Cannot eject DMG images in Finder

I seem to be having this problem whereby I cannot seem to eject any DMG images via Finder. I can only eject them using the Disk Utility.
When click the eject button in Finder, nothing happens.
Anyone facing this problem?

Yep, this has been happening to me as well. Stubborn nagging mounted disk images (all of them) won't eject under any circumstances, unless I log out, reboot, or relaunch the finder. Actual mounted disks often seem to need to be ejected twice before they will go away...
-=-Ron-=
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-=-Ron Evry-=-
Creator of 'Mister Ron's Basement' Podcast on iTunes
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Hello. My MacBook Pro has OSX Lion on it.
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Thanks for the fast answer. Excuse my question but are you certain of this? This would be a big job because I would have to:
1. Find another external hard disk. Most probably it will be NTFS formatted because this and FAT32 are the most common formats out there.
2. Find another apple computer to transfer the image to the other hard disk
3. Format my external hard disk as a HFS disk
4. Transfer the DMG image back to the HFS hard disk.
5. After this reformat my external hard disk as NTFS because I live in an hybrid world where PCs and Macs coexist and NTFS is a good bet for compatibility.
If you indeed are certain that that is the correct answer to this situation then I will move into it immediately.
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Hi,
Since I have upgraded my Macbook pro to Yosemite I have experienced several issues each time I have install/upgrade an application (.app file) from an dmg file.
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I'm having the same problem. I don't have any answers. But here's some information about what I'm seeing that might help someone sort this out.
I recently upgraded to Mavericks
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Hi guys,
So I've got a problem with restoring the image backup I did (using Disk Utility) of my 500GB HD on my MBP which was acting weird or maybe even crashed a few months ago. After creating the backup image and putting it on my external device, I installed Mavericks back to see if everything was alright (mainly the HD) and everything seems okay.
I did try restoring the backup image through disk utility before installing mavericks (thus erasing everything again on the HD) AND after. But nothing..
The whole process starts fine and then it starts scanning the image when after maybe a good 10-15min in I get a message that says that it was unable to scan the image. I tried verifying the disk(s), everything came out "OK". Also tried scanning it through Images > Scan image for Restore... with the same results.
While searching I've seen people getting messages like "Unable to scan filename.dmg (Invalid argument)" and "Unable to scan filename.dmg
(Internal error)" but none have (Input/output error)
The screen grab is below.
I also came across something about using terminal/commands but I'm not that savvy with it, especially considering that those there had issues with either mounting or trouble finding the image.
I've also tried moving the backup image to a different external device 2TB and also the desktop because I read it may have to do with the format of the externals or maybe free space. But THEN I would get a message saying
"The Finder can't complete the operation because some data in "Mac HD Backup.dmg" can't be read or written. Error code -36"
Fyi ALL my externals are HFS+/Journaled and the backup image format was compressed.
I REALLY don't know what to do next. Was it the wrong move to create a dmg image? Have I lost everything? Is there still a way out?
If anyone can help, THANKS!
2012 MacBook Pro, Mac OS X (10.9.3)

Make a "Genius" appointment at an Apple Store, or go to another authorized service provider. You may have to leave the machine there for several days.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional—ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
Apple also recommends that you deauthorize a device in the iTunes Store before having it serviced.
*An SSD doesn't need to be zeroed.

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My computer is almost full and I have removed several thousand images from iPhoto to an external hard drive. However, my computer still shows that most of my space is taken up by image files. When I open Finder, the images section shows I have over 17,000 (most are RAW format) images on my Mac. I have done a little research and most of what I read says you cannot erase those images without corrupting iPhoto. I just don't know what else to do. Anyone else have this issue?

You need to move your iPhoto library to a hardwired external disk that is formatted Mac OS extended (journaled) - quit iPhoto and drag the iPhoto library to the EHD, launch iPhoto while holding down the option key until the select library window appears and select the new location - once it is fully tested you can delete the old library test one more time before emptying the trash)
LN

Cannot move some images in iPhoto to desktop

I cannot move an image from iPhoto to my desktop. Also, when I click on the image in iPhoto to enlarge it, I get an exclamation point. When the image is small size in iphoto, I can see it. But if I click on it to enlarge it in iphoto, I get the exclamation point. Don't know why this is happening? I have Iphoto 09, version 8.1.2 (424) My goal: Be able to move any image in iphoto to my desktop and not get the exclamation point anymore.
Message was edited by: rjduffy61

The ! turns up when iPhoto loses the link to the original image - and that's why you can move it to the desktop.
Option 1
Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild. Choose to Repair Database. If that doesn't help, then try again, this time using Rebuild Database.
If that fails:
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Download iPhoto Library Manager and use its rebuild function. (In early versions of Library Manager it's the File -> Rebuild command. In later versions it's under the Library menu.)
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Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one.
Regards
TD

Cannot eject DMG images in Finder

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