Results 1 to 5 of 5
  1. #1
    Corrupted DMG files on external drive...

    Member Since
    Mar 24, 2008
    Posts
    97
    Specs:
    Macbook Pro 13" 2.26 GHz 320GB 4GB Ram, iMac 2006, 250GB 2GB RAM & 3G iPhone
    Corrupted DMG files on external drive...
    Hi

    I have an external drive where I store loads of stuff, one of the things I store there is lots of apps, some of which I can get again. However, there are a few that will be hard to get again and I also had some really good NFR software there I want to use. It all worked at one point, but now if I try and mount a DMG file it says "image data corrupted unable to mount disc" (or something).

    Is there anyway to recover these dmg files? I have no idea what could have happened to the data on my external drive, I don't remember the drive being dropped or anything. If I drag a new dmg file to the drive and then try it, it works.

    I tried checking the disc in the disc the utilities and running a repair, that doesn't help.

    Thanks for any help.

  2. #2
    Corrupted DMG files on external drive...
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    45,262
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    It sounds like that external drive has problems. Use Disk Utility to check the drive. Mount the drive, open DU, click on the First Aid tab and do a verify and repair. If the drive shows a lot of errors, don't use it any more as it's probably getting ready to die.

    Just a suggestion: If you need to archive programs or files, a better way would be to burn them to DVD media. Hard drives fail, even good ones. CD and DVD media are not 100% fool proof either, but they'll outlast a hard drive. I have old files archived on CDs and DVDs from 10 years ago and I can still open them or copy them. I'm a pack rat.

    Regards.

  3. #3
    Corrupted DMG files on external drive...

    Member Since
    Mar 24, 2008
    Posts
    97
    Specs:
    Macbook Pro 13" 2.26 GHz 320GB 4GB Ram, iMac 2006, 250GB 2GB RAM & 3G iPhone
    Thanks for the reply. I tried to do a full repair, it says the disk appears to be fine, it has a Mac area and a windows partition (FAT). The strange thing is all my files that aren't dmg file are perfect, for example I have some websites stored on there, html pages etc and some word documents and some pdfs and they are all fine, the only things that are corrupted are all my dmgs, very strange... So there's no way to recover them? There's nothing to indicate that the disc is dying....

  4. #4
    Corrupted DMG files on external drive...
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    45,262
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    No way to recover a DMG file that I know of. DMG files are compressed which makes recovery more difficult than say a corrupt document. If possible, try to download them again. And yes, it is strange that only the DMG files are corrupt and not the others. I'm wondering if they were somehow damaged when you copied them to the external drive. I have had that happen to me with large image files.

    Regards.

  5. #5
    Corrupted DMG files on external drive...

    Member Since
    Mar 24, 2008
    Posts
    97
    Specs:
    Macbook Pro 13" 2.26 GHz 320GB 4GB Ram, iMac 2006, 250GB 2GB RAM & 3G iPhone
    Maybe that's what happened. Really annoying. I will have to seek out all the apps again, most won't be a problem. Just annoying. I guess the moral of the story is; once uploaded and back up, check your DMG files from the drive to make sure they're working before deleting everything you thought you had saved.....

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Replies: 6
    Last Post: 03-28-2013, 12:19 PM
  2. MacBook backup to external, skip corrupted files?
    By mr_goodbomb in forum Apple Notebooks
    Replies: 16
    Last Post: 03-03-2012, 06:03 PM
  3. Corrupted files on external HD
    By misterpouliot in forum Other Hardware and Peripherals
    Replies: 1
    Last Post: 05-24-2010, 04:24 PM
  4. Replies: 2
    Last Post: 04-24-2010, 12:53 PM
  5. How can I backup DMG file to external drive?
    By nickbrinkman in forum OS X - Operating System
    Replies: 3
    Last Post: 02-28-2009, 04:10 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •