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  1. #1
    jltech is offline Registered User
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    Unhappy The following disk images couldn't be opened

    Hi

    I just bought Mountain Lion from the Mac App Store. I need to make a backup USB. But when I try to open InstallESD.dmg, it says "The following disc images couldnt be opened
    Install ESD.dmg Not recognized.

    Could anyone help me? Any help would be appreciated!

    Thanks

  2. #2
    jltech is offline Registered User
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    I'm sure someone is out there to help me

  3. #3
    Satcomer's Avatar
    Satcomer is offline In Geostationary Orbit
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    What Mac are you running?
    Mac Pro Dual 2.8 Quad (2nd gen), 14G Ram, Two DVD-RW Drives, OS X 10.9.1
    2006 Mac Book Pro 2.16 (first Gen) OS X 10.7.5
    2TB Time Capsule, 2 TB
    32G iPhone 4S Black, iPad (3rd Gen) 32G Black

  4. #4
    DeltaMac is online now Tech
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    Why do you need to open the InstallESD.dmg?

    Just drag that file into your Disk Utility, and you can use the Restore tab to copy the image to a partition. 6GB should be great for the Mountain Lion installer.
    You could also try using one of the apps that make the process easy. Lion Diskmaker works very nicely. I have several 8 GB flash drives, and have a couple dedicated for OS X installers. Lion Diskmaker (LDM) uses those, and erases them properly for best use with the Mountain Lion install. You can get that here: http://www.macupdate.com/app/mac/39701/lion-diskmaker
    LDM will use a dedicated partition on a hard drive, or a USB flash key, or will also burn a DVD, whichever is what you want to do.
    I suggest that burning a DVD is not worth your effort. Lion, and Mountain Lion installers are not optimized for booting from DVDs, and are really slow.
    I think the best choice is an 8 GB flash key. My suggestion is to use a new flash drive just for the installer. You can find those everywhere for less than $10, and I have seen some for less than $6 ...

    If that utility also doesn't like your Mountain Lion download - try restarting your Mac into Safe Boot mode (restart holding the Shift key), and try the same copy again.
    If you still get the same error - then delete that download - it's likely just corrupted - and download again. You've already purchased the Mountain Lion install, so Apple doesn't charge you again.
    Serendipity is a lucky guess !

  5. The Following User Says Thank You to DeltaMac For This Useful Post:

    jltech (February 17th, 2013)

  6. #5
    jltech is offline Registered User
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    Quote Originally Posted by Satcomer View Post
    What Mac are you running?
    Mac OS X Mountain Lion

  7. #6
    jltech is offline Registered User
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    Quote Originally Posted by DeltaMac View Post
    Why do you need to open the InstallESD.dmg?

    Just drag that file into your Disk Utility, and you can use the Restore tab to copy the image to a partition. 6GB should be great for the Mountain Lion installer.
    You could also try using one of the apps that make the process easy. Lion Diskmaker works very nicely. I have several 8 GB flash drives, and have a couple dedicated for OS X installers. Lion Diskmaker (LDM) uses those, and erases them properly for best use with the Mountain Lion install. You can get that here: http://www.macupdate.com/app/mac/39701/lion-diskmaker
    LDM will use a dedicated partition on a hard drive, or a USB flash key, or will also burn a DVD, whichever is what you want to do.
    I suggest that burning a DVD is not worth your effort. Lion, and Mountain Lion installers are not optimized for booting from DVDs, and are really slow.
    I think the best choice is an 8 GB flash key. My suggestion is to use a new flash drive just for the installer. You can find those everywhere for less than $10, and I have seen some for less than $6 ...

    If that utility also doesn't like your Mountain Lion download - try restarting your Mac into Safe Boot mode (restart holding the Shift key), and try the same copy again.
    If you still get the same error - then delete that download - it's likely just corrupted - and download again. You've already purchased the Mountain Lion install, so Apple doesn't charge you again.
    Thanks for your help. I will try it later.

    I need it to make a USB backup for my OS, but I need the specific ISO because I would like to boot from CDs. (I have no USB in house)

  8. #7
    DeltaMac is online now Tech
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    You said that you want to make a USB backup, but then you say that you don't have USB.

    Your Mac has USB ports.
    Are you saying that your USB ports are not working at all?

    I also said that you can easily do this (make a backup) to a USB flash drive - which is what you can use for booting to the installer, on the flash drive. You need an 8 GB flash drive, which is easy to find, and low cost (less than $10)
    AND - the flash drive will be much more reliable than booting to a DVD - faster, too!

    Download the Lion Diskmaker that I mentioned. It's very easy to use, and works perfectly.
    Serendipity is a lucky guess !

 

 

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