Since these are "multi-gigabyte" files, the first thing that comes to mind is how much available drive space you have ???
To locate this information, open any Finder window. Free space will be noted at the bottom of the pane. Rule of thumb... never allow the available drive space to fall below 15%.
That "could" be why your .dmg files won't open... Also, to get information on those .dmg files, select a file then click Command + I. A window will open. Where it says: Open with: click the Pop Up menu button. Make sure it says:
DiskImageMounter or Disk Utility. That window will also indicate the size/date created and when it may have been modified.
I'm having the same problem but I didn't encrypt the file.
When I try to mount the file it keeps saying "Backup.dmg - Not recognized".
Having not enough free space can't be the problem, out of 400GB I have 280GB free, the file is only 6.6GB.
Trying to restore using DiskUtility doens't work, the program won't run a check or repair.
Hey there i have this exact same proble. im using a brang new macbook 2ghz. this is with more than just one file. i have backups of many different things and none of them work.
please help with this
Hello. When I try to open my disk utility I get "the application disk utility has unexpectedly quit". I've tried fsck, repair permissions from terminal, booting in safe mode but nothing seems to work. I couldn't even upgrade from panther to tiger because the install disk wont open. Since everything else seems unaffected I still suspect its a local problem. Can anyone help me, please? Below is the full crash log report. Thanks.
Hello. Has anyone found a solution to the same problem I'm facing? The system doesn't recognize downloaded dmg files when double-clicking them. I tried to repair them in Disk Utilities, even verification doesn't work.
Hello. Has anyone found a solution to the same problem I'm facing? The system doesn't recognize downloaded dmg files when double-clicking them. I tried to repair them in Disk Utilities, even verification doesn't work.
I was using Firefox to download the dmg files. The problem got solved as I used Safari, the files got open easily. The following note helped me out.
StuffIt Expander & the .dmg File Type
The file type we use to deliver StuffIt Expander for Mac is Apple's Macintosh OS X Disk Copy Disk Image File (.dmg).
If you see binary code in the browser window instead of the file downloading to your system, you are most likely using a browser that doesn't recognize this file format and it's trying to show you the file as a web page.
You can use Safari or Internet Explorer to attempt the download again or teach the browser you do use about the .dmg file type.
Here is how to tell Firefox to mount a .dmg file on a Mac
1) Click here to go to Mozilla and click on the green Download Firefox button. This may sound odd, but it's a must. This set of instructions will only work on this dmg for reasons that are probably hard to explain. Trust me here.
2) A window will pop up asking you what you want to do with this DMG. Click the 'Choose...' button.
3) Navigate to your-harddrive/system/library/CoreServices/ and choose DiskImageMounter
4) Click the 'Do this automatically...' check box to save the setting.
5) Hit OK. If you don't actually want to download Firefox again, just cancel the download.
That's it. All .dmg files should now open automatically.
Troubleshooting
If that doesn't seem to work right, then go to Firefox -> Preferences -> Downloads and click on the 'View & Edit Actions' button. Look for DMG, click on it, click 'Change Action...' and choose 'Open them with this application' and browse to DiskImageMounter again. This will clear up any confusion within Firefox but you must perform the steps above first or else you can't even get DMG into the list
still have no answer to this. i have a hunch that storing them on an airport disk somehow corrupted them, but i hope not. if anyone knows how to rescue DMG files that won't open or won't appear as corrupt, please help!
