9 Replies Latest reply: Jan 9, 2008 9:37 PM by Nicolas diPierro
Nicolas diPierro Level 1 (100 points)
ok so i used dmg files to back up my data from years past.

i'm now unable to open these multi-gigabyte files at all. disk image mounter, disk utility say "unable to attach "mybackup.dmg" - not recognized.

how can i get my data out of these backups?

i think i may have encrypted them with a password... i know the password but these dmg files no longer display the padlock icon.

PowerBook G4 Aluminum, Mac OS X (10.4.10)
  • Carolyn Samit Level 10 (103,365 points)
    Hi Nicolas,

    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.

    Hope this helps...

  • Jelle586 Level 1 (0 points)

    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.

    What can I try to get back my files?
  • PretaxBump Level 1 (0 points)
    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
  • mrperipheral Level 1 (0 points)
    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.

    Date/Time: 2007-10-24 03:57:12 +1000
    OS Version: 10.3.9 (Build 7W98)
    Report Version: 2

    Command: Disk Utility
    Path: /Applications/Utilities/Disk Utility.app/Contents/MacOS/Disk Utility
    Version: 10.4.4 (145.7)
    PID: 367
    Thread: 0

    Exception: EXCBADACCESS (0x0001)
    Codes: KERNPROTECTIONFAILURE (0x0002) at 0x00000018

    Thread 0 Crashed:
    0 com.apple.CoreFoundation 0x901fcba4 _CFBundleGetLanguageSearchList + 0x18
    1 com.apple.CoreFoundation 0x901ea8d8 CFBundleCopyResourceURL + 0x2c
    2 DiskImages 0x942752c8 DIHLGetDefaultsDictionary + 0x50
    3 DiskImages 0x94276414 DIHLCopyPreference + 0x34
    4 DiskImages 0x9427295c DIInitialize + 0x8c
    5 com.apple.DiskUtility 0x0000c5d8 0x1000 + 0xb5d8
    6 com.apple.AppKit 0x92f6b820 -[NSCustomObject nibInstantiate] + 0x10c
    7 com.apple.AppKit 0x92e9a9c0 -[NSIBObjectData instantiateObject:] + 0xbc
    8 com.apple.AppKit 0x92ea19ec -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 0x88
    9 com.apple.AppKit 0x92f937b0 loadNib + 0xfc
    10 com.apple.AppKit 0x92eea990 +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 0x2e8
    11 com.apple.AppKit 0x92f698a0 +[NSBundle(NSNibLoading) loadNibFile:externalNameTable:withZone:] + 0x9c
    12 com.apple.AppKit 0x92f7b0a0 +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 0x174
    13 com.apple.AppKit 0x92f69708 NSApplicationMain + 0x174
    14 com.apple.DiskUtility 0x0000c420 0x1000 + 0xb420
    15 com.apple.DiskUtility 0x000143f4 0x1000 + 0x133f4

    PPC Thread State:
    srr0: 0x901fcba4 srr1: 0x0200f030 vrsave: 0x00000000
    cr: 0x44000422 xer: 0x00000007 lr: 0x901fcb9c ctr: 0x901ea8ac
    r0: 0x901ea8d8 r1: 0xbffff780 r2: 0xa00016b4 r3: 0x00000000
    r4: 0xa427afe0 r5: 0xa427aff0 r6: 0x00000000 r7: 0x0000001f
    r8: 0xa01c0dcc r9: 0x497f0f9f r10: 0x0000001d r11: 0xa4270820
    r12: 0x901ea8ac r13: 0x00000000 r14: 0x00000000 r15: 0x00000000
    r16: 0x00334b50 r17: 0xa2eaa6a8 r18: 0xa2e9a6a8 r19: 0xa2eaa6a8
    r20: 0xa2eaa6a8 r21: 0x00000000 r22: 0xa2ea1964 r23: 0xa2eacda0
    r24: 0xa2eab7e0 r25: 0xa427afe0 r26: 0x00000000 r27: 0xa427aff0
    r28: 0x00000000 r29: 0xa4274810 r30: 0x00000000 r31: 0x901fcb9c

    Binary Images Description:
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  • Kreative Level 1 (0 points)
    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.
  • Kreative Level 1 (0 points)
    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.
  • Kreative Level 1 (0 points)
    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.
    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
  • Tim Kline1 Level 1 (10 points)
    Thanks, Kreative. I had the same issue, and your posting fixed it for me. Thanks!
  • Nicolas diPierro Level 1 (100 points)
    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!