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  1. #1

    Member Since
    Feb 05, 2012
    How do I reduce the size of a dmg disk?
    I created a dmg with disk utility with the capacity of 44GB to store files a while back but now i've started deleting files and I would like to reduce the size of the disk. Is there a way I can do this?

  2. #2

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac, i7 4GHz, 32GB memory, 1TB PCI-e storgae StOS X.13.3
    Do you mean you created a 44GB partition on your hard drive?

    Disk Utility will do this but there is always a chance the partition may be erased. Suggest making a clone on an external drive and then you can change the partition size and copy files back of necessary.
    Last edited by harryb2448; 05-04-2014 at 07:31 PM.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  3. #3

    TattooedMac's Avatar
    Member Since
    May 19, 2009
    Waiting for a mate . . .
    21" iMac 2.9Ghz 16GB RAM - 10.11.3, iPhone6s & iPad Air 2 - iOS 9.2.1, ATV 4Th Gen tvOS, ATV3
    No the .dmg will stay the same size as you delete files from it. What you need to do is to make a new .dmg with the files you have left and delete the 44GB .dmg.
    Dont forget to use the Reputation System if someone has helped you out !!!
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  4. #4

    Slydude's Avatar
    Member Since
    Nov 15, 2009
    North Louisiana, USA
    2.8 GHz 2008 MacBook Pro 10.11, 8 GB mem, iPhone 8+, 2015 iMac 16 GB 10.13 beta
    Have you considered using a sparse bundle. When the file is created a limit is set and the size of the file can fluctuate up to that limit.

    How to create a dynamically resizable disk image in OS X - CNET
    Did you know these forums are soon to be shut down?
    Long story here. Short storyhere

  5. #5

    Member Since
    Feb 05, 2012
    thanks for the replies, i'll try and make a new disk with sparse bundle

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