image. Then, when you get to the installing phase, it will fail.

I had always been in the habit of ejecting installer disk images and then, if the installer was running, the system would warn me and I would then know, but it seems that in Snow Leopard that you need to be more careful.
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10.6: Be careful ejecting disk images with installers
Authored by: asmeurer on Sep 15, '09 07:51:56AM

Wow. The hint's queue must be huge. I submitted this hint almost right after Snow Leopard came out, and I figured that it was just lost, especially after iTunes 9 hints came out right after that release.



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10.6: Be careful ejecting disk images with installers
Authored by: TvE on Sep 15, '09 12:43:47PM

Why try to eject the image you're installing from DURING the installation, I cannot figure out when one would do such a weird action



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10.6: Be careful ejecting disk images with installers
Authored by: UberFu on Sep 15, '09 02:15:06PM

I agree.

Is someone's short-term memory that bad - when they goto try and eject a DMG at some point after they just started an install?

Does Not Make Sense.

Leave mounted DMGs alone just like if it were a Disc or mounted HD with something running - until it stops/ quits/ or ends.



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10.6: Be careful ejecting disk images with installers
Authored by: asmeurer on Sep 15, '09 04:43:19PM

Well, I am sure that I am not the only person who takes advantage of the fact the Mac OS X will not let you eject a disk or disk image if a file on it is open. If you don't want the disk image anymore, you can just try to eject the image and see if it works. If it does, then you are fine, otherwise, you know that you have something open on it.

This actually happened to me right after upgrading to Snow Leopard. I installed the new developer tools, which took a few hours. Installer will only install one package at a time, so some other update that I was installing was just sitting in the background waiting to finish. I actually had two or three other installers running, because I was updating several things to Snow Leopard compatibility, all of which were on disk images. I suppose I could have switched to Installer to see which ones were done, but normally this would be a waste of time because Mac OS X would just not eject the disk images in use anyway. This hint is to note that this sort of thing doesn't work in Snow Leopard.



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10.6: Be careful ejecting disk images with installers
Authored by: Felix on Sep 16, '09 12:41:30AM

@asmeurer "Well, I am sure that I am not the only person who takes advantage of the fact the Mac OS X will not let you eject a disk or disk image if a file on it is open."

No, actually I think you are the only person I've ever heard of who takes 'advantage' of this Apple OS characteristic. Most people don't drag installer disk images to the trash can to determine if it's still running!



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10.6: Be careful ejecting disk images with installers
Authored by: asmeurer on Sep 16, '09 08:40:55AM

I'm not dragging it to the trash to determine if it is still running. I am just ejecting it without going through the steps first to make sure that everything on it is closed, as Mac OS X will not let me do it if something is open anyway.



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10.6: Be careful ejecting disk images with installers
Authored by: bitwise on Sep 15, '09 05:06:18PM

Several installers running at the same time...
Trying to eject disk images with running installers...
You've got me smiling.
You should consider working in a QA lab (;



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